From kenw8ek at gmail.com Fri Jan 1 12:30:10 2016 From: kenw8ek at gmail.com (Ken, W8EK) Date: Fri, 1 Jan 2016 12:30:10 -0500 Subject: [AMRadio] Kenwood TL-922 A, HF Amp FS Message-ID: <5686B7A2.9030406@gmail.com> For Sale: NOS Kenwood TL-922 A, HF Amplifier I know that NOS (New, but old stock) is usually used for tubes, but in this case it applies to this amplifier. To the best of my knowledge it has never been used. I was told that it has been in the bedroom closet of a climate controlled house, in its original box, for the last seven years or so. Prior to that, no one can remember seeing it in use. It does not even have any dust, which is something that would happen even with a little use. Although it is apparently new, unused, it is still on the order of 20 years old. Obviously it still has its original filter capacitors which need to be replaced before use. The outer box looks like it probably was moved a few times, which corresponds to what I was told, as the previous owner changed QTHs. I can sell this unit in one of three ways: 1) As it presently is, in its original box, but needing new filter capacitors, for $1000. If you are handy and/or would like to do your own work, this is the best option. Obviously this is the easiest option for me. 2) I replace the filter capacitors and verify it works. Cost would then be $1200. This is the option that I least prefer. 3) I replace not only the filter capacitors, but add a glitch resistor in the B+, protective diodes where needed (primarily in metering circuit and across relay coils), change biasing of the tubes, and add a soft key circuit. Cost would then be $1300. Obviously, I would prefer pickup in the Ocala FL area, very close to I-75. Being that it has its original boxes, I could ship, although it would be costly, which is obviously not included in the above prices. If you have been looking for a really terrific, pristine, mint, TL-922 A, this is it. Due to the many options, it would be best to talk on the phone. (352) 732-8400 Thanks. 73, Ken, W8EK Ken Simpson E-mail to W8EK at FLHam.net or W8EK at arrl.net Voice Phone (352) 732-8400 From paul at paulbaldock.com Sat Jan 2 17:32:10 2016 From: paul at paulbaldock.com (Paul Baldock) Date: Sat, 02 Jan 2016 14:32:10 -0800 Subject: [AMRadio] CQ CQ 10 de KW7Y In-Reply-To: <20151230121919.18123hs5i0po9rmv@webmail.hiwaay.net> References: <567EDB79.5000603@securespeed.us> <248554596.3424588.1451155655630.JavaMail.yahoo@mail.yahoo.com> <20151227210434.63942yiyffso38oy@webmail.hiwaay.net> <018401d14127$918c5c40$b4a514c0$@charter.net> <003a01d141bb$67100d10$35302730$@charter.net> <5683C516.1090805@securespeed.us> <20151230121919.18123hs5i0po9rmv@webmail.hiwaay.net> Message-ID: Listening on 29.000Mhz at 22:31Z - Paul KW7Y --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus From manualman at juno.com Sat Jan 2 17:42:53 2016 From: manualman at juno.com (manualman at juno.com) Date: Sat, 2 Jan 2016 17:42:53 -0500 Subject: [AMRadio] CQ CQ 10 de KW7Y Message-ID: 10 meters is quiet. 6 meters is open up and down the East coast, down to Cuba, and out to TX. 15 meters is wall to wall, coast to coast. Friday night/early Saturday morning to about 3AM EST, 10 meters was open. Lots of Sporadic E over the last several days. Pete, wa2cwa On Sat, 02 Jan 2016 14:32:10 -0800 Paul Baldock writes: > Listening on 29.000Mhz at 22:31Z > > - Paul KW7Y From kenw8ek at gmail.com Sat Jan 2 18:38:14 2016 From: kenw8ek at gmail.com (Ken, W8EK) Date: Sat, 2 Jan 2016 18:38:14 -0500 Subject: [AMRadio] Wattmeters and SWR Bridges FS Message-ID: <56885F66.80704@gmail.com> Wattmeters and SWR Bridges For Sale: MFJ 814 HF Wattmeter / SWR Bridge: The MFJ 814 is listed as an HF Wattmeter and SWR bridge. It reads 200 W or 2000 W both forward and reflected, and also reads SWR. It has a large (about 3 inch) meter that has a back light if 12 Volts is applied. This unit works fine, including the meter light. Cosmetically it is very good. Calibration compares favorably to wattmeter calibrated to NIST standards. Only $45 HF Peak / Average Wattmeter: Radio Shack 21-524 HF Wattmeter with peak or average readings. Full scale power readings of 2000 W, 200 W, and 20 W, with a switch to select either peak or average. Of course it also reads SWR. It is rated for 3 to 30 MHz. This one works fine and looks perfect. I can not find a scratch on it. It appears that it might never have been used, but simply stored in a drawer. Its accuracy compares very favorably to a wattmeter calibrated traceable to NBS. Paper work is included for $40. HF Peak / Average Wattmeter: Radio Shack 21-534 HF Wattmeter with peak or average readings. Full scale power readings of 2000 W, 200 W, and 20 W, with a switch to select either peak or average. Of course it also reads SWR. It is rated for 3 to 30 MHz. This one works fine and looks perfect. I can not find a scratch on it. It is still in its original box, and appears that it might never have been used, but simply stored in a drawer. Its accuracy compares very favorably to a wattmeter calibrated traceable to NBS. Paper work is included for $40. Daiwa CN-540 Cross Needle VHF Wattmeter: The CN-540 is a cross needle meter rated for 50 to 150 MHz. Forward power scales are 200 W and 20 W, with 40 W and 4 W in reverse. Of course since this is a cross needle meter, it also reads SWR simultaneously. This particular meter works fine with average looks. Paper work (which includes the schematic diagram) is included for $35. Vanco SWR-2 SWR Bridge / Wattmeter It covers from 1.7 to 150 MHz. It has a single meter, and is actually a 10 W and 100 W full scale watt meter as well as the "normal" SWR meter. It is still in its original box, with original paper work, and appears to be new. $25. Motorola S-1352A SWR Bridge This unit is an SWR Bridge and a Wattmeter with 10 W and 100 Watt scales. It can also function as a field strength meter. It works fine and looks close to perfect. $25 Royce Model 2-100 SWR Bridge This is what I think of when I think of an HF SWR Bridge. SO-239 connectors on each end, and a meter at one end. It is in good condition, both electrically and cosmetically. $17 Vanco SWR-3 SWR Bridge This HF SWR bridge is relatively small, so would be ideal for mobile or portable use. It works fine and looks fine. $15 Hawk H-3000 SWR Bridge HF SWR Bridge similar to the SWR-3 above. It works fine and looks fine. $15 Homebrew 3 to 150 MHz SWR Bridge: This unit will cover the HF bands (not including 160 meters), and also 2 meters and 6 meters. It is a well constructed homebrew unit measuring about 4 x 4 by 2 1/2 inches (plus knob and connectors). SO-239 connectors are on the side. It works fine and looks fine as well. $12 M C Jones "Micro Match" MM-1: The "Micro Match" is one of the very, very early SWR bridges. It is made by M C Jones Electronics of Bristol, Conn. I do not know the exact vintage, but would guess in the 1940's or 50's. The MM-1 is certainly related to the more common Model 261, 262, and 263 units. Paper work from them is included, since they are similar. This unit has both SO-239 and BNC connectors on each side, in parallel, so that either can be used. A toggle switch is on top (for forward/reflected power), with a range switch on the left, and SWR adjust control on the right, and the meter in the middle. Own this vintage piece of equipment for only $20 plus shipping Prices do not include shipping from Florida. I also have many other accessories available such as many different types of microphones, HTs, HF, VHF and UHF rigs, HF and VHF/UHF antennas, etc. Just too many to list here. Please e-mail your requests. Thanks. 73, Ken, W8EK Ken Simpson E-mail to W8EK at FLHam.net or W8EK at arrl.net Voice Phone (352) 732-8400 From mjcal77 at yahoo.com Sun Jan 3 15:39:24 2016 From: mjcal77 at yahoo.com (CL in NC) Date: Sun, 3 Jan 2016 20:39:24 +0000 (UTC) Subject: [AMRadio] Freezing electrolytics and other stuff References: <1930288073.6384672.1451853564022.JavaMail.yahoo.ref@mail.yahoo.com> Message-ID: <1930288073.6384672.1451853564022.JavaMail.yahoo@mail.yahoo.com> Do to circumstances beyond my control, I am having to relocate my shop to another building. Prior to this move, my shop was attached to the house and had some residual heat getting in that kept it OK, nothing like the temp swings now. Right now I use a kerosene heater when I am out there working, but have been leaving a special type of electric heater on when I am not there when freezing temps are expected. So far, the electric unit keeps the temp around 40 if it's 20 out, but a 8 cents a KWH, it will get pricey fast. The building is insulated, but ran out of money to put siding on it yet, just insulation board and R13 fiberglass. On the chance that power fails and it is zero outside, and other than a long time for tube gear oscillators to stabilize after turn on, what are the effects of freezing temps on things like electrolytics? I've got a couple pieces of higher end test equipment, a comm service monitor and a Tektronix 465M scope, any adverse effects on those? Charlie, W4MEC in NC From rbethman at comcast.net Sun Jan 3 17:11:50 2016 From: rbethman at comcast.net (rbethman) Date: Sun, 3 Jan 2016 17:11:50 -0500 Subject: [AMRadio] Freezing electrolytics and other stuff In-Reply-To: <1930288073.6384672.1451853564022.JavaMail.yahoo@mail.yahoo.com> References: <1930288073.6384672.1451853564022.JavaMail.yahoo.ref@mail.yahoo.com> <1930288073.6384672.1451853564022.JavaMail.yahoo@mail.yahoo.com> Message-ID: <56899CA6.60401@comcast.net> Charlie, Put a few Electrolytic caps in your freezer. after a week or so, take out and test. I'm going to do that myself, and then test to see if issues arise. Regards, Bob On 1/3/2016 3:39 PM, CL in NC via AMRadio wrote: > Do to circumstances beyond my control, I am having to relocate my shop to another building. Prior to this move, my shop was attached to the house and had some residual heat getting in that kept it OK, nothing like the temp swings now. Right now I use a kerosene heater when I am out there working, but have been leaving a special type of electric heater on when I am not there when freezing temps are expected. So far, the electric unit keeps the temp around 40 if it's 20 out, but a 8 cents a KWH, it will get pricey fast. The building is insulated, but ran out of money to put siding on it yet, just insulation board and R13 fiberglass. On the chance that power fails and it is zero outside, and other than a long time for tube gear oscillators to stabilize after turn on, what are the effects of freezing temps on things like electrolytics? I've got a couple pieces of higher end test equipment, a comm service monitor and a Tektronix 465M scope, any adverse effects on those? > > Charlie, W4MEC in NC From w5jo at brightok.net Sun Jan 3 17:45:07 2016 From: w5jo at brightok.net (w5jo at brightok.net) Date: Sun, 3 Jan 2016 16:45:07 -0600 Subject: [AMRadio] Freezing electrolytics and other stuff In-Reply-To: <56899CA6.60401@comcast.net> References: <1930288073.6384672.1451853564022.JavaMail.yahoo.ref@mail.yahoo.com><1930288073.6384672.1451853564022.JavaMail.yahoo@mail.yahoo.com> <56899CA6.60401@comcast.net> Message-ID: <64AB2737EB8B4251B7A16EC1689FDD08@JimPC> Charlie, Check the specifications for the caps you plan to use. Looking at the specifications for aluminum electrolytic caps I see the minimum operating temperature range from -25 to -50 C. I looked at the Mouser site to find those numbers. Give that information I don't think I would be concerned. What is of concern is how old they are. As they age the paste will dry so, if you are using caps that are old I would do a leakage test. A few years back I ordered some Sprague caps to have for stock. They have been stored in a climate controlled atmosphere (read indoors heated and cooled) for about 6 years. I installed some of them in a receiver and in about a year they started leaking. I replaced them with more from stock and the same thing, so I ordered new ones and the problem went away. I can only guess they all came from a bad batch. They were of different values and voltages. I have yet to understand why that happened. Jim W5JO -----Original Message----- Charlie, Put a few Electrolytic caps in your freezer. after a week or so, take out and test. I'm going to do that myself, and then test to see if issues arise. Regards, Bob On 1/3/2016 3:39 PM, CL in NC via AMRadio wrote: > Do to circumstances beyond my control, I am having to relocate my shop to > another building. Prior to this move, my shop was attached to the house > and had some residual heat getting in that kept it OK, nothing like the > temp swings now. Right now I use a kerosene heater when I am out there > working, but have been leaving a special type of electric heater on when I > am not there when freezing temps are expected. So far, the electric unit > keeps the temp around 40 if it's 20 out, but a 8 cents a KWH, it will get > pricey fast. The building is insulated, but ran out of money to put > siding on it yet, just insulation board and R13 fiberglass. On the chance > that power fails and it is zero outside, and other than a long time for > tube gear oscillators to stabilize after turn on, what are the effects of > freezing temps on things like electrolytics? I've got a couple pieces of > higher end test equipment, a comm service monitor and a Tektronix 465M > scope, any adverse effects on those? > > Charlie, W4MEC in NC From w3slk at verizon.net Sun Jan 3 18:18:16 2016 From: w3slk at verizon.net (Mike Sawyer) Date: Sun, 03 Jan 2016 18:18:16 -0500 Subject: [AMRadio] Freezing electrolytics and other stuff In-Reply-To: <64AB2737EB8B4251B7A16EC1689FDD08@JimPC> References: <1930288073.6384672.1451853564022.JavaMail.yahoo.ref@mail.yahoo.com><1930288073.6384672.1451853564022.JavaMail.yahoo@mail.yahoo.com> <56899CA6.60401@comcast.net> <64AB2737EB8B4251B7A16EC1689FDD08@JimPC> Message-ID: <000901d1467d$06f52340$14df69c0$@verizon.net> Charlie, (and others), I had the exact same set up as you. I had a shack with pretty much fiberboard on the outside. I insulated it and I used to run one of those ceramic Polonius heaters, until I got the electric bill! So, I would go out and warm up the ET-4336F until it was a balmy 52?F. I had my Apache, DX-100, and Ranger out there. They suffered no ill effects from the cold. I have them inside today but I never had to do anything with the electrolytics, (or anything else for that matter!). Mod-U-Lator, Mike(y)/W3SLK -----Original Message----- From: AMRadio [mailto:amradio-bounces at mailman.qth.net] On Behalf Of w5jo at brightok.net Sent: Sunday, January 3, 2016 5:45 PM To: amradio at mailman.qth.net; rbethman Subject: Re: [AMRadio] Freezing electrolytics and other stuff Charlie, Check the specifications for the caps you plan to use. Looking at the specifications for aluminum electrolytic caps I see the minimum operating temperature range from -25 to -50 C. I looked at the Mouser site to find those numbers. Give that information I don't think I would be concerned. What is of concern is how old they are. As they age the paste will dry so, if you are using caps that are old I would do a leakage test. A few years back I ordered some Sprague caps to have for stock. They have been stored in a climate controlled atmosphere (read indoors heated and cooled) for about 6 years. I installed some of them in a receiver and in about a year they started leaking. I replaced them with more from stock and the same thing, so I ordered new ones and the problem went away. I can only guess they all came from a bad batch. They were of different values and voltages. I have yet to understand why that happened. Jim W5JO -----Original Message----- Charlie, Put a few Electrolytic caps in your freezer. after a week or so, take out and test. I'm going to do that myself, and then test to see if issues arise. Regards, Bob On 1/3/2016 3:39 PM, CL in NC via AMRadio wrote: > Do to circumstances beyond my control, I am having to relocate my shop > to another building. Prior to this move, my shop was attached to the > house and had some residual heat getting in that kept it OK, nothing > like the temp swings now. Right now I use a kerosene heater when I am > out there working, but have been leaving a special type of electric > heater on when I am not there when freezing temps are expected. So > far, the electric unit keeps the temp around 40 if it's 20 out, but a 8 cents a KWH, it will get > pricey fast. The building is insulated, but ran out of money to put > siding on it yet, just insulation board and R13 fiberglass. On the > chance that power fails and it is zero outside, and other than a long > time for tube gear oscillators to stabilize after turn on, what are > the effects of freezing temps on things like electrolytics? I've got > a couple pieces of higher end test equipment, a comm service monitor > and a Tektronix 465M scope, any adverse effects on those? > > Charlie, W4MEC in NC ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Archives: http://mailman.qth.net/pipermail/amradio/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio at mailman.qth.net To unsubscribe, send an email to amradio-request at mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to w3slk at verizon.net From jcandela at prodigy.net Sun Jan 3 18:22:23 2016 From: jcandela at prodigy.net (Jim Candela) Date: Sun, 3 Jan 2016 16:22:23 -0700 Subject: [AMRadio] Freezing electrolytics and other stuff In-Reply-To: <64AB2737EB8B4251B7A16EC1689FDD08@JimPC> References: <1930288073.6384672.1451853564022.JavaMail.yahoo.ref@mail.yahoo.com> <1930288073.6384672.1451853564022.JavaMail.yahoo@mail.yahoo.com> <56899CA6.60401@comcast.net> <64AB2737EB8B4251B7A16EC1689FDD08@JimPC> Message-ID: <58407FEC-1FD7-40C2-B388-11D49EDF0ED0@prodigy.net> Might also consider the effect from extreme cold on LCD displays, and memory hold up batteries. I have a HP 8591A spectrum analyzer with a 3 volt battery which holds all the calibrations and config. I'd worry about that battery if it stayed sub freezing for a long interval. Jim Wd5jko Sent from my iPhone On Jan 3, 2016, at 3:45 PM, wrote: > Charlie, > > Check the specifications for the caps you plan to use. Looking at the specifications for aluminum electrolytic caps I see the minimum operating temperature range from -25 to -50 C. I looked at the Mouser site to find those numbers. Give that information I don't think I would be concerned. What is of concern is how old they are. As they age the paste will dry so, if you are using caps that are old I would do a leakage test. > > A few years back I ordered some Sprague caps to have for stock. They have been stored in a climate controlled atmosphere (read indoors heated and cooled) for about 6 years. I installed some of them in a receiver and in about a year they started leaking. I replaced them with more from stock and the same thing, so I ordered new ones and the problem went away. I can only guess they all came from a bad batch. They were of different values and voltages. I have yet to understand why that happened. > > Jim > W5JO > > -----Original Message----- > Charlie, > > Put a few Electrolytic caps in your freezer. after a week or so, take > out and test. > > I'm going to do that myself, and then test to see if issues arise. > > Regards, Bob > > > On 1/3/2016 3:39 PM, CL in NC via AMRadio wrote: >> Do to circumstances beyond my control, I am having to relocate my shop to another building. Prior to this move, my shop was attached to the house and had some residual heat getting in that kept it OK, nothing like the temp swings now. Right now I use a kerosene heater when I am out there working, but have been leaving a special type of electric heater on when I am not there when freezing temps are expected. So far, the electric unit keeps the temp around 40 if it's 20 out, but a 8 cents a KWH, it will get pricey fast. The building is insulated, but ran out of money to put siding on it yet, just insulation board and R13 fiberglass. On the chance that power fails and it is zero outside, and other than a long time for tube gear oscillators to stabilize after turn on, what are the effects of freezing temps on things like electrolytics? I've got a couple pieces of higher end test equipment, a comm service monitor and a Tektronix 465M scope, any adverse effects on those? >> >> Charlie, W4MEC in NC > > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Archives: http://mailman.qth.net/pipermail/amradio/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Post: AMRadio at mailman.qth.net > To unsubscribe, send an email to amradio-request at mailman.qth.net with > the word unsubscribe in the message body. > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to jcandela at prodigy.net From w3slk at verizon.net Sun Jan 3 20:04:32 2016 From: w3slk at verizon.net (Mike Sawyer) Date: Sun, 03 Jan 2016 20:04:32 -0500 Subject: [AMRadio] Freezing electrolytics and other stuff In-Reply-To: <58407FEC-1FD7-40C2-B388-11D49EDF0ED0@prodigy.net> References: <1930288073.6384672.1451853564022.JavaMail.yahoo.ref@mail.yahoo.com> <1930288073.6384672.1451853564022.JavaMail.yahoo@mail.yahoo.com> <56899CA6.60401@comcast.net> <64AB2737EB8B4251B7A16EC1689FDD08@JimPC> <58407FEC-1FD7-40C2-B388-11D49EDF0ED0@prodigy.net> Message-ID: <000601d1468b$df7f37b0$9e7da710$@verizon.net> Good point Jim. Also Lithium Oxide batteries do not like the cold weather either. We learned that at work when we had all of our cordless tools and chargers in a building without heat. Cost us a good amount of money for new batteries! Mod-U-Lator, Mike(y)/W3SLK -----Original Message----- From: AMRadio [mailto:amradio-bounces at mailman.qth.net] On Behalf Of Jim Candela Sent: Sunday, January 3, 2016 6:22 PM To: Cc: Subject: Re: [AMRadio] Freezing electrolytics and other stuff Might also consider the effect from extreme cold on LCD displays, and memory hold up batteries. I have a HP 8591A spectrum analyzer with a 3 volt battery which holds all the calibrations and config. I'd worry about that battery if it stayed sub freezing for a long interval. Jim Wd5jko Sent from my iPhone On Jan 3, 2016, at 3:45 PM, wrote: > Charlie, > > Check the specifications for the caps you plan to use. Looking at the specifications for aluminum electrolytic caps I see the minimum operating temperature range from -25 to -50 C. I looked at the Mouser site to find those numbers. Give that information I don't think I would be concerned. What is of concern is how old they are. As they age the paste will dry so, if you are using caps that are old I would do a leakage test. > > A few years back I ordered some Sprague caps to have for stock. They have been stored in a climate controlled atmosphere (read indoors heated and cooled) for about 6 years. I installed some of them in a receiver and in about a year they started leaking. I replaced them with more from stock and the same thing, so I ordered new ones and the problem went away. I can only guess they all came from a bad batch. They were of different values and voltages. I have yet to understand why that happened. > > Jim > W5JO > > -----Original Message----- > Charlie, > > Put a few Electrolytic caps in your freezer. after a week or so, take > out and test. > > I'm going to do that myself, and then test to see if issues arise. > > Regards, Bob > > > On 1/3/2016 3:39 PM, CL in NC via AMRadio wrote: >> Do to circumstances beyond my control, I am having to relocate my shop to another building. Prior to this move, my shop was attached to the house and had some residual heat getting in that kept it OK, nothing like the temp swings now. Right now I use a kerosene heater when I am out there working, but have been leaving a special type of electric heater on when I am not there when freezing temps are expected. So far, the electric unit keeps the temp around 40 if it's 20 out, but a 8 cents a KWH, it will get pricey fast. The building is insulated, but ran out of money to put siding on it yet, just insulation board and R13 fiberglass. On the chance that power fails and it is zero outside, and other than a long time for tube gear oscillators to stabilize after turn on, what are the effects of freezing temps on things like electrolytics? I've got a couple pieces of higher end test equipment, a comm service monitor and a Tektronix 465M scope, any adverse effects on those? >> >> Charlie, W4MEC in NC > > ______________________________________________________________ > Our Main Website: http://www.amfone.net AMRadio mailing list > Archives: http://mailman.qth.net/pipermail/amradio/ > List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: > http://mailman.qth.net/mailman/listinfo/amradio > Post: AMRadio at mailman.qth.net > To unsubscribe, send an email to amradio-request at mailman.qth.net with > the word unsubscribe in the message body. > > This list hosted by: http://www.qsl.net Please help support this email > list: http://www.qsl.net/donate.html Message delivered to > jcandela at prodigy.net ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Archives: http://mailman.qth.net/pipermail/amradio/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio at mailman.qth.net To unsubscribe, send an email to amradio-request at mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to w3slk at verizon.net From mjcal77 at yahoo.com Mon Jan 4 21:31:26 2016 From: mjcal77 at yahoo.com (CL in NC) Date: Tue, 5 Jan 2016 02:31:26 +0000 (UTC) Subject: [AMRadio] Freezing caps input References: <220381546.122087.1451961086446.JavaMail.yahoo.ref@mail.yahoo.com> Message-ID: <220381546.122087.1451961086446.JavaMail.yahoo@mail.yahoo.com> Thanks for the thoughts on the cold WX and electronics. Have to agree that plenty of cars sit in the frigid temps of the north and their computers and radios and other stuff continue to work. Guess I won't worry about it as much, but the cold sure coagulates the grease in the HP608F tuning mechanism. Charlie, W4MEC in NC From k4kyv at charter.net Wed Jan 6 13:36:16 2016 From: k4kyv at charter.net (Donald Chester) Date: Wed, 6 Jan 2016 12:36:16 -0600 Subject: [AMRadio] UNITED STATES EARLY RADIO HISTORY Message-ID: <001c01d148b1$20db76c0$62926440$@charter.net> Articles and extracts about early radio and related technologies, concentrating on the United States in the period from 1897 to 1927, but some history to the present. An assortment of highlights -- plus a few lowlifes -- about early U.S. radio history. Emphasis is primarily on broadcasting, but includes a couple of sections on amateur radio. This webpage was begun September 30, 1996; over time more articles are promised, to cover additional topics and expand on the existing ones. http://earlyradiohistory.us/ More articles and links than I'll probably ever have time to read. Don k4kyv From mjcal77 at yahoo.com Wed Jan 6 16:07:01 2016 From: mjcal77 at yahoo.com (CL in NC) Date: Wed, 6 Jan 2016 21:07:01 +0000 (UTC) Subject: [AMRadio] 3 way ARC 5 drive References: <1196565381.1204768.1452114421831.JavaMail.yahoo.ref@mail.yahoo.com> Message-ID: <1196565381.1204768.1452114421831.JavaMail.yahoo@mail.yahoo.com> I don't think I have asked this here, have not received any input from a couple other groups, maybe somebody knows here. I have a mechanical drive for the tuning of an ARC 5 receiver with an extra output port. It screws on the receiver like a normal right angle drive, takes the tuning cable from the control box, but it also has another output, or maybe input, shaft. It could be used to tune two identical receivers with one control box, or maybe drive a remote tuning indicator at another spot in the aircraft for somebody that needed to know where the RX was tuned. I can't find any thing about it or pictures of it in use. Maybe it is not even used on comm gear. It is identical to the normal right angle drive adapter, just in 'T' fashion. Any ideas? Charlie, W4MEC in NC From ajsklar at w7as.com Wed Jan 6 19:38:55 2016 From: ajsklar at w7as.com (Allen Sklar) Date: Wed, 06 Jan 2016 17:38:55 -0700 Subject: [AMRadio] United States Early Radio History Message-ID: <20160106173855.730d0515a5037a5f3bfcd7a4dfd99e21.8d785be111.wbe@email03.secureserver.net> From ka1kaq at gmail.com Thu Jan 7 09:46:21 2016 From: ka1kaq at gmail.com (Todd, KA1KAQ) Date: Thu, 7 Jan 2016 09:46:21 -0500 Subject: [AMRadio] 3 way ARC 5 drive In-Reply-To: <1196565381.1204768.1452114421831.JavaMail.yahoo@mail.yahoo.com> References: <1196565381.1204768.1452114421831.JavaMail.yahoo.ref@mail.yahoo.com> <1196565381.1204768.1452114421831.JavaMail.yahoo@mail.yahoo.com> Message-ID: On Wed, Jan 6, 2016 at 4:07 PM, CL in NC via AMRadio < amradio at mailman.qth.net> wrote: > I don't think I have asked this here, have not received any input from a > couple other groups, maybe somebody knows here. > > I have a mechanical drive for the tuning of an ARC 5 receiver with an > extra output port. It screws on the receiver like a normal right angle > drive, takes the tuning cable from the control box, but it also has another > output, or maybe input, shaft. It could be used to tune two identical > receivers with one control box, or maybe drive a remote tuning indicator at > another spot in the aircraft for somebody that needed to know where the RX > was tuned. I can't find any thing about it or pictures of it in use. > Maybe it is not even used on comm gear. It is identical to the normal right > angle drive adapter, just in 'T' fashion. Any ideas? > I'm not aware of such a beast for the Command set/ARC-5 family, Charlie. Have you actually hooked it onto a receiver to see if it fits? More likely it's a slightly larger thread to fit the RU-* family of receivers. Have one at home, I can check the number when I get back. The most common configuration I've seen them used for is dual operating positions. For example, radioman and pilot. The center connected to the receiver with a spline traveling from each side of the 'T' to one of the operators to allow for tuning from either position using the MC-135 tuning control. The only caveat is, one control requires a reverse-reading dial, 100-0 vs 0-100, since it rotates in the opposite direction. Complete radio packages included both dials. In reality, the T was generally redundant as the RU-receiver has a dual spline port on the front below the tuning dial anyhow. There was a similar pre-war Army receiver that may have utilized it better, the ARB as well. ~ Todd, KA1KAQ/4 From manualman at juno.com Thu Jan 7 14:59:19 2016 From: manualman at juno.com (manualman at juno.com) Date: Thu, 7 Jan 2016 14:59:19 -0500 Subject: [AMRadio] Clearing Out Old Manuals - Epilog Message-ID: I wanted to thank everyone who participated in my 2015 cleaning out old manual sale. The sale officially ended 1/6/16 and remaining old stuff has gone to recycling. Some statistics: 272 e-mail requests for one or more items 62% of e-mail requests failed to provide address and/or ZIP (as requested) to compute shipping which resulted in additional e-mails but manageable. 2 canceled. 4 received e-mail quotes and disappeared without an additional word. Overall feedback seemed to be very positive on items received. As I did last year, monies received in the sale were additionally matched by me (ManualMan) and donated equally to three of my favorite national charities. Again, thanks to all, and hope you all have a healthy, happy, and prosperous 2016. Pete, wa2cwa www.manualman.com From jcaldwell at rbcos.com Tue Jan 12 16:07:16 2016 From: jcaldwell at rbcos.com (John P. Caldwell) Date: Tue, 12 Jan 2016 16:07:16 -0500 Subject: [AMRadio] FS - RCA BTA-250M, on 160M, Working Message-ID: <007401d14d7d$37b98190$a72c84b0$@rbcos.com> I have a RCA BTA-250M transmitter w/ home brew speech amplifier available. The 250M has a pair of 813?s modulating a pair of 813?s in the final amplifier. It?s early to mid 1950?s vintage. It?s conservatively rated at 250W output and is operational on 160M. The transmitter is in great condition and includes the manual, along w/ some historic documentation and misc parts. The transmitter was last in commercial service on 910KHz in Sioux Falls, S.D and was acquired by the SK I got it from in the mid 90?s. It will easily move up to 75M if desired. It?s got a 120/220VAC SINGLE phase primary which makes it very easy to deal with compared to many ex-commercial transmitters. Generally, units 1KW and higher have 3 phase inputs, making them useless to most of the ham community. The BTA-250M is 84? tall and approx. 600 lbs net weight. Two people can manage it w/ an appliance cart. I?m willing to travel and meet at a reasonable distance for gas money if that helps. I?m located about ? way between Cincinnati and Dayton so if you wanted to attend the Dayton Hamvention in May, that?s an option to consider. I?m also considering going to Orlando next month, so delivery could be worked out depending on buyers location. I?m asking $1200. Trades considered. Please contact me off-line for photos and info. jcaldwell at rbcos.com John WD8INC From k4kyv at charter.net Wed Jan 13 14:27:51 2016 From: k4kyv at charter.net (Donald Chester) Date: Wed, 13 Jan 2016 13:27:51 -0600 Subject: [AMRadio] ARRL Petitions FCC to Reduce 75/80m Phone Allocation from 3600-4000 to 3650-4000 Message-ID: <001f01d14e38$7e998360$7bcc8a20$@charter.net> Regardless of your opinion of this proposal, I would urge everyone to submit comments to the FCC as soon as (or if) the FCC assigns it a RM- number. Most importantly, please read the entire text of the League's petition before formulating comments. While the ARRL's Petition points out that the proposed change has received "strong support from the ARRL membership", it must be remembered that the ARRL membership comprises a minority of licensed amateurs, so this petition does not necessarily represent the wishes of the greater amateur community. Apparently the main impetus behind this petition is to benefit users of Automatically Controlled Digital Station modes; "the most substantial adverse effect of the unexpected and vast expansion of the 75 meter phone/image (to 3600 kHz) was the elimination of access to 3620-3635 kHz by ACDS" says the League. For those unfamiliar with ACDS, see Part 97 : Sec. 97.221 of the rules: Automatically controlled digital station (a) This rule section does not apply to an auxiliary station, a beacon station, a repeater station, an earth station, a space station, or a space telecommand station. (b) A station may be automatically controlled while transmitting a RTTY or data emission on the 6 m or shorter wavelength bands, and on the 28.120-28.189 MHz, 24.925-24.930 MHz, 21.090-21.100 MHz, 18.105-18.110 MHz, 14.0950-14.0995 MHz, 14.1005-14.112 MHz, 10.140-10.150 MHz, 7.100-7.105 MHz, or 3.585-3.600 MHz segments. (c) A station may be automatically controlled while transmitting a RTTY or data emission on any other frequency authorized for such emission types provided that: (1) The station is responding to interrogation by a station under local or remote control; and (2) No transmission from the automatically controlled station occupies a bandwidth of more than 500 Hz. [60 FR 26001, May 16, 1995, as amended at 72 FR 3082, Jan. 24, 2007] The League likely started out on the wrong foot with this petition from the outset, referring to the FCC's original expansion of the phone band down to 3600 as a "Reapportioning Error" and "a very substantial and unjustifiable departure" from what had been originally proposed. Regulatory agencies like the FCC rarely admit they were in error in a recent rulemaking decision, which would amount to officially acknowledging that their wisdom might be less than infinite. http://www.arrl.org/news/arrl-asks-fcc-for-minimal-but-necessary-changes-to- correct-reapportioning-error (note: the above link will probably appear truncated with a line-break, so you may have to copy and paste the complete URL into your browser's address bar.) From w1ksz at earthlink.net Wed Jan 13 17:03:50 2016 From: w1ksz at earthlink.net (W1KSZ) Date: Wed, 13 Jan 2016 15:03:50 -0700 Subject: [AMRadio] ARRL Petitions FCC to Reduce 75/80m Phone Allocation from 3600-4000 to 3650-4000 In-Reply-To: <001f01d14e38$7e998360$7bcc8a20$@charter.net> References: <001f01d14e38$7e998360$7bcc8a20$@charter.net> Message-ID: <5696C9C6.5040200@earthlink.net> That begs the question ... how many folks use ACDS Mode ? 3, 4 ?? What is it really used for ?? 73, Dick, W1KSZ On 1/13/2016 12:27 PM, Donald Chester wrote: > Regardless of your opinion of this proposal, I would urge everyone to submit > comments to the FCC as soon as (or if) the FCC assigns it a RM- number. Most > importantly, please read the entire text of the League's petition before > formulating comments. > > While the ARRL's Petition points out that the proposed change has received > "strong support from the ARRL membership", it must be remembered that the > ARRL membership comprises a minority of licensed amateurs, so this petition > does not necessarily represent the wishes of the greater amateur community. > > Apparently the main impetus behind this petition is to benefit users of > Automatically Controlled Digital Station modes; "the most substantial > adverse effect of the unexpected and vast expansion of the 75 meter > phone/image (to 3600 kHz) was the elimination of access to 3620-3635 kHz by > ACDS" says the League. > > For those unfamiliar with ACDS, see Part 97 : Sec. 97.221 of the rules: > > Automatically controlled digital station > (a) This rule section does not apply to an auxiliary station, a beacon > station, a repeater station, an earth station, a space station, or a space > telecommand station. > > (b) A station may be automatically controlled while transmitting a RTTY or > data emission on the 6 m or shorter wavelength bands, and on the > 28.120-28.189 MHz, 24.925-24.930 MHz, 21.090-21.100 MHz, 18.105-18.110 MHz, > 14.0950-14.0995 MHz, 14.1005-14.112 MHz, 10.140-10.150 MHz, 7.100-7.105 MHz, > or 3.585-3.600 MHz segments. > > (c) A station may be automatically controlled while transmitting a RTTY or > data emission on any other frequency authorized for such emission types > provided that: > > (1) The station is responding to interrogation by a station under local or > remote control; and > > (2) No transmission from the automatically controlled station occupies a > bandwidth of more than 500 Hz. > > [60 FR 26001, May 16, 1995, as amended at 72 FR 3082, Jan. 24, 2007] > > The League likely started out on the wrong foot with this petition from the > outset, referring to the FCC's original expansion of the phone band down to > 3600 as a "Reapportioning Error" and "a very substantial and unjustifiable > departure" from what had been originally proposed. Regulatory agencies like > the FCC rarely admit they were in error in a recent rulemaking decision, > which would amount to officially acknowledging that their wisdom might be > less than infinite. > > http://www.arrl.org/news/arrl-asks-fcc-for-minimal-but-necessary-changes-to- > correct-reapportioning-error > (note: the above link will probably appear truncated with a line-break, so > you may have to copy and paste the complete URL into your browser's address > bar.) > > > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Archives: http://mailman.qth.net/pipermail/amradio/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Post: AMRadio at mailman.qth.net > To unsubscribe, send an email to amradio-request at mailman.qth.net with > the word unsubscribe in the message body. > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to w1ksz at earthlink.net From w4wsz at embarqmail.com Wed Jan 13 18:38:48 2016 From: w4wsz at embarqmail.com (Bob. W4WSZ) Date: Wed, 13 Jan 2016 18:38:48 -0500 Subject: [AMRadio] RCA BW-66F Message-ID: <002701d14e5b$8d32c440$a7984cc0$@embarqmail.com> I would like to contact anyone that is using a RCA BW-66F Modulation Monitor. The unit requires very low signal input for monitoring up to 2mhz. If you try to get it to 3.8 mhz, it requires almost 3 watts of input. There must be a way of getting around the input circuit. Your thoughts ???? Thanks, Bob From w4wsz at embarqmail.com Wed Jan 13 18:43:07 2016 From: w4wsz at embarqmail.com (Bob. W4WSZ) Date: Wed, 13 Jan 2016 18:43:07 -0500 Subject: [AMRadio] TRA-1F AM RF Amplifier Message-ID: <002c01d14e5c$27ebaf10$77c30d30$@embarqmail.com> Anyone familiar with the Wilkinson Electronics TRF-1A unit that was used to drive the modulation monitor and also provided a scope output ? Thanks, Bob From k4kyv at charter.net Wed Jan 13 22:40:56 2016 From: k4kyv at charter.net (Donald Chester) Date: Wed, 13 Jan 2016 21:40:56 -0600 Subject: [AMRadio] ARRL Petitions FCC to Reduce 75/80m Phone Allocation from 3600-4000 to 3650-4000 In-Reply-To: <5696C9C6.5040200@earthlink.net> References: <001f01d14e38$7e998360$7bcc8a20$@charter.net> <5696C9C6.5040200@earthlink.net> Message-ID: <005601d14e7d$60867c80$21937580$@charter.net> One use is a mode called Winlink. Basically a wireless internet connection via amateur radio. Used by well-to-do yachtsmen cruising the Caribbean, who are neverthteless too cheap to subscribe to a commercial satellite-based internet service. -----Original Message----- From: AMRadio [mailto:amradio-bounces at mailman.qth.net] On Behalf Of W1KSZ Sent: Wednesday, 13 January, 2016 16:04 To: amradio at mailman.qth.net Subject: Re: [AMRadio] ARRL Petitions FCC to Reduce 75/80m Phone Allocation from 3600-4000 to 3650-4000 That begs the question ... how many folks use ACDS Mode ? 3, 4 ?? What is it really used for ?? 73, Dick, W1KSZ From ranchorobbo at gmail.com Thu Jan 14 22:10:01 2016 From: ranchorobbo at gmail.com (Rob Atkinson) Date: Thu, 14 Jan 2016 21:10:01 -0600 Subject: [AMRadio] ARRL Petitions FCC to Reduce 75/80m Phone Allocation from 3600-4000 to 3650-4000 In-Reply-To: <001f01d14e38$7e998360$7bcc8a20$@charter.net> References: <001f01d14e38$7e998360$7bcc8a20$@charter.net> Message-ID: I am interested in finding out what the "error" is that the ARRL claims the FCC committed. It seems to me the FCC knew what they were doing. The flaw here if you will, is the lumping of "phone" with "image," hereafter referred to as digital, because that's simply what it is. The 3600 to 3700 range is a nice place for radiotelephone operation, i.e. AM, because of its relative lack of congestion. I have been operating a bit on 3700 but regular use of frequencies below 3700 would be better. This space should be preserved as it has been for the past 9 or 10 years. A significant flaw has to do with the so-called "phone/image" mode label, as if the "image" (read digital) is compatible with analog modes. It is not. There is already a problem with nuisance scofflaw activities of some operators, who use that mode to intentionally cause QRM to phone operators minding their own business. These lids, often recently licensed, use the flawed legal ID rule to hide their identities, knowing most phone operators are not equipped to decode their white noise transmissions. But even if all of the digital operations employing SSB transceivers, were orderly, this digital mode would still need to be treated like any other digital mode and be separated from analog modes because the noise from these emissions in the passbands of regular analog superhet receivers makes operation on nearby frequencies challenging when a weak signal is being heard. It is established by a significant consensus among broadcast engineers and technicians in the U.S. that combining digital and analog transmission in the medium wave AM band has been a disaster. For the same reason, the two modes are not compatible and the digital causes harmful interference with analog signals on adjacent channels, spaced 10 kc in the U.S. For example, I am unable to listen to WSM on 650 because of digital noise coming from a station on 670 kc. It would be helpful if FCC would reinstate the CW or analog voice ID requirement for digital modes, which would allow hams with typical common analog equipment to identify stations causing deliberately harmful interference. If _all_ digital were segregated below 3650, I could be persuaded to go along with the proposal, but the solution ARRL is seeking isn't addressing the real problem. ARRL needs to back up and firstly classify all digital protocols regardless of whatever label they want to paste on them, as digital, and then put forth a plan that recognizes the reality that analog and digital are not compatible. The ARRL is only one "vote" in the FCC ECFS. They may claim to represent thousands of hams but I believe legally they only count for one opinion and voice. We all will have an opportunity to comment, assuming FCC does not dismiss the petition. 73 Rob K5UJ From k4kyv at charter.net Fri Jan 15 12:54:26 2016 From: k4kyv at charter.net (Donald Chester) Date: Fri, 15 Jan 2016 11:54:26 -0600 Subject: [AMRadio] ARRL Petitions FCC to Reduce 75/80m Phone Allocation from 3600-4000 to 3650-4000 Message-ID: <001201d14fbd$c6bccbd0$54366370$@charter.net> >> That begs the question ... how many folks use ACDS Mode ? >> 3, 4 ?? What is it really used for ?? >> 73, Dick, W1KSZ > One use is a mode called Winlink. Basically a wireless internet connection via amateur radio. > Used by well-to-do yachtsmen cruising the Caribbean, who are nevertheless too cheap to > subscribe to a commercial satellite-based internet service. Go to (copy/paste entire link into your browser address bar to circumvent any disabling line break): http://www.sailnet.com/forums/electronics/124634-ham-v-ssb-frequencies-check -radio-unlocked-ham.html (Quoting from above link) " I have a HAM Extra license (but have never really used it for voice, only got it to legally send email over the radio)..." That about says it all, right there. (Continuing quote) "...I finally have a boat with an ICOM IC-M700Pro which works fine for email via HAM and SAILMAIL. I'm told by previous owner that the radio is unlocked for HAM. How can I prove/check this? Where can I go to find a list of HAM only (or since I have the HAM frequencies, where can I go to find the SSB only ones as that would also allow me to answer the question) frequencies. I'm assuming there is some overlap. I figure once i know a HAM ONLY frequency I can simply attempt to transmit and it will either work, or not. If not, I still need to get radio unlocked (which would be my NEXT problem). Just to confirm, I DO have a ham license (AI4QI) and am legal to transmit." (reply to above) "Your ham course study material should have a list of the ham bands; alternately you can find them all over the 'net, but (since stopping here wouldn't be much use to anyone), try one of the nets on 14.300..." See the previous thread regarding Extra Class. If it isn't enough to be a licensed Extra for a quarter-century and never figure out how a simple half-wave coax-fed dipole works, an Extra class operator (whose licence, according to QRZ.com lookup, is about to expire), not knowing what the ham frequencies are, or which frequencies are legal for transmitting SSB, has to be the straw that broke the camel's back. From ranchorobbo at gmail.com Fri Jan 15 13:23:40 2016 From: ranchorobbo at gmail.com (Rob Atkinson) Date: Fri, 15 Jan 2016 12:23:40 -0600 Subject: [AMRadio] ARRL Petitions FCC to Reduce 75/80m Phone Allocation from 3600-4000 to 3650-4000 In-Reply-To: <001201d14fbd$c6bccbd0$54366370$@charter.net> References: <001201d14fbd$c6bccbd0$54366370$@charter.net> Message-ID: This reminds me of a letter to editor published in CQ a few years back. The writer told of attending a meeting of EmComm folks somewhere in Southern Calif. and how he was saddened to discover that not one person attending had any interest in amateur radio for pleasure. They only wanted tickets to use their handy talkies for emergencies and wanted nothing to do with "ham culture," viewing it with some distaste. Rob K5UJ > > See the previous thread regarding Extra Class. If it isn't enough to be a > licensed Extra for a quarter-century and never figure out how a simple > half-wave coax-fed dipole works, an Extra class operator (whose licence, > according to QRZ.com lookup, is about to expire), not knowing what the ham > frequencies are, or which frequencies are legal for transmitting SSB, has to > be the straw that broke the camel's back. From mjcal77 at yahoo.com Fri Jan 15 14:13:18 2016 From: mjcal77 at yahoo.com (CL in NC) Date: Fri, 15 Jan 2016 19:13:18 +0000 (UTC) Subject: [AMRadio] ARRL and hams References: <1430321948.556112.1452885198673.JavaMail.yahoo.ref@mail.yahoo.com> Message-ID: <1430321948.556112.1452885198673.JavaMail.yahoo@mail.yahoo.com> Remember, there are over 710,000 hams and only 160,000 or so belong to the ARRL. 1/5 of the ham population is heard by the FCC from this organizations input and many times the ARRL's opinion is not the opinion of their members. To see the extent of what goes on in the picture modes, set up a station to copy slowscan, even if you use one of the free computer software options, and just put your RX on one of the slowscan watering holes and let it record the goings on over 24 hours and then review the images. Can be quite graphic at times. And you thought sending the picture of the nekkid lady on RTTY from a perf tape was bad. Charlie W4MEC in NC From w1ksz at earthlink.net Fri Jan 15 16:20:15 2016 From: w1ksz at earthlink.net (W1KSZ) Date: Fri, 15 Jan 2016 14:20:15 -0700 Subject: [AMRadio] ARRL Petitions FCC to Reduce 75/80m Phone Allocation from 3600-4000 to 3650-4000 In-Reply-To: <001201d14fbd$c6bccbd0$54366370$@charter.net> References: <001201d14fbd$c6bccbd0$54366370$@charter.net> Message-ID: <5699628F.7040501@earthlink.net> That's what happens when you lower the requirements to the hobby. A sad state of affairs. 73, Dick, W1KSZ On 1/15/2016 10:54 AM, Donald Chester wrote: > http://www.sailnet.com/forums/electronics/124634-ham-v-ssb-frequencies-check > -radio-unlocked-ham.html From k4kyv at charter.net Fri Jan 15 18:13:19 2016 From: k4kyv at charter.net (Donald Chester) Date: Fri, 15 Jan 2016 17:13:19 -0600 Subject: [AMRadio] ARRL Petitions FCC to Reduce 75/80m Phone Allocation from 3600-4000 to 3650-4000 In-Reply-To: <001201d14fbd$c6bccbd0$54366370$@charter.net> References: <001201d14fbd$c6bccbd0$54366370$@charter.net> Message-ID: <000701d14fea$52905fb0$f7b11f10$@charter.net> I see a substantial error in the ARRL's petition: in paragraph 10 on page 10, they state "Even if the phone/image subband at 75m is reduced in size from 400 kHz to 350 kHz as herein proposed, it will still be the largest phone/image subband among all of the HF Amateur allocations." What about the 10m phone band? It is 1400 kHz wide, and isn't 28.3-29.7 MHz an HF amateur allocation? Don k4kyv From ranchorobbo at gmail.com Fri Jan 15 18:43:42 2016 From: ranchorobbo at gmail.com (Rob Atkinson) Date: Fri, 15 Jan 2016 17:43:42 -0600 Subject: [AMRadio] StackExchange has a ham radio forum Message-ID: If you are a software developer you are probably familiar with Stack Overflow, part of StackExchange. I just found out StackExchange has a ham forum. http://ham.stackexchange.com/ The StackExchange universe is here: http://stackexchange.com/sites# 73 Rob K5UJ From qedconsultants at embarqmail.com Sat Jan 16 08:13:57 2016 From: qedconsultants at embarqmail.com (Bernie Doran) Date: Sat, 16 Jan 2016 08:13:57 -0500 Subject: [AMRadio] ARRL Petitions FCC to Reduce 75/80m Phone Allocation from 3600-4000 to 3650-4000 In-Reply-To: <5699628F.7040501@earthlink.net> References: <001201d14fbd$c6bccbd0$54366370$@charter.net> <5699628F.7040501@earthlink.net> Message-ID: ----- A few years back, a five year old male (close to six) passed his license exam. From w4wsz at embarqmail.com Sun Jan 17 19:34:24 2016 From: w4wsz at embarqmail.com (Bob. W4WSZ) Date: Sun, 17 Jan 2016 19:34:24 -0500 Subject: [AMRadio] M-5774 Schematic Message-ID: <00f001d15187$fba56390$f2f02ab0$@embarqmail.com> I am looking for the schematic for a Gates M-5774 Modulation Monitor. This is the model that had an input range of .54 thru 30 mhz. Any help would be appreciated. Thanks, Bob,W4WSZ From paul at paulbaldock.com Tue Jan 19 21:23:54 2016 From: paul at paulbaldock.com (Paul Baldock) Date: Tue, 19 Jan 2016 18:23:54 -0800 Subject: [AMRadio] Globe Scout Deluxe question Message-ID: Does anybody out there have a Globe Scout Deluxe? I want to make sure the builder of mine did not get confused between the mod choke and the supply choke. The mod choke and the supply choke look very different, so if someone could describe to me which is which the I will check that they have been wired correctly. The users manual I have does not have any physical drawing or description. Thanks - Paul --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus From ars.w5omr at gmail.com Tue Jan 19 22:36:37 2016 From: ars.w5omr at gmail.com (Geoff) Date: Tue, 19 Jan 2016 21:36:37 -0600 Subject: [AMRadio] ARRL Petitions FCC to Reduce 75/80m Phone Allocation from 3600-4000 to 3650-4000 In-Reply-To: References: <001201d14fbd$c6bccbd0$54366370$@charter.net> <5699628F.7040501@earthlink.net> Message-ID: <569F00C5.4050405@gmail.com> On 01/16/2016 07:13 AM, Bernie Doran wrote: > > ----- A few years back, a five year old male (close to six) passed his > license exam. > _ 25 or more years ago, a 7 year old passed his Extra exam (with 20wpm code). I fail to see the relevance. From w4wsz at embarqmail.com Wed Jan 20 08:09:26 2016 From: w4wsz at embarqmail.com (Bob. W4WSZ) Date: Wed, 20 Jan 2016 08:09:26 -0500 Subject: [AMRadio] CBS Vulumax 4000 Message-ID: <001901d15383$ca974ef0$5fc5ecd0$@embarqmail.com> Does anyone have the manual for CBS unit ? If so I will be happy to pay cost for copy and postage. I would be happy to copy the manual and pay for the postage both ways. I can send one or perhaps two great grand kids for security..............Thanks, Bob From mjcal77 at yahoo.com Wed Jan 20 08:48:47 2016 From: mjcal77 at yahoo.com (CL in NC) Date: Wed, 20 Jan 2016 13:48:47 +0000 (UTC) Subject: [AMRadio] Vintage book reprints References: <86057045.8594703.1453297727200.JavaMail.yahoo.ref@mail.yahoo.com> Message-ID: <86057045.8594703.1453297727200.JavaMail.yahoo@mail.yahoo.com> I found Lindsay Publications a good source for info on several subjects of my interest over the years, but never got this set. Old time Book Store has the radio experimenter set on sale, if you are really into the old stuff and building here's a nice read: http://www.youroldtimebookstore.com/product-p/22407.htm Charlie, W4MEC in NC From mjcal77 at yahoo.com Wed Jan 20 09:06:05 2016 From: mjcal77 at yahoo.com (CL in NC) Date: Wed, 20 Jan 2016 14:06:05 +0000 (UTC) Subject: [AMRadio] Vintage book reprints References: <474131328.8606429.1453298765446.JavaMail.yahoo.ref@mail.yahoo.com> Message-ID: <474131328.8606429.1453298765446.JavaMail.yahoo@mail.yahoo.com> There are 6 books in the series, here is the link to the whole set on sale: http://www.youroldtimebookstore.com/product-p/sos5.htm From w4wsz at embarqmail.com Wed Jan 20 20:29:57 2016 From: w4wsz at embarqmail.com (Bob. W4WSZ) Date: Wed, 20 Jan 2016 20:29:57 -0500 Subject: [AMRadio] CBS Volumax 4000 (four thousand) Message-ID: <007101d153eb$3d61e1e0$b825a5a0$@embarqmail.com> Does anyone have the manual for a CBS Volumax 4000 ? If so I will be happy to pay cost for copy and postage. I would be happy to copy the manual and pay for the postage both ways. I can send one or perhaps two great grand kids for security..............thanks for the replies for the other models but it has to be the model 4000 Thanks, Bob From ne1s at securespeed.us Sun Jan 24 12:08:07 2016 From: ne1s at securespeed.us (Larry Szendrei) Date: Sun, 24 Jan 2016 12:08:07 -0500 Subject: [AMRadio] Wanted: Tek 535A schematics Message-ID: <56A504F7.3020605@securespeed.us> Anyone have schematics for the Tektronics 535A 'scope? Either a paper or electronic copy would be fine. I didn't have any luck searching for a downloadable copy. I especially need the schematics for the vertical amplifier and the main and delayed sweep circuits. Thanks, -Larry/NE1S From jim.isbell at gmail.com Sun Jan 24 16:18:31 2016 From: jim.isbell at gmail.com (Jim Isbell, W5JAI) Date: Sun, 24 Jan 2016 15:18:31 -0600 Subject: [AMRadio] Inverted V antenna Message-ID: If you turn it over, will a "V" antenna work the same if it isnt inverted??? From ranchorobbo at gmail.com Sun Jan 24 16:20:51 2016 From: ranchorobbo at gmail.com (Rob Atkinson) Date: Sun, 24 Jan 2016 15:20:51 -0600 Subject: [AMRadio] Inverted V antenna In-Reply-To: References: Message-ID: not if the feed point is 5 feet off the ground. Rob K5UJ On Sun, Jan 24, 2016 at 3:18 PM, Jim Isbell, W5JAI wrote: > If you turn it over, will a "V" antenna work the same if it isnt inverted??? > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Archives: http://mailman.qth.net/pipermail/amradio/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Post: AMRadio at mailman.qth.net > To unsubscribe, send an email to amradio-request at mailman.qth.net with > the word unsubscribe in the message body. > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to ranchorobbo at gmail.com From w4wsz at embarqmail.com Sun Jan 24 16:25:45 2016 From: w4wsz at embarqmail.com (Bob. W4WSZ) Date: Sun, 24 Jan 2016 16:25:45 -0500 Subject: [AMRadio] Manual Needed Message-ID: <001d01d156ed$c97f3510$5c7d9f30$@embarqmail.com> Still searching for a CBS Volumax 4000 manual.....there has to be one somewhere out there Stay warm my friends in the North Bob From ne1s at securespeed.us Sun Jan 24 20:57:30 2016 From: ne1s at securespeed.us (Larry Szendrei) Date: Sun, 24 Jan 2016 20:57:30 -0500 Subject: [AMRadio] Inverted V antenna In-Reply-To: References: Message-ID: <56A5810A.8000400@securespeed.us> On 1/24/16 4:20 PM, Rob Atkinson wrote: > not if the feed point is 5 feet off the ground. > > > Rob > K5UJ > > On Sun, Jan 24, 2016 at 3:18 PM, Jim Isbell, W5JAI wrote: >> If you turn it over, will a "V" antenna work the same if it isnt inverted??? >> Doesn't that make it an inverted-inverted V? Isn't that the same as just a "V?" :-) Yours for pondering the deepest questions of the universe, -Larry/NE1S From k4kyv at charter.net Mon Jan 25 00:13:22 2016 From: k4kyv at charter.net (Donald Chester) Date: Sun, 24 Jan 2016 23:13:22 -0600 Subject: [AMRadio] Inverted V antenna In-Reply-To: <56A5810A.8000400@securespeed.us> References: <56A5810A.8000400@securespeed.us> Message-ID: <000a01d1572f$1ce64ef0$56b2ecd0$@charter.net> > On Sun, Jan 24, 2016 at 3:18 PM, Jim Isbell, W5JAI wrote: >> If you turn it over, will a "V" antenna work the same if it isnt inverted??? >> > Doesn't that make it an inverted-inverted V? Isn't that the same as just a "V?" :-) I think you are confusing it with a horizontal vee or vee-beam. Besides, if you have two tall supports to hold up the ends, why not go ahead and pull the wire tight enough to raise the mid-point and make it a true horizontal dipole? The inverted-vee is a compromise antenna designed to approach the performance of a horizontal half-wave dipole using only one high support. Don k4kyv From k4kyv at charter.net Mon Jan 25 13:15:34 2016 From: k4kyv at charter.net (Donald Chester) Date: Mon, 25 Jan 2016 12:15:34 -0600 Subject: [AMRadio] Inverted V antenna In-Reply-To: References: <56A5810A.8000400@securespeed.us> <000a01d1572f$1ce64ef0$56b2ecd0$@charter.net> Message-ID: <004401d1579c$6286a140$2793e3c0$@charter.net> The ?cone of silence? of the null off the ends of a horizontal half-wave dipole is very narrow (or maybe ?skinny? would be a better word), meaning it is limited to a very small range of vertical take-off angles, as well as horizontal coverage. For all practical purposes, a dipole, whether truly horizontal or inverted-vee, can be considered omni-directional, particularly on the 160m, 80m and 40m bands. The broadside advantage and end nulls are something blown way out of proportion in amateur radio lore, just like SWR. ?One frequently sees a dipole azimuth pattern depicting a very sharp null off of the ends of a dipole. While technically accurate, this can be very misleading ... and is a result of trying to depict a 3 dimensional pattern in 2 dimensions. **This often seen null is only evident at the same launch angle as the maximum broadside gain**. Of major significance is the large amount of gain off the ends at higher launch angles. Due to multiple lobes forming above ? wavelength, this is not easily shown in tabular form.? http://www.qsl.net/aa3rl/ant2.html Don k4kyv From: Jim Isbell, W5JAI [mailto:jim.isbell at gmail.com] But the inverted "V" does have radiation off the ends because there is a vertical component. I have seen the charts, its not great but it is something. BUT the dipole is NUL off the ends. Yes, I will sacrifice gain off the sides to get some gain off the ends by going with the "V" but without a rotateable dipole it at least gives me some coverage I cant get any other way. I have only one way the antenna can be oriented. NE to SW which, from South Texas, puts Washington/Oregon and the Caribbean in the NULs. >> If you turn it over, will a "V" antenna work the same if it isnt inverted??? >> > Doesn't that make it an inverted-inverted V? Isn't that the same as just a "V?" :-) I think you are confusing it with a horizontal vee or vee-beam. Besides, if you have two tall supports to hold up the ends, why not go ahead and pull the wire tight enough to raise the mid-point and make it a true horizontal dipole? The inverted-vee is a compromise antenna designed to approach the performance of a horizontal half-wave dipole using only one high support. Don k4kyv From mjcal77 at yahoo.com Mon Jan 25 13:40:59 2016 From: mjcal77 at yahoo.com (CL in NC) Date: Mon, 25 Jan 2016 18:40:59 +0000 (UTC) Subject: [AMRadio] Inverted V antenna References: <784522056.1049243.1453747259931.JavaMail.yahoo.ref@mail.yahoo.com> Message-ID: <784522056.1049243.1453747259931.JavaMail.yahoo@mail.yahoo.com> My understanding of the inverted VEE in addition to changing the pattern angles is that it lowers the feed point towards 50 ohms. I don't know if the first fellow to figure it out calculated that or he experimented by putting up a single support antenna, let the ends droop and said, "Hey, neat, it matches coax perfectly". If the ground is a determining factor for the Z change, then making it vertical may do something strange. It may act like a two direction sloper. Ground plane antennas do the same thing, they present a 35 ohm load like a vertical when the radials are 90 degs off the radiator, but let them droop down to 45 degs from horizontal and you can feed it with 50 ohm cable. How much does a 40 or 80 meter inverted VEE on a tower under a triband yagi a few feet above it effect the yagi, especially on 15 meters? Charlie, W4MEC in NC From k4kyv at charter.net Mon Jan 25 14:41:34 2016 From: k4kyv at charter.net (Donald Chester) Date: Mon, 25 Jan 2016 13:41:34 -0600 Subject: [AMRadio] Inverted V antenna In-Reply-To: <784522056.1049243.1453747259931.JavaMail.yahoo@mail.yahoo.com> References: <784522056.1049243.1453747259931.JavaMail.yahoo.ref@mail.yahoo.com> <784522056.1049243.1453747259931.JavaMail.yahoo@mail.yahoo.com> Message-ID: <000101d157a8$663b7570$32b26050$@charter.net> A half wave dipole in free space has a feedpoint Z of about 75 ohms. Ground reflections may affect impedance with a real world antenna a finite distance above the ground, but the impedance of an inverted vee will always be lower than that of a straight dipole. Imagine you have a half wave horizontal dipole some distance above ground. It will exhibit a certain impedance at the feed point, maybe not exactly 75 ohms depending on its height above ground, but somewhere in that ball park. Now, imagine you have a quarter-wave section of open wire line, suspended horizontally at the same height with nothing connected to the far end. Measure the impedance at the near end. The exact value will vary according to the characteristic of the line, but it will measure very low Z. Fan the two conductors out, from being close-spaced and parallel (OWL) until they are spread out completely horizontally. In doing this, you are changing the configuration from a quarter-wave section of parallel line, to a vee-shaped dipole, and finally to a straight line dipole. The Z will start off at a very low value, and increase as the wires are fanned out. It stands to logic that at some angle between zero degrees and 180 degrees, the Z will measure exactly 50 ohms. This same phenomenon explains the increase in Z with a ground plane, when drooping the radials down from 90? off the radiator to 45? from the horizontal. Don k4kyv -----Original Message----- From: AMRadio [mailto:amradio-bounces at mailman.qth.net] On Behalf Of CL in NC via AMRadio My understanding of the inverted VEE in addition to changing the pattern angles is that it lowers the feed point towards 50 ohms. I don't know if the first fellow to figure it out calculated that or he experimented by putting up a single support antenna, let the ends droop and said, "Hey, neat, it matches coax perfectly". If the ground is a determining factor for the Z change, then making it vertical may do something strange. It may act like a two direction sloper. Ground plane antennas do the same thing, they present a 35 ohm load like a vertical when the radials are 90 degs off the radiator, but let them droop down to 45 degs from horizontal and you can feed it with 50 ohm cable. From karlzuk at yahoo.com Mon Jan 25 19:57:23 2016 From: karlzuk at yahoo.com (Karl Zuk) Date: Tue, 26 Jan 2016 00:57:23 +0000 (UTC) Subject: [AMRadio] WSTC / WNLK CT silent In-Reply-To: <000101d157a8$663b7570$32b26050$@charter.net> References: <000101d157a8$663b7570$32b26050$@charter.net> Message-ID: <452781735.108006.1453769843324.JavaMail.yahoo@mail.yahoo.com> WSHU - Sacred Heart University's NPR network - has decided to silenceboth WNLK 1350 Norwalk, CT and WSTC 1400 Stamford, CT effective today.WSHU claimed that the combined listenership was about 900 people - not?enough to sustain continued operation of the stations. These stations aresupposed to be for sale. Karl Zuk ? Katonah, NY From ranchorobbo at gmail.com Tue Jan 26 06:43:26 2016 From: ranchorobbo at gmail.com (Rob Atkinson) Date: Tue, 26 Jan 2016 05:43:26 -0600 Subject: [AMRadio] WSTC / WNLK CT silent In-Reply-To: <452781735.108006.1453769843324.JavaMail.yahoo@mail.yahoo.com> References: <000101d157a8$663b7570$32b26050$@charter.net> <452781735.108006.1453769843324.JavaMail.yahoo@mail.yahoo.com> Message-ID: Any chance they have tube rigs they will want to let go? 73 Rob K5UJ On Mon, Jan 25, 2016 at 6:57 PM, Karl Zuk via AMRadio wrote: > WSHU - Sacred Heart University's NPR network - has decided to silenceboth WNLK 1350 Norwalk, CT and WSTC 1400 Stamford, CT effective today.WSHU claimed that the combined listenership was about 900 people - not enough to sustain continued operation of the stations. These stations aresupposed to be for sale. > Karl Zuk Katonah, NY > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Archives: http://mailman.qth.net/pipermail/amradio/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Post: AMRadio at mailman.qth.net > To unsubscribe, send an email to amradio-request at mailman.qth.net with > the word unsubscribe in the message body. > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to ranchorobbo at gmail.com From ranchorobbo at gmail.com Tue Jan 26 16:43:50 2016 From: ranchorobbo at gmail.com (Rob Atkinson) Date: Tue, 26 Jan 2016 15:43:50 -0600 Subject: [AMRadio] New ARRL CEO named Message-ID: The ARRL Board has voted unanimously to elect Tom Gallagher, NY2RF as CEO and Secretary, effective April 18th. Gallagher will join ARRL staff as CEO-Elect on February 29th. Rob K5UJ From w3slk at verizon.net Tue Jan 26 16:58:45 2016 From: w3slk at verizon.net (Mike Sawyer) Date: Tue, 26 Jan 2016 16:58:45 -0500 Subject: [AMRadio] New ARRL CEO named In-Reply-To: References: Message-ID: <000301d15884$bce97980$36bc6c80$@verizon.net> "....Meet the new boss. Same as the old boss......" The Who, 'We Won't Get Fooled Again' Mod-U-Lator, Mike(y)/W3SLK -----Original Message----- From: AMRadio [mailto:amradio-bounces at mailman.qth.net] On Behalf Of Rob Atkinson Sent: Tuesday, January 26, 2016 4:44 PM To: Boat Anchors List; Discussion of AM Radio in the Amateur Service Subject: [AMRadio] New ARRL CEO named The ARRL Board has voted unanimously to elect Tom Gallagher, NY2RF as CEO and Secretary, effective April 18th. Gallagher will join ARRL staff as CEO-Elect on February 29th. Rob K5UJ ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Archives: http://mailman.qth.net/pipermail/amradio/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio at mailman.qth.net To unsubscribe, send an email to amradio-request at mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to w3slk at verizon.net From w5jo at brightok.net Tue Jan 26 17:21:33 2016 From: w5jo at brightok.net (w5jo at brightok.net) Date: Tue, 26 Jan 2016 16:21:33 -0600 Subject: [AMRadio] Wanted Message-ID: Does anyone have a small 100 Kc crystal calibrator such as the Heath HRA-10-1 they would sell? Jim W5JO From jcaldwell at rbcos.com Wed Jan 27 09:27:45 2016 From: jcaldwell at rbcos.com (John P. Caldwell) Date: Wed, 27 Jan 2016 09:27:45 -0500 Subject: [AMRadio] WSTC / WNLK CT silent Message-ID: <003101d1590e$e3ef2590$abcd70b0$@rbcos.com> I have a nice RCA BTA-250M transmitter available. In its previous commercial life, it belonged to KJJQ 910 AM in Brookings, S.D. The BTA-250M has a pair of 813's modulating a pair of 813's in the final. The set is now on 1885 KHz. The power supply is single phase, either 120 or 240 VAC. Rated 250W RF output continuous minimum. This transmitter will easily move up to 75M with minor PA tuning mods. Pics and more info available, just send me an email. 73, John WD8INC Message: 4 Date: Tue, 26 Jan 2016 05:43:26 -0600 From: Rob Atkinson > To: Karl Zuk > Cc: "AMRadio at mailman.qth.net " > Subject: Re: [AMRadio] WSTC / WNLK CT silent Message-ID: > Content-Type: text/plain; charset=UTF-8 Any chance they have tube rigs they will want to let go? 73 Rob K5UJ On Mon, Jan 25, 2016 at 6:57 PM, Karl Zuk via AMRadio > wrote: > WSHU - Sacred Heart University's NPR network - has decided to silenceboth WNLK 1350 Norwalk, CT and WSTC 1400 Stamford, CT effective today.WSHU claimed that the combined listenership was about 900 people - not enough to sustain continued operation of the stations. These stations aresupposed to be for sale. > Karl Zuk Katonah, NY From k4kyv at charter.net Wed Jan 27 15:07:39 2016 From: k4kyv at charter.net (Donald Chester) Date: Wed, 27 Jan 2016 14:07:39 -0600 Subject: [AMRadio] Inverted V antenna In-Reply-To: References: <784522056.1049243.1453747259931.JavaMail.yahoo.ref@mail.yahoo.com> <784522056.1049243.1453747259931.JavaMail.yahoo@mail.yahoo.com> <000101d157a8$663b7570$32b26050$@charter.net> Message-ID: <002801d1593e$5f84d400$1e8e7c00$@charter.net> From: Jim Isbell, W5JAI [mailto:jim.isbell at gmail.com] > My proposal is shown it the two attachments. The JPG shows the actual location and the PDF shows the > dimensions. The orientation is NW to SE ie the house faces SW. Jim, Looking at the diagram, I see a couple of problems. Firstly, assuming you are making this a centre-fed dipole, the feed point appears to almost lie right on the metal roof. This would make it an extremely ineffective radiator. It needs to be elevated as high as possible; simply pull enough tension on the wire to get rid of the sag, to raise the feed point as high as it will go. It doesn?t matter that the dipole would be tilted somewhat, in fact some people do that intentionally to make their antenna a ?sloper?, which supposedly has some gain towards the low end, IIRC. Secondly, the only band that a tuner could take care of and still get usable RF to the antenna, would be 15m and perhaps 17m. A coax-fed dipole works well on odd harmonics, but becomes essentially a dummy load on even. Even with a tuner, it would still be a dummy load on 20m and 10m. This is the same problem as I posted earlier about the guy who wrote to QST (Jan 2016, p. 66) wondering why his SWR was sky-high on 20m after he had extended the lengths of the legs of his 20m dipole to make it a half-wave on 40m, but it worked OK on 40. Since you have a tuner and the two support structures that would appear to take as much pull as you could possibly exert (a telephone pole and a lighthouse), I would suggest using balanced open wire feedline and make it a half-wave dipole, and pull the antenna as tight as possible. The reduced weight of the OWL would make it all the more easy to pull out most of the sag, and with the OWL and tuner, you could use the antenna on 40m through 10m, and you might even get it to work pretty well on 75-80m. Don k4kyv From w7fe at cox.net Wed Jan 27 16:38:18 2016 From: w7fe at cox.net (Stu Willcox) Date: Wed, 27 Jan 2016 13:38:18 -0800 Subject: [AMRadio] Inverted V antenna In-Reply-To: References: <784522056.1049243.1453747259931.JavaMail.yahoo.ref@mail.yahoo.com> <784522056.1049243.1453747259931.JavaMail.yahoo@mail.yahoo.com> <000101d157a8$663b7570$32b26050$@charter.net> Message-ID: <13779465-1375-4D12-9D6B-435487B0526D@cox.net> I have had good results by supporting as much of the dipole as practical horizontally as high as possible, then letting the ends "droop" at an angle and securing them lower on the end support structures. This should be arranged symmetrically (such that the horizontal sections are of equal length, and the drooping ends are also of equal length). For instance, for several years I used the popular multiband 88 foot, 450-ohm window-line-fed dipole with 44 feet running horizontally and 22 feet on each end drooping at similar angles. Of course, some 'cut and try' adjustment of the feedline length was necessary to allow successful impedance matching on all bands using my balanced "tuner". W7FE Sent from my iPad > On Jan 27, 2016, at 12:07 PM, Donald Chester wrote: > > > > > > From: Jim Isbell, W5JAI [mailto:jim.isbell at gmail.com] > > > >> My proposal is shown it the two attachments. The JPG shows the actual location and the PDF shows the > >> dimensions. The orientation is NW to SE ie the house faces SW. > > > > Jim, > > > > Looking at the diagram, I see a couple of problems. > > > > Firstly, assuming you are making this a centre-fed dipole, the feed point appears to almost lie right on the metal roof. This would make it an extremely ineffective radiator. It needs to be elevated as high as possible; simply pull enough tension on the wire to get rid of the sag, to raise the feed point as high as it will go. It doesn?t matter that the dipole would be tilted somewhat, in fact some people do that intentionally to make their antenna a ?sloper?, which supposedly has some gain towards the low end, IIRC. > > > > Secondly, the only band that a tuner could take care of and still get usable RF to the antenna, would be 15m and perhaps 17m. A coax-fed dipole works well on odd harmonics, but becomes essentially a dummy load on even. Even with a tuner, it would still be a dummy load on 20m and 10m. This is the same problem as I posted earlier about the guy who wrote to QST (Jan 2016, p. 66) wondering why his SWR was sky-high on 20m after he had extended the lengths of the legs of his 20m dipole to make it a half-wave on 40m, but it worked OK on 40. > > > > Since you have a tuner and the two support structures that would appear to take as much pull as you could possibly exert (a telephone pole and a lighthouse), I would suggest using balanced open wire feedline and make it a half-wave dipole, and pull the antenna as tight as possible. The reduced weight of the OWL would make it all the more easy to pull out most of the sag, and with the OWL and tuner, you could use the antenna on 40m through 10m, and you might even get it to work pretty well on 75-80m. > > > > Don k4kyv > > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Archives: http://mailman.qth.net/pipermail/amradio/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Post: AMRadio at mailman.qth.net > To unsubscribe, send an email to amradio-request at mailman.qth.net with > the word unsubscribe in the message body. > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to w7fe at cox.net From karlzuk at yahoo.com Thu Jan 28 08:17:33 2016 From: karlzuk at yahoo.com (Karl Zuk) Date: Thu, 28 Jan 2016 13:17:33 +0000 (UTC) Subject: [AMRadio] WSTC / WNLK Not Dead Yet In-Reply-To: <13779465-1375-4D12-9D6B-435487B0526D@cox.net> References: <13779465-1375-4D12-9D6B-435487B0526D@cox.net> Message-ID: <821799241.1625722.1453987053540.JavaMail.yahoo@mail.yahoo.com> Since mid-day Wednesday, January 27th, WSTC 1400 Stamford and WNLK 1350 Norwalk have been broadcasting a simulcast of random 50s, 60s and 70s music. The only announcement you will hear is a top-of-hour lady's voice legal ID over-riding the music. It sounds like a very random iTunes shuffle. You'll hear some very interesting segues like Wooly Bully into Jesus Christ Superstar. Wednesday afternoon I heard a bizarre Smurfs song air for about a minute. It must have been intolerable at the station, too. Someone abruptly advanced the playlist to Anne Murray's 'Snowbird.' Quite a few Elvis classics are played. This suggests they are keeping the fireplace warm to encourage potential new owners. It really is 'all music - all the time' at least for the moment. From karlzuk at yahoo.com Thu Jan 28 08:17:33 2016 From: karlzuk at yahoo.com (Karl Zuk) Date: Thu, 28 Jan 2016 13:17:33 +0000 (UTC) Subject: [AMRadio] WSTC / WNLK Not Dead Yet In-Reply-To: <13779465-1375-4D12-9D6B-435487B0526D@cox.net> References: <13779465-1375-4D12-9D6B-435487B0526D@cox.net> Message-ID: <821799241.1625722.1453987053540.JavaMail.yahoo@mail.yahoo.com> Since mid-day Wednesday, January 27th, WSTC 1400 Stamford and WNLK 1350 Norwalk have been broadcasting a simulcast of random 50s, 60s and 70s music. The only announcement you will hear is a top-of-hour lady's voice legal ID over-riding the music. It sounds like a very random iTunes shuffle. You'll hear some very interesting segues like Wooly Bully into Jesus Christ Superstar. Wednesday afternoon I heard a bizarre Smurfs song air for about a minute. It must have been intolerable at the station, too. Someone abruptly advanced the playlist to Anne Murray's 'Snowbird.' Quite a few Elvis classics are played. This suggests they are keeping the fireplace warm to encourage potential new owners. It really is 'all music - all the time' at least for the moment. From steinerviolinist at gmail.com Thu Jan 28 15:07:51 2016 From: steinerviolinist at gmail.com (Oliver Steiner) Date: Thu, 28 Jan 2016 15:07:51 -0500 Subject: [AMRadio] Thordarson T-19M17 Message-ID: Fellow AMers, I have a Thordarson T-19M17 Modulation transformer. I have the literature which tells me which terminals to connect to for my particular tubes and class C load. However ***which terminal number goes with each of the unlabeled terminals??*** There are 4 horizontal rows with 3 terminals on each row. Is terminal #1 the upper left terminal?? Does it then go left to right: 1,2,3 in the top row, 4,5,6 in the 2nd row etc.?? I have a hand written diagram (by someone who previously used this transformer) which looks really strange.-It shows the top horizontal row as being terminal numbers 7,9,12. Going by this possibly erroneous info, I'm not getting B+ to the final amp, so I think this strange numbering must be wrong. I would be most grateful to receive the correct info. 73, Ollie W2QXR -- http://oliversteiner.com From ne1s at securespeed.us Thu Jan 28 15:33:33 2016 From: ne1s at securespeed.us (Larry Szendrei) Date: Thu, 28 Jan 2016 15:33:33 -0500 Subject: [AMRadio] Thordarson T-19M17 In-Reply-To: References: Message-ID: <56AA7B1D.1050701@securespeed.us> On 1/28/16 3:07 PM, Oliver Steiner wrote: > Fellow AMers, > > I have a Thordarson T-19M17 Modulation transformer. I have the > literature which tells me which terminals to connect to for my > particular tubes and class C load. However ***which terminal number > goes with each of the unlabeled terminals??*** There are 4 horizontal > rows with 3 terminals on each row. Is terminal #1 the upper left > terminal?? Does it then go left to right: 1,2,3 in the top row, 4,5,6 > in the 2nd row etc.?? I have a hand written diagram (by someone who > previously used this transformer) which looks really strange.-It shows > the top horizontal row as being terminal numbers 7,9,12. Going by this > possibly erroneous info, I'm not getting B+ to the final amp, so I > think this strange numbering must be wrong. I would be most grateful > to receive the correct info. > > Hi Ollie, I'd think you should be able to figure it out with the literature you have, and an ohmmeter. 73, -Larry/NE1S From ars.w5omr at gmail.com Thu Jan 28 23:22:40 2016 From: ars.w5omr at gmail.com (Geoff) Date: Thu, 28 Jan 2016 22:22:40 -0600 Subject: [AMRadio] Inverted V antenna In-Reply-To: <004401d1579c$6286a140$2793e3c0$@charter.net> References: <56A5810A.8000400@securespeed.us> <000a01d1572f$1ce64ef0$56b2ecd0$@charter.net> <004401d1579c$6286a140$2793e3c0$@charter.net> Message-ID: <56AAE910.6040609@gmail.com> On 01/25/2016 12:15 PM, Donald Chester wrote: > The ?cone of silence? of the null off the ends of a horizontal half-wave dipole is very narrow (or maybe ?skinny? would be a better word), meaning it is limited to a very small range of vertical take-off angles, as well as horizontal coverage. For all practical purposes, a dipole, whether truly horizontal or inverted-vee, can be considered omni-directional, particularly on the 160m, 80m and 40m bands. The broadside advantage and end nulls are something blown way out of proportion in amateur radio lore, just like SWR. > > > > ?One frequently sees a dipole azimuth pattern depicting a very sharp null off of the ends of a dipole. While technically accurate, this can be very misleading ... and is a result of trying to depict a 3 dimensional pattern in 2 dimensions. **This often seen null is only evident at the same launch angle as the maximum broadside gain**. Of major significance is the large amount of gain off the ends at higher launch angles. Due to multiple lobes forming above ? wavelength, this is not easily shown in tabular form.? Say what you will, but my experience was similar to Jim's. My first antenna, a 75m Inverted V in San Antonio, TX, was broad-side WNW by ESE. (city lot - 120'd x 60'w, long North and South). Working stations in Austin and Dallas, like WD5JKO and WA5CMI vs the likes of K5SWK and W5PYT, Otis and Bob were rock-solid 40db+ signals, 90% of the time, whereas comparable stations North and South were never quite as strong. 2 things happened to change that original Inverted V into a more omni-directional pattern; 1) adding open-wire line as feedline in place of RG-8 2) Closing in the bottom of the 'V', and making a full-wave delta loop, fed at the original apex of the 'V', in the vertical plane. I never lost anything East and West, but North and South stations were very similar in strength. Bonus: My typical S-7~9 noise-level dropped down to S-2, typical. I remember the day I closed in the bottom of the V and made it a loop, I worked K5SWK and K5BAI and received higher-than-normal reports from them, while they, for the first time, were equal (pretty much) in strength. Jim/BAI, in Dallas, was probably about 50 miles further away than Otis was in Grangerland. I've been sold on loops, ever since. Of course, open-wire for feed-line was decided on after lengthy discussions on the subject with John/WA5BXO. I've lived in 3 places in the Houston area now, in the last nearly 8 years, the first being an apartment for 3 year (no antennas) and two houses. First house had a 4-sided, square, horizontal loop, fed in the middle of one leg. Results were mediocre, I guess ... nothing spectacular to talk of. I mean, the rigs loaded fine into it, and signals were 'ok', but there was always a local 'noise' at that location that ... just didn't seem to make radioing 'fun' ... At this house in Splendora, TX (about 10 miles East of where K5SWK's xmtr was located) another horizontal, square loop, instead fed with the same home-brewed open-wire line, but this time fed on a corner of the loop, and *BAM*, it's like hitting a nail on it's head from 200 miles away. Noise is gone, Signals are -HIGH- and signal reports are astonishing! So, my experience tells me, that If you've got room enough for an inverted V on 75m, you've got room for a Delta Loop. Just get the apex up ~1/4w above ground. Hmmm ... I strayed, didn't I? ;-) The point is, go ahead and run the math, do the calculations, get the 'free-space' answers, but you're not going to be able to accurately predict what's going to happen in any given practical "real-world" application. What 'should be' and 'what is' are very often two different things. 73 = Best Regards, -Geoff/W5OMR From ars.w5omr at gmail.com Thu Jan 28 23:29:45 2016 From: ars.w5omr at gmail.com (Geoff) Date: Thu, 28 Jan 2016 22:29:45 -0600 Subject: [AMRadio] Inverted V antenna In-Reply-To: <004401d1579c$6286a140$2793e3c0$@charter.net> References: <56A5810A.8000400@securespeed.us> <000a01d1572f$1ce64ef0$56b2ecd0$@charter.net> <004401d1579c$6286a140$2793e3c0$@charter.net> Message-ID: <56AAEAB9.4040002@gmail.com> I might also add, that it was -after- the antenna modification at the house in San Antonio, that I was able to work further out stations of 75m AM pop-fame, in teh form of one K4KYV (ex W(?)Jock-Strap) and WA1Henry Yellar Radio... stations that, until the antenna change, would float on top of and below the noise floor and I was -never- heard... From paul at paulbaldock.com Sat Jan 30 20:31:21 2016 From: paul at paulbaldock.com (Paul Baldock) Date: Sat, 30 Jan 2016 17:31:21 -0800 Subject: [AMRadio] Modulator question Message-ID: I'm building a modulator using two EL34s. I am testing it in to a matched resistive load. The output between 30% and 100% of max (50Watts) gets quite distorted. Driving with a sine wave the grids look good, but the output starts to get more triangular the harder you push it. FYI the plate voltage is about 660V and the screen tapped at around half of that. Any thoughts from you audio buffs? - Paul KW7Y --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus From ranchorobbo at gmail.com Sat Jan 30 22:39:21 2016 From: ranchorobbo at gmail.com (Rob Atkinson) Date: Sat, 30 Jan 2016 21:39:21 -0600 Subject: [AMRadio] Modulator question In-Reply-To: <20160131013659.1DAD9149B621@mailman.qth.net> References: <20160131013659.1DAD9149B621@mailman.qth.net> Message-ID: By "triangular" you mean something like a sawtooth? Do you hear distortion or are you only viewing it? Sometimes the scope pick up is the problem and the circuit under test will turn out to be okay. However, that's probably more likely with RF. 73 Rob K5UJ On Sat, Jan 30, 2016 at 7:31 PM, Paul Baldock wrote: > I'm building a modulator using two EL34s. > > I am testing it in to a matched resistive load. The output between 30% and > 100% of max (50Watts) gets quite distorted. Driving with a sine wave the > grids look good, but the output starts to get more triangular the harder you > push it. FYI the plate voltage is about 660V and the screen tapped at > around half of that. > > Any thoughts from you audio buffs? > > - Paul KW7Y > > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Archives: http://mailman.qth.net/pipermail/amradio/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Post: AMRadio at mailman.qth.net > To unsubscribe, send an email to amradio-request at mailman.qth.net with > the word unsubscribe in the message body. > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to ranchorobbo at gmail.com From jcandela at prodigy.net Sun Jan 31 00:15:08 2016 From: jcandela at prodigy.net (Jim Candela) Date: Sun, 31 Jan 2016 05:15:08 +0000 (UTC) Subject: [AMRadio] Modulator question In-Reply-To: References: Message-ID: <283078203.2654641.1454217308375.JavaMail.yahoo@mail.yahoo.com> Paul, ?? In addition to Rob's questions, there are a lot of things to consider. You mentioned that the screens are tapped off at 1/2 the B+. The screen current will rise non linearly with grid drive excitation, and if you are using a voltage divider for the screens, then the screen voltage will dip noticeably when cranking up the power. Perhaps try bypassing the screen tap with a bypass capacitor, like 50 mfd or so. With low duty cycle speech instead of a sine wave, that simple change can help. ?? How are you biasing those tubes? Is this class Ab1 or Ab2? With Ab2 there will be grid current on voice peaks. ?? Another factor is plate to plate load impedance. If the load is too low, then the tube will labor to produce power. Sometimes if the transformer turns ratio is fixed, then adding two more tubes will work better; i.e. a quad of EL-34's in push pull parallel. ? Does the plate voltage droop much as you crank up the power? JimWd5JKO On Saturday, January 30, 2016 9:39 PM, Rob Atkinson wrote: By "triangular" you mean something like a sawtooth?? Do you hear distortion or are you only viewing it?? Sometimes the scope pick up is the problem and the circuit under test will turn out to be okay. However, that's probably more likely with RF. 73 Rob K5UJ On Sat, Jan 30, 2016 at 7:31 PM, Paul Baldock wrote: > I'm building a modulator using two EL34s. > > I am testing it in to a matched resistive load. The output between 30% and > 100% of max (50Watts) gets quite distorted. Driving with a sine wave the > grids look good, but the output starts to get more triangular the harder you > push it.? FYI the plate voltage is about 660V and the screen tapped at > around half of that. > > Any thoughts from you audio buffs? > > - Paul? KW7Y > > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Archives: http://mailman.qth.net/pipermail/amradio/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Post: AMRadio at mailman.qth.net > To unsubscribe, send an email to amradio-request at mailman.qth.net with > the word unsubscribe in the message body. > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to ranchorobbo at gmail.com ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Archives: http://mailman.qth.net/pipermail/amradio/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio at mailman.qth.net To unsubscribe, send an email to amradio-request at mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to jcandela at prodigy.net From paul at paulbaldock.com Sun Jan 31 01:12:59 2016 From: paul at paulbaldock.com (Paul Baldock) Date: Sat, 30 Jan 2016 22:12:59 -0800 Subject: [AMRadio] Modulator question In-Reply-To: <283078203.2654641.1454217308375.JavaMail.yahoo@mail.yahoo. com> References: <283078203.2654641.1454217308375.JavaMail.yahoo@mail.yahoo.com> Message-ID: At 09:15 PM 1/30/2016, Jim Candela wrote: >power. Perhaps try bypassing the screen tap with a bypass capacitor, >like 50 mfd or so. It's bipased with 390uF > How are you biasing those tubes? Is this class Ab1 AB1., with adjustable bias set at 25mA per tube quiescent. > Another factor is plate to plate load impedance. I am matching the impedance correctly > Does the plate voltage droop much as you crank up the power? maybe 30V in 660V More experimenting tomorrow !! Thanks - Paul --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus From Tonne at Comcast.net Sun Jan 31 07:30:34 2016 From: Tonne at Comcast.net (Jim Tonne) Date: Sun, 31 Jan 2016 07:30:34 -0500 Subject: [AMRadio] Modulator question In-Reply-To: <20160131061327.3BE41149B226@mailman.qth.net> References: <283078203.2654641.1454217308375.JavaMail.yahoo@mail.yahoo.com> <20160131061327.3BE41149B226@mailman.qth.net> Message-ID: <56ADFE6A.8080309@Comcast.net> If the screen voltage is derived from a tap on the primary on the output transformer, NO bypass to ground from the screen. The dead giveaway on that is the triangular waveform appearance. That means the load is capacitive and this can be caused by a capacitance somewhere, either on the secondary or the primary. Remove the capacitor from each of the screens to ground. - Jim Tonne W4ENE On 1/31/2016 1:12 AM, Paul Baldock wrote: > At 09:15 PM 1/30/2016, Jim Candela wrote: >> power. Perhaps try bypassing the screen tap with a bypass capacitor, >> like 50 mfd or so. > > It's bipased with 390uF > From jcaldwell at rbcos.com Sun Jan 31 09:17:21 2016 From: jcaldwell at rbcos.com (John P. Caldwell) Date: Sun, 31 Jan 2016 09:17:21 -0500 Subject: [AMRadio] Thordarson T-19M17 Message-ID: <006801d15c32$19a66330$4cf32990$@rbcos.com> On 1/28/16 3:07 PM, Oliver Steiner wrote: > Fellow AMers, > > I have a Thordarson T-19M17 Modulation transformer. I have the > literature which tells me which terminals to connect to for my > particular tubes and class C load. However ***which terminal number > goes with each of the unlabeled terminals??*** There are 4 horizontal > rows with 3 terminals on each row. Is terminal #1 the upper left > terminal?? Does it then go left to right: 1,2,3 in the top row, 4,5,6 > in the 2nd row etc.?? I have a hand written diagram (by someone who > previously used this transformer) which looks really strange.-It shows > the top horizontal row as being terminal numbers 7,9,12. Going by this > possibly erroneous info, I'm not getting B+ to the final amp, so I > think this strange numbering must be wrong. I would be most grateful > to receive the correct info. > There are probably additional numbered leads in addition to those you can see, under the end bells. You can contact Thordarson at 702-566-0800 and they'll help you out. 73, John WD8INC From steinerviolinist at gmail.com Sun Jan 31 10:32:40 2016 From: steinerviolinist at gmail.com (Oliver Steiner) Date: Sun, 31 Jan 2016 10:32:40 -0500 Subject: [AMRadio] Thordarson T-19M17 In-Reply-To: <006801d15c32$19a66330$4cf32990$@rbcos.com> References: <006801d15c32$19a66330$4cf32990$@rbcos.com> Message-ID: Hi John, Thank you for your reply and for the Thordarson phone number. Some time ago I did indeed call Thordarson. They said they didn't know, but would look it up it some archive. They never got back to me. The good news, however is that I asked my Thordarson question also on a Facebook Amplitude Modulation group the other day, and a kind gentleman sent me a photograph of his transformer with numbers on the terminals. The bizarre numbering (top row left to right is: "7, 9, 12" ! ) coincided with the hand written diagram I had from the guy who used the transformer in his 1942 rig! So I will go over my modulator wiring and am hopeful that I'll get it working in the near future. 73, Ollie W2QXR On 1/31/16, John P. Caldwell wrote: > On 1/28/16 3:07 PM, Oliver Steiner wrote: > >> Fellow AMers, > >> > >> I have a Thordarson T-19M17 Modulation transformer. I have the > >> literature which tells me which terminals to connect to for my > >> particular tubes and class C load. However ***which terminal number > >> goes with each of the unlabeled terminals??*** There are 4 horizontal > >> rows with 3 terminals on each row. Is terminal #1 the upper left > >> terminal?? Does it then go left to right: 1,2,3 in the top row, 4,5,6 > >> in the 2nd row etc.?? I have a hand written diagram (by someone who > >> previously used this transformer) which looks really strange.-It shows > >> the top horizontal row as being terminal numbers 7,9,12. Going by this > >> possibly erroneous info, I'm not getting B+ to the final amp, so I > >> think this strange numbering must be wrong. I would be most grateful > >> to receive the correct info. > >> > > > > > > There are probably additional numbered leads in addition to those you can > see, under the end bells. You can contact Thordarson at 702-566-0800 and > they'll help you out. > > > > 73, > > John > > WD8INC > > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Archives: http://mailman.qth.net/pipermail/amradio/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Post: AMRadio at mailman.qth.net > To unsubscribe, send an email to amradio-request at mailman.qth.net with > the word unsubscribe in the message body. > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to steinerviolinist at gmail.com > -- http://oliversteiner.com From paul at paulbaldock.com Sun Jan 31 10:38:46 2016 From: paul at paulbaldock.com (Paul Baldock) Date: Sun, 31 Jan 2016 07:38:46 -0800 Subject: [AMRadio] Modulator question In-Reply-To: <56ADFE6A.8080309@Comcast.net> References: <283078203.2654641.1454217308375.JavaMail.yahoo@mail.yahoo.com> <20160131061327.3BE41149B226@mailman.qth.net> <56ADFE6A.8080309@Comcast.net> Message-ID: The screen is not tapped on the mod tranny. It is pure DC. at about half the plate voltage. I think however the issue may be related to the screen, because in a typical EL34 output the screen is run at the same voltage as the plate. I did not do this because my plate voltage is about 660V. I will try upping the screen voltage (and readjusting the bias of course) Thanks - Paul At 04:30 AM 1/31/2016, Jim Tonne wrote: >If the screen voltage is derived from a tap on the primary >on the output transformer, NO bypass to ground from the >screen. The dead giveaway on that is the triangular >waveform appearance. That means the load is capacitive >and this can be caused by a capacitance somewhere, >either on the secondary or the primary. > >Remove the capacitor from each of the screens to ground. > >- Jim Tonne W4ENE > > > >On 1/31/2016 1:12 AM, Paul Baldock wrote: >>At 09:15 PM 1/30/2016, Jim Candela wrote: >>>power. Perhaps try bypassing the screen tap with a bypass >>>capacitor, like 50 mfd or so. >> >>It's bipased with 390uF > >______________________________________________________________ >Our Main Website: http://www.amfone.net >AMRadio mailing list >Archives: http://mailman.qth.net/pipermail/amradio/ >List Rules (must read!): http://w5ami.net/amradiofaq.html >List Home: http://mailman.qth.net/mailman/listinfo/amradio >Post: AMRadio at mailman.qth.net >To unsubscribe, send an email to amradio-request at mailman.qth.net with >the word unsubscribe in the message body. > >This list hosted by: http://www.qsl.net >Please help support this email list: http://www.qsl.net/donate.html >Message delivered to paul at paulbaldock.com --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

This page last updated 17 Oct 2017.