From kenw8ek at gmail.com Sat Dec 13 12:59:27 2014 From: kenw8ek at gmail.com (Ken Simpson, W8EK) Date: Sat, 13 Dec 2014 12:59:27 -0500 Subject: [AMRadio] VHF and UHF antennas and related items FS Message-ID: <548C7E7F.3030408@gmail.com> VHF and UHF Antenna related items For Sale: Mobile Antenna Mounts: Larsen LM-MM Mag Mount This rectangular mag mount features an extremely strong magnet. The center of the mag mount takes an Larsen LM type antenna (5/16 inch stud). It includes coax for $18. Round NMO Mag Mount Black, 4 + inches in diameter, with coax. $24 BNC Mag Mount Has BNC connector on the mag mount so you can add the rubber duck from your HT. Coax has BNC connector for your HT. It permits one to get the HT rubber duck out of the car for better performance. $22 Trunk Lip Mount 3/8 inch 24 thread stud, with coax. $10 Round Mag Mount for "Antenna Specialists" antenna It uses the sort of reversed PL-259 type antenna that was used for many years by Antenna Specialists. With coax for $10. Round Mag Mount has 5/16 inch threaded connection, with coax $10. White Round Mag Mount 1/4 inch threaded connection, with coax for $10. Astatic "Mirror Mount" or "Roof Rack Mount" Mounts to mirror or roof rack, and takes a PL-259 on one side, and has a 3/8 inch 24 post for the mobile whip on the other. Used for either HF or VHF/UHF antennas. New, still sealed in the package. $12 As above, unused, but out of package. $10 Antenna Specialists Antenna Mounting Hardware: All of the following Antenna Specialists hardware is NEW, unused, still in their original boxes, with original paper work. HM-66 Gutter Clip Mount This gutter clip takes a standard 3/8 inch 24 thread antenna. It includes coax. It is suitable for VHF/UHF antennas, but is not rugged enough for HF antennas. NEW $15 K-221 NMO Trunk Lip Mount This takes any of the NMO VHF or UHF type antennas. It is a nice trunk lip mount, complete with coax. NEW $15 K-66 NMO Hole Mount This takes any of the NMO type antennas. It is made to mount in a 3/4 inch diameter hole, and includes coax. NEW $15 M-3 Ball Mount This is a standard, heavy duty ball, suitable for use with HF antennas, or VHF antennas requiring a 3/8 inch, 24 thread antenna. NEW $15 ASC-3D Heavy Duty Ball Mount Extremely heavy duty, Chrome plated, for 3/8-24 antennas. NEW $28 Mobile Antenna Springs: These mobile antenna springs appear to be new. They are the chrome plated type, and designed for light to medium duty use, i.e. use on VHF type antennas, and not for heavy duty HF use. These are about 3 inches long. I have some that are for 1/4 inch diameter antenna mounts, some for 5/16, and some for 3/8 inch. Please let me know what size you need. These appear to be new, or at least unused. They are $5 each. Dual Band 2 m / 440 MHz Mag Mount Antenna: This antenna has a very strong mag mount. The antenna itself is a quarter wave antenna on 2 meters (unity gain), and provides a couple db gain on 440 MHz. It seems to be very rugged, and even has extra strain relief on the PL-259 coax connector. It is about 20 inches tall, including the mag mount. This particular antenna appears to be new, unused. It is the black color (not silver). $30 Hustler UHT-1, VHF / UHF mobile antenna: The Hustler UHT-1 is 1/4 Wave Hole Mount Antenna. It can be cut for any frequency from 136 to 500 MHz. It is low profile, with a 3/4" hole required. Includes 15' coax and connector, and is rated to handle up to 200 Watts of power. This particular antenna is new, still sealed in its original shrink wrap package. $15 Larsen mobile antennas for NLA Mounts: Both of these fit the Larsen NLA mounts. Larsen NLA-150 This antenna provides about 3 db gain over a quarter wave, and is a very rugged antenna, about 4 feet long. In very good condition, it the fits Larsen NLA mounts. Coil only $10 Coil with whip $17 Larsen NLA-UHF coil for 440 MHz This is the coil only for NLA mounts, for use on the amateur 440 MHz band and UHF public service bands. Good condition. $10 Cushcraft 4 element 124 WB, 2 meter beam: The Cushcraft 124WB is a 4 element wideband boomer for 2 meters. It is the right choice for packet systems and other applications requiring a dedicated directional antenna. 124WB Specifications: Frequency: 144-148 MHz Elements: 4 Gain: 10.2 dBi Front To Back Ratio: 19 dB VSWR 2:1 Bandwidth: 4 MHz. Power: 2000 watts PEP Longest Element: 41 inches (1.04 m) Turning Radius: 8.8 Ft. (2.7 m) Boom Length: 4 Ft. (1.22 m) Wind Surface: 0.34 sq. feet Connector: UHF (SO239) Weight: 3 Lbs (1.6 kg) This one is in extremely nice shape. No corrosion. Only $75. Coaxial Antenna Switches: All work fine, look fine, and use SO-239 connectors. B & W Model 550 A Coax Switch This model will switch up to 5 antennas, and does NOT ground unused antennas. Coax comes out the side, like spokes of a wheel. It will handle the full legal limit. $35 SCP Comm Switch SC-40-AS Coax Switch Three position antenna switch in rectangular box. Connectors on the back. In original box. May be new. $24 Two position "Strip Line" Coax Switches: These switches utilize metal cavity construction for max efficiency and high isolation. Isolation is better than 50 dB at 300 MHz with low insertion loss less. All are two position and are typically rated for 2500 W PEP, and good to 600 MHz. Diawa CS-201 - $20 Opek CX-201 - $20 MFJ 1702 C - With center position that grounds both antennas, and added lightning protection. $25 Antennas for your HT: All rubber ducks are for 2 meters, are in good condition, and are $10 each, unless stated otherwise. BNC - Dual Band (2 m and 440 MHz) Telescoping antenna provides significant gain when extended, $18 BNC - As used on most HTs, 7 inches long BNC - Original Alinco EA0024, about 4 inches long BNC - Original from Kenwood TH-215, about 5 inches long BNC - "Stubby" about 4 1/2 inches long Type F connector - 6.5 inches long BNC Stubby for 440 MHz, 3 inches long Threaded (as used by Motorola, etc.) stubby for 440 MHz Not a Rubber Duck, but can be used on your HT: Telescoping Antenna w/ BNC about 19 inches long can be used as a quarter wave antenna on 2 m, or on 220, or 450 MHz if telescoped shorter. $12 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, HF linear amplifiers, and many other accessories. Just too many to list here. Please e-mail your requests. Prices do not include shipping from Florida. Thanks. 73, Ken, W8EK Ken Simpson E-mail to W8EK at FLHam.net or W8EK at arrl.net Voice Phone (352) 732-8400 From w2xj at w2xj.net Sat Dec 13 13:30:51 2014 From: w2xj at w2xj.net (W2xj) Date: Sat, 13 Dec 2014 11:30:51 -0700 Subject: [AMRadio] Crystals In-Reply-To: <20141209133051.UoK89qch@smtp14.mail.yandex.net> References: <1418110910.99077.YahooMailBasic@web125604.mail.ne1.yahoo.com> <20141209133051.UoK89qch@smtp14.mail.yandex.net> Message-ID: Does anyone know who, if anyone, still makes custom crystals? From hamfish at efn.org Sat Dec 13 14:09:21 2014 From: hamfish at efn.org (Craig Heaton) Date: Sat, 13 Dec 2014 11:09:21 -0800 Subject: [AMRadio] [R-390] Crystals In-Reply-To: References: <1418110910.99077.YahooMailBasic@web125604.mail.ne1.yahoo.com> <20141209133051.UoK89qch@smtp14.mail.yandex.net> Message-ID: <000301d01708$70897c20$519c7460$@org> International Crystal still does. The package may be different, but the pin diameter and spacing is the same. Pricey! Craig, -----Original Message----- From: R-390 [mailto:r-390-bounces at mailman.qth.net] On Behalf Of W2xj Sent: Saturday, December 13, 2014 10:31 AM To: amradio at mailman.qth.net Cc: 390 list Subject: [R-390] Crystals Does anyone know who, if anyone, still makes custom crystals? ______________________________________________________________ R-390 mailing list Home: http://mailman.qth.net/mailman/listinfo/r-390 Help: http://mailman.qth.net/mmfaq.htm Post: mailto:R-390 at mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html From w5jo at brightok.net Sat Dec 13 15:22:07 2014 From: w5jo at brightok.net (Jim Wilhite) Date: Sat, 13 Dec 2014 14:22:07 -0600 Subject: [AMRadio] Crystals In-Reply-To: References: <1418110910.99077.YahooMailBasic@web125604.mail.ne1.yahoo.com><20141209133051.UoK89qch@smtp14.mail.yandex.net> Message-ID: <7D575767064543648C8E4A7672652808@JimPC> I hope you don't run into the expensive option. Sometime back I inquired about a 100 Kc crystal for a calibrator. ICM has the cut for the Collins calibrator in stock for ~$30 (I think it was) but if you wanted a cut different than the stock version, the cost run up around $100. It is certainly worth calling them to inquire but you may run into that. Jim W5JO -----Original Message----- From: W2xj Does anyone know who, if anyone, still makes custom crystals? From rbethman at comcast.net Sat Dec 13 15:30:36 2014 From: rbethman at comcast.net (rbethman) Date: Sat, 13 Dec 2014 15:30:36 -0500 Subject: [AMRadio] Crystals In-Reply-To: <7D575767064543648C8E4A7672652808@JimPC> References: <1418110910.99077.YahooMailBasic@web125604.mail.ne1.yahoo.com><20141209133051.UoK89qch@smtp14.mail.yandex.net> <7D575767064543648C8E4A7672652808@JimPC> Message-ID: <548CA1EC.6060806@comcast.net> I do have a couple of Heathkit calibrator crystals out of Mohawks. Also have the calibrator module out of a Halli SX-101MkIII. Contact direct. Regards, Bob - N0DGN On 12/13/2014 3:22 PM, Jim Wilhite wrote: > I hope you don't run into the expensive option. Sometime back I > inquired about a 100 Kc crystal for a calibrator. ICM has the cut for > the Collins calibrator in stock for ~$30 (I think it was) but if you > wanted a cut different than the stock version, the cost run up around > $100. > > It is certainly worth calling them to inquire but you may run into that. > > Jim > W5JO From w2xj at w2xj.net Sat Dec 13 15:52:43 2014 From: w2xj at w2xj.net (W2xj) Date: Sat, 13 Dec 2014 13:52:43 -0700 Subject: [AMRadio] [R-390] Crystals In-Reply-To: <000301d01708$70897c20$519c7460$@org> References: <1418110910.99077.YahooMailBasic@web125604.mail.ne1.yahoo.com> <20141209133051.UoK89qch@smtp14.mail.yandex.net> <000301d01708$70897c20$519c7460$@org> Message-ID: Are sure they still do this? Someone on another list says he called and they said they don't do it anymore. Insight????? Sent from my iPhone > On Dec 13, 2014, at 12:09 PM, Craig Heaton wrote: > > International Crystal still does. The package may be different, but the pin > diameter and spacing is the same. Pricey! > > Craig, > > -----Original Message----- > From: R-390 [mailto:r-390-bounces at mailman.qth.net] On Behalf Of W2xj > Sent: Saturday, December 13, 2014 10:31 AM > To: amradio at mailman.qth.net > Cc: 390 list > Subject: [R-390] Crystals > > Does anyone know who, if anyone, still makes custom crystals? > ______________________________________________________________ > R-390 mailing list > Home: http://mailman.qth.net/mailman/listinfo/r-390 > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:R-390 at mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > From manualman at juno.com Sat Dec 13 16:38:47 2014 From: manualman at juno.com (manualman at juno.com) Date: Sat, 13 Dec 2014 16:38:47 -0500 Subject: [AMRadio] [R-390] Crystals Message-ID: See http://www.icmfg.com/generalfaqs.html And http://www.icmfg.com/hamradio.html Pete, wa2cwa On Sat, 13 Dec 2014 13:52:43 -0700 W2xj writes: > Are sure they still do this? Someone on another list says he called > and they said they don't do it anymore. Insight????? > > Sent from my iPhone > > > On Dec 13, 2014, at 12:09 PM, Craig Heaton > wrote: > > > > International Crystal still does. The package may be different, > but the pin > > diameter and spacing is the same. Pricey! > > > > Craig, > > > > -----Original Message----- > > From: R-390 [mailto:r-390-bounces at mailman.qth.net] On Behalf Of > W2xj > > Sent: Saturday, December 13, 2014 10:31 AM > > To: amradio at mailman.qth.net > > Cc: 390 list > > Subject: [R-390] Crystals > > > > Does anyone know who, if anyone, still makes custom crystals? From w5jo at brightok.net Sat Dec 13 17:20:09 2014 From: w5jo at brightok.net (Jim Wilhite) Date: Sat, 13 Dec 2014 16:20:09 -0600 Subject: [AMRadio] [R-390] Crystals In-Reply-To: References: <1418110910.99077.YahooMailBasic@web125604.mail.ne1.yahoo.com><20141209133051.UoK89qch@smtp14.mail.yandex.net><000301d01708$70897c20$519c7460$@org> Message-ID: <32621CDA5D4449FA835FB2852D4BA66D@JimPC> ICM will, but if it is a non-stocked item the cost goes up. A third overtone crystal will cost much more than a fundamental. You just need to call. Jim W5JO -----Original Message----- Are sure they still do this? Someone on another list says he called and they said they don't do it anymore. Insight????? Sent from my iPhone > On Dec 13, 2014, at 12:09 PM, Craig Heaton wrote: > > International Crystal still does. The package may be different, but the > pin > diameter and spacing is the same. Pricey! > > Craig, > > -----Original Message----- > From: R-390 [mailto:r-390-bounces at mailman.qth.net] On Behalf Of W2xj > Sent: Saturday, December 13, 2014 10:31 AM > To: amradio at mailman.qth.net > Cc: 390 list > Subject: [R-390] Crystals > > Does anyone know who, if anyone, still makes custom crystals? > ______________________________________________________________ From amradio at mailman.qth.net Sat Dec 13 18:44:03 2014 From: amradio at mailman.qth.net (CL in NC via AMRadio) Date: Sat, 13 Dec 2014 15:44:03 -0800 Subject: [AMRadio] Crystals In-Reply-To: Message-ID: <1418514243.53491.YahooMailBasic@web160604.mail.bf1.yahoo.com> ICM gives a discount for multiple rocks. If several in need pool their wants with one person acting as liaison, you can save quite a bit. Charlie, W4MEC in NC From ranchorobbo at gmail.com Sat Dec 13 18:53:42 2014 From: ranchorobbo at gmail.com (Rob Atkinson) Date: Sat, 13 Dec 2014 17:53:42 -0600 Subject: [AMRadio] Crystals In-Reply-To: <1418514243.53491.YahooMailBasic@web160604.mail.bf1.yahoo.com> References: <1418514243.53491.YahooMailBasic@web160604.mail.bf1.yahoo.com> Message-ID: 1. How recent is the ICM information folks are giving? Did someone order a few days ago, or is this information that's 5 years old? These days source information has a shelf life. 2. What kinds of crystals are we talking about? I mean, if I want a REAL rock, like a FT243 or bigger slab for say, 3880, will they supply that? Or are we only talking about skinny wafers that go on a PC board? tnx 73 Rob K5UJ From hallicrafterssr2000 at k9axn.com Sat Dec 13 19:48:05 2014 From: hallicrafterssr2000 at k9axn.com (Jim Liles) Date: Sat, 13 Dec 2014 18:48:05 -0600 Subject: [AMRadio] Crystals In-Reply-To: References: <1418514243.53491.YahooMailBasic@web160604.mail.bf1.yahoo.com> Message-ID: Hi Rob, I have purchased some exotic crystals from them as recently as two weeks ago. They bend over backward to provide what you?re looking for. Case and point. I need 36mc hc49 fundamental AT cut crystals. They agreed to make them which is more that most will do for you. Their common crystals cost about $25.00. I?ve tested the Chinese market and they are dirt cheap but minimum orders are 1000 pcs and there is a terrible language barrier --- not sure what you get will be right. Kindest regards Jim K9AXN -----Original Message----- From: Rob Atkinson Sent: Saturday, December 13, 2014 5:53 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] Crystals 1. How recent is the ICM information folks are giving? Did someone order a few days ago, or is this information that's 5 years old? These days source information has a shelf life. 2. What kinds of crystals are we talking about? I mean, if I want a REAL rock, like a FT243 or bigger slab for say, 3880, will they supply that? Or are we only talking about skinny wafers that go on a PC board? tnx 73 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 From w5jo at brightok.net Sat Dec 13 19:56:52 2014 From: w5jo at brightok.net (Jim Wilhite) Date: Sat, 13 Dec 2014 18:56:52 -0600 Subject: [AMRadio] Crystals In-Reply-To: References: <1418514243.53491.YahooMailBasic@web160604.mail.bf1.yahoo.com> Message-ID: My contact with them was about 6 or 8 months ago so it is fairly recent. As for the crystals they do not manufacture the FT-243 but will supply the HC-6 with pins to fit the 243 applications. They will make anything you want, for a price. In the case of the Collins 100 Kc crystal they gear up and make so many then sell from stock, based on previous sales. The HC-6 will stand quite a bit of current, I forget exactly how much, but more than the small crystals. In cases like this it is best to call to inquire. I am not sure how many of what they make but the owner is related to ham radio and tries to help as much as he can. Jim W5JO -----Original Message----- 1. How recent is the ICM information folks are giving? Did someone order a few days ago, or is this information that's 5 years old? These days source information has a shelf life. 2. What kinds of crystals are we talking about? I mean, if I want a REAL rock, like a FT243 or bigger slab for say, 3880, will they supply that? Or are we only talking about skinny wafers that go on a PC board? tnx 73 Rob K5UJ From k6xyz at sbcglobal.net Sat Dec 13 19:57:58 2014 From: k6xyz at sbcglobal.net (David Harmon) Date: Sat, 13 Dec 2014 18:57:58 -0600 Subject: [AMRadio] Crystals In-Reply-To: References: <1418514243.53491.YahooMailBasic@web160604.mail.bf1.yahoo.com> Message-ID: <007501d01739$02bdc3f0$08394bd0$@sbcglobal.net> + 10 for that Jim. I have met the owner several times and serviced his entire Collins collection. Really nice folks and definitely will accommodate everyone if at all possible. Highly recommended! 73 David Harmon K6XYZ Sperry, OK -----Original Message----- From: AMRadio [mailto:amradio-bounces at mailman.qth.net] On Behalf Of Jim Liles Sent: Saturday, December 13, 2014 6:48 PM To: Rob Atkinson; Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] Crystals Hi Rob, I have purchased some exotic crystals from them as recently as two weeks ago. They bend over backward to provide what you?re looking for. Case and point. I need 36mc hc49 fundamental AT cut crystals. They agreed to make them which is more that most will do for you. Their common crystals cost about $25.00. I?ve tested the Chinese market and they are dirt cheap but minimum orders are 1000 pcs and there is a terrible language barrier --- not sure what you get will be right. Kindest regards Jim K9AXN -----Original Message----- From: Rob Atkinson Sent: Saturday, December 13, 2014 5:53 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] Crystals 1. How recent is the ICM information folks are giving? Did someone order a few days ago, or is this information that's 5 years old? These days source information has a shelf life. 2. What kinds of crystals are we talking about? I mean, if I want a REAL rock, like a FT243 or bigger slab for say, 3880, will they supply that? Or are we only talking about skinny wafers that go on a PC board? tnx 73 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 ______________________________________________________________ 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 From k6xyz at sbcglobal.net Sat Dec 13 19:59:00 2014 From: k6xyz at sbcglobal.net (David Harmon) Date: Sat, 13 Dec 2014 18:59:00 -0600 Subject: [AMRadio] Crystals In-Reply-To: References: <1418514243.53491.YahooMailBasic@web160604.mail.bf1.yahoo.com> Message-ID: <007601d01739$26fe0220$74fa0660$@sbcglobal.net> Both Jims.....hahahah 73 David Harmon K6XYZ Sperry, OK -----Original Message----- From: AMRadio [mailto:amradio-bounces at mailman.qth.net] On Behalf Of Jim Wilhite Sent: Saturday, December 13, 2014 6:57 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] Crystals My contact with them was about 6 or 8 months ago so it is fairly recent. As for the crystals they do not manufacture the FT-243 but will supply the HC-6 with pins to fit the 243 applications. They will make anything you want, for a price. In the case of the Collins 100 Kc crystal they gear up and make so many then sell from stock, based on previous sales. The HC-6 will stand quite a bit of current, I forget exactly how much, but more than the small crystals. In cases like this it is best to call to inquire. I am not sure how many of what they make but the owner is related to ham radio and tries to help as much as he can. Jim W5JO -----Original Message----- 1. How recent is the ICM information folks are giving? Did someone order a few days ago, or is this information that's 5 years old? These days source information has a shelf life. 2. What kinds of crystals are we talking about? I mean, if I want a REAL rock, like a FT243 or bigger slab for say, 3880, will they supply that? Or are we only talking about skinny wafers that go on a PC board? tnx 73 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 From w5jo at brightok.net Sat Dec 13 21:21:44 2014 From: w5jo at brightok.net (Jim Wilhite) Date: Sat, 13 Dec 2014 20:21:44 -0600 Subject: [AMRadio] Crystals In-Reply-To: <007501d01739$02bdc3f0$08394bd0$@sbcglobal.net> References: <1418514243.53491.YahooMailBasic@web160604.mail.bf1.yahoo.com> <007501d01739$02bdc3f0$08394bd0$@sbcglobal.net> Message-ID: <1B545940618746F98A8C053D3393ACC3@JimPC> Back in the 50s and 60s the then owner would accommodate hams who called him on weekends for crystals, even on Sunday afternoons. The strain runs deep. Jim W5JO -----Original Message----- + 10 for that Jim. I have met the owner several times and serviced his entire Collins collection. Really nice folks and definitely will accommodate everyone if at all possible. Highly recommended! 73 David Harmon K6XYZ Sperry, OK -----Original Message----- Hi Rob, I have purchased some exotic crystals from them as recently as two weeks ago. They bend over backward to provide what you?re looking for. Case and point. I need 36mc hc49 fundamental AT cut crystals. They agreed to make them which is more that most will do for you. Their common crystals cost about $25.00. I?ve tested the Chinese market and they are dirt cheap but minimum orders are 1000 pcs and there is a terrible language barrier --- not sure what you get will be right. Kindest regards Jim K9AXN -----Original Message----- From: Rob Atkinson Sent: Saturday, December 13, 2014 5:53 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] Crystals 1. How recent is the ICM information folks are giving? Did someone order a few days ago, or is this information that's 5 years old? These days source information has a shelf life. 2. What kinds of crystals are we talking about? I mean, if I want a REAL rock, like a FT243 or bigger slab for say, 3880, will they supply that? Or are we only talking about skinny wafers that go on a PC board? tnx 73 Rob K5UJ From amradio at mailman.qth.net Sat Dec 13 22:34:31 2014 From: amradio at mailman.qth.net (John King via AMRadio) Date: Sat, 13 Dec 2014 19:34:31 -0800 Subject: [AMRadio] Crystals Message-ID: <1418528071.20089.YahooMailBasic@web160305.mail.bf1.yahoo.com> -------------------------------------------- On Sat, 12/13/14, Jim Wilhite wrote: Subject: Re: [AMRadio] Crystals To: "'Discussion of AM Radio in the Amateur Service'" Date: Saturday, December 13, 2014, 8:21 PM Back in the 50s and 60s the then owner would accommodate hams who called him on weekends for crystals, even on Sunday afternoons.? The strain runs deep. Jim W5JO -----Original Message----- + 10 for that Jim. I have met the owner several times and serviced his entire Collins collection. Really nice folks and definitely will accommodate everyone if at all possible. Highly recommended! 73 David Harmon K6XYZ Sperry, OK -----Original Message----- Hi Rob, I have purchased some exotic crystals from them as recently as two weeks ago.? They bend over backward to provide what you?re looking for.? Case and point.? I need 36mc hc49 fundamental AT cut crystals.? They agreed to make them which is more that most will do for you.? Their common crystals cost about $25.00.? I?ve tested the Chinese market and they are dirt cheap but minimum orders are 1000 pcs and there is a terrible language barrier --- not sure what you get will be right. Kindest regards Jim K9AXN -----Original Message----- I ordered a crystal from ICM within the last 6 months. It was an oscillator crystal for the 15 meter band in my Collins 75A2 receiver. It was, I think, 31mmhz and ICM knew what I needed and provided it. They made it and it took a couple of weeks or maybe a month to get it. They were happy to make it and the price was reasonable as far as I was concerned. I paid for it with it with a credit card and they gladly shipped it to a friend in Pensacola, Florida who was working on my 75A2. If I need a crystal made for a special purpose to Collins quality, I will order from ICM. 73, John, K5PGW From: Rob Atkinson Sent: Saturday, December 13, 2014 5:53 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] Crystals 1.? How recent is the ICM information folks are giving?? Did someone order a few days ago, or is this information that's 5 years old? These days source information has a shelf life. 2.? What kinds of crystals are we talking about?? I mean, if I want a REAL rock, like a FT243 or bigger slab for say, 3880, will they supply that?? Or are we only talking about skinny wafers that go on a PC board? tnx 73 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 From amradio at mailman.qth.net Sat Dec 13 23:39:37 2014 From: amradio at mailman.qth.net (CL in NC via AMRadio) Date: Sat, 13 Dec 2014 20:39:37 -0800 Subject: [AMRadio] ICM crystals Message-ID: <1418531977.35898.YahooMailBasic@web160601.mail.bf1.yahoo.com> I have used ICM since the late 60's when I converted my first Motorola to 6 meters. I just recently ordered a set of crystals for a 1965 Aerocom transceiver. They have crystal specs for just about every piece of ham gear ever made and you can tell them the gear you want the rock for, and they will make it Charlie, W4MEC in NC From ranchorobbo at gmail.com Sun Dec 14 08:15:33 2014 From: ranchorobbo at gmail.com (Rob Atkinson) Date: Sun, 14 Dec 2014 07:15:33 -0600 Subject: [AMRadio] Crystals In-Reply-To: <1418528071.20089.YahooMailBasic@web160305.mail.bf1.yahoo.com> References: <1418528071.20089.YahooMailBasic@web160305.mail.bf1.yahoo.com> Message-ID: Thank you everyone for your replies. I am thinking it might be a good idea to order those unobtainium frequencies while someone is still cutting and grinding unless it is crazy expensive. I could use 3552 kc for example. 73 rob K5UJ From k4kyv at charter.net Sun Dec 14 20:46:13 2014 From: k4kyv at charter.net (Donald Chester) Date: Sun, 14 Dec 2014 19:46:13 -0600 Subject: [AMRadio] ] Lifting center tap to kill B+ Message-ID: <003d01d01808$e8c84b70$ba58e250$@charter.net> Something to consider is how well the transformer manufacturer insulated the midtap connection to the HV winding. A problem with using a transformer designed for standard full wave rectification is that the midtap may have little or no insulation from the core or frame of the transformer, because the tap connection normally is directly grounded or very close to ground potential. I have seen some transformers, mostly old TV power transformers, in which the CT was grounded directly with an internal connection. In the full wave bridge circuit, substantial voltage appears at the midtap and may break through the insulation to ground, probably ruining the transformer. Something else to be careful about is the common practice of placing the filter choke in the negative lead, from CT to ground. This keeps the tap at or near DC ground potential, but under load the full a.c. ripple voltage still appears across the choke and thus at the midtap. This ripple voltage may peak nearly as high as the DC output voltage, causing the same type of failure with a poorly insulated midtap as running the transformer in full wave bridge configuration. Lifting the midtap from ground to cut off the B+, you once again have the same problem. While the switch is open, you have zero current flowing through the circuit and thus zero voltage drop across the transformer winding, and likewise, zero voltage drop across the bleeder resistor, filter cap leakage and any other conductivity there may be to ground at the B+ terminal. This effectively shorts the +HV line to ground, albeit through a high resistance, but it still leaves full HV at the midtap and the possibility of insulation breakdown. I used to break the CT connection to cut off the HV to my class B driver stage during stand-by, since I use a type 83 MV tube type rectifier, and the filament has to stay on all the time, so there is no way to kill the HV transformer without killing the rectifier filament as well. After several years of service, I lost the power transformer. Fortunately, I had an identical replacement. But after installing it, I got to thinking that maybe an internal insulation breakdown, caused by repeatedly lifting the midtap during stand-by, gradually crapped out the insulation. I changed from using a SPST relay from CT to ground to using a DPST relay, with one set of contacts opening the circuit at each end of the HV winding, breaking the connection between the transformer winding and each plate of the rectifier tube. Don k4kyv --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com From w5jo at brightok.net Sun Dec 14 21:12:53 2014 From: w5jo at brightok.net (Jim Wilhite) Date: Sun, 14 Dec 2014 20:12:53 -0600 Subject: [AMRadio] ] Lifting center tap to kill B+ In-Reply-To: <003d01d01808$e8c84b70$ba58e250$@charter.net> References: <003d01d01808$e8c84b70$ba58e250$@charter.net> Message-ID: <0FB61649167E4F0C9BAE7AC67C106B94@JimPC> In the installation you used did you have trouble with arcing across the contacts of the relay when it opened or did you use a vacuum relay? Were there any problems associated with breaking the HV AC? Jim W5JO -----Original Message----- I used to break the CT connection to cut off the HV to my class B driver stage during stand-by, since I use a type 83 MV tube type rectifier, and the filament has to stay on all the time, so there is no way to kill the HV transformer without killing the rectifier filament as well. After several years of service, I lost the power transformer. Fortunately, I had an identical replacement. But after installing it, I got to thinking that maybe an internal insulation breakdown, caused by repeatedly lifting the midtap during stand-by, gradually crapped out the insulation. I changed from using a SPST relay from CT to ground to using a DPST relay, with one set of contacts opening the circuit at each end of the HV winding, breaking the connection between the transformer winding and each plate of the rectifier tube. Don k4kyv From w5jo at brightok.net Mon Dec 15 10:35:15 2014 From: w5jo at brightok.net (Jim Wilhite) Date: Mon, 15 Dec 2014 09:35:15 -0600 Subject: [AMRadio] Crystals Message-ID: A few days ago we were discussing crystal manufacturing. I believe Jan Crystals is still around and who ever needs a crystal might want to contact them for availability and prices if they still do HC 6/U http://www.jancrystals.com/ Jim W5JO From w5jo at brightok.net Mon Dec 15 12:46:40 2014 From: w5jo at brightok.net (Jim Wilhite) Date: Mon, 15 Dec 2014 11:46:40 -0600 Subject: [AMRadio] Crystals In-Reply-To: References: Message-ID: <7487AB6BD2AE4CBEB468E0295B0DD10F@JimPC> Don't know David. I talked to them some time back and they didn't have the 100 Kc crystal I wanted. I do know they are a small family business and did return my call. With these family run businesses it is entirely possible the owner/operator cannot perform as they have in the past. I am posting this to the reflector because of the following link. Bliley is still in business and takes custom orders too. Most of the manufacturers moved to specialty products but retain the capabilities to make what you want. That is if you want to pay the price. http://www.bliley.com/products/ Jim W5JO -----Original Message----- Jim, have you called them?? I did and nothing but an answering machine. At least a year or so, they were not supplying crystals. What is their current status, I haven't a clue. David Knepper - W3CRA/W3ST From k4kyv at charter.net Tue Dec 16 16:09:07 2014 From: k4kyv at charter.net (Donald Chester) Date: Tue, 16 Dec 2014 15:09:07 -0600 Subject: [AMRadio] ICM crystals Message-ID: <000501d01974$87713b30$9653b190$@charter.net> Something I have noticed the past few years is that at hamfests, crystals for amateur frequencies are practically non-existent. Plenty of 3 MHz below 80m, 5 MHz and 8 MHz, but rarely anything for the ham bands. I wonder where they have all gone. Not that many hams run crystal controlled transmitters any more, and I can't see why someone would have bought them all up and hoarding them. Non-amateur frequencies are still plentiful. I used to see plenty of amateur frequencies at flea markets, often sold for as little as a quarter each because no-one thought they were worth anything, since they wouldn't work in a modern rig. There couldn't be THAT many antique radio enthusiasts around who would have a reason to grab them all up. If hams simply tossed them out because they no longer had any use for them, why didn't they toss out the non-amateur frequencies as well? Don k4kyv --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com From k9cox at charter.net Tue Dec 16 16:23:22 2014 From: k9cox at charter.net (Ross Stenberg) Date: Tue, 16 Dec 2014 15:23:22 -0600 Subject: [AMRadio] ICM crystals In-Reply-To: <000501d01974$87713b30$9653b190$@charter.net> References: <000501d01974$87713b30$9653b190$@charter.net> Message-ID: Brian Carling bought all of them :^) -----Original Message----- From: Donald Chester Sent: Tuesday, December 16, 2014 3:09 PM To: amradio at mailman.qth.net Subject: Re: [AMRadio] ICM crystals Something I have noticed the past few years is that at hamfests, crystals for amateur frequencies are practically non-existent. Plenty of 3 MHz below 80m, 5 MHz and 8 MHz, but rarely anything for the ham bands. I wonder where they have all gone. Not that many hams run crystal controlled transmitters any more, and I can't see why someone would have bought them all up and hoarding them. Non-amateur frequencies are still plentiful. I used to see plenty of amateur frequencies at flea markets, often sold for as little as a quarter each because no-one thought they were worth anything, since they wouldn't work in a modern rig. There couldn't be THAT many antique radio enthusiasts around who would have a reason to grab them all up. If hams simply tossed them out because they no longer had any use for them, why didn't they toss out the non-amateur frequencies as well? Don k4kyv From ranchorobbo at gmail.com Tue Dec 16 19:42:43 2014 From: ranchorobbo at gmail.com (Rob Atkinson) Date: Tue, 16 Dec 2014 18:42:43 -0600 Subject: [AMRadio] ICM crystals In-Reply-To: References: <000501d01974$87713b30$9653b190$@charter.net> Message-ID: Here's my theory: They are being horded, then when the hoarder goes SK (and I am not casting stones--if I had a few good frequencies I'd hoard them too) I expect the rocks seem so trivial and insignificant that the spouse and/or children just toss them in the garbage. It's yet another case of, if you can't make head or tail of what the heck the thing is, and you can't imagine a use for it, then out it goes. I bet a million FT243s are in landfills. Rob K5UJ On Tue, Dec 16, 2014 at 3:23 PM, Ross Stenberg wrote: > Brian Carling bought all of them :^) > > -----Original Message----- From: Donald Chester > Sent: Tuesday, December 16, 2014 3:09 PM > To: amradio at mailman.qth.net > Subject: Re: [AMRadio] ICM crystals > > Something I have noticed the past few years is that at hamfests, crystals > for amateur frequencies are practically non-existent. Plenty of 3 MHz below > 80m, 5 MHz and 8 MHz, but rarely anything for the ham bands. > > I wonder where they have all gone. Not that many hams run crystal controlled > transmitters any more, and I can't see why someone would have bought them > all up and hoarding them. Non-amateur frequencies are still plentiful. > > I used to see plenty of amateur frequencies at flea markets, often sold for > as little as a quarter each because no-one thought they were worth anything, > since they wouldn't work in a modern rig. There couldn't be THAT many > antique radio enthusiasts around who would have a reason to grab them all > up. If hams simply tossed them out because they no longer had any use for > them, why didn't they toss out the non-amateur frequencies as well? > > 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 From oldradio at comcast.net Tue Dec 16 21:22:56 2014 From: oldradio at comcast.net (oldradio at comcast.net) Date: Wed, 17 Dec 2014 02:22:56 +0000 (UTC) Subject: [AMRadio] ICM crystals In-Reply-To: References: <000501d01974$87713b30$9653b190$@charter.net> Message-ID: <1949721954.5981836.1418782976164.JavaMail.zimbra@comcast.net> One time when I went to pick up an estate in north Jersey, the mother in law told me, all proud, when I arrived: That she saved me time by throwing out all those old papers and books in the trash the day before. My friend told her I was taking the old radios, so.... out in the trash everything else. Nice radios - with no paper. 73, John ----- Original Message ----- From: "Rob Atkinson" To: "Ross Stenberg" Cc: "Donald Chester" , "Discussion of AM Radio in the Amateur Service" Sent: Tuesday, December 16, 2014 7:42:43 PM Subject: Re: [AMRadio] ICM crystals Here's my theory: They are being horded, then when the hoarder goes SK (and I am not casting stones--if I had a few good frequencies I'd hoard them too) I expect the rocks seem so trivial and insignificant that the spouse and/or children just toss them in the garbage. It's yet another case of, if you can't make head or tail of what the heck the thing is, and you can't imagine a use for it, then out it goes. I bet a million FT243s are in landfills. Rob K5UJ On Tue, Dec 16, 2014 at 3:23 PM, Ross Stenberg wrote: > Brian Carling bought all of them :^) > > -----Original Message----- From: Donald Chester > Sent: Tuesday, December 16, 2014 3:09 PM > To: amradio at mailman.qth.net > Subject: Re: [AMRadio] ICM crystals > > Something I have noticed the past few years is that at hamfests, crystals > for amateur frequencies are practically non-existent. Plenty of 3 MHz below > 80m, 5 MHz and 8 MHz, but rarely anything for the ham bands. > > I wonder where they have all gone. Not that many hams run crystal controlled > transmitters any more, and I can't see why someone would have bought them > all up and hoarding them. Non-amateur frequencies are still plentiful. > > I used to see plenty of amateur frequencies at flea markets, often sold for > as little as a quarter each because no-one thought they were worth anything, > since they wouldn't work in a modern rig. There couldn't be THAT many > antique radio enthusiasts around who would have a reason to grab them all > up. If hams simply tossed them out because they no longer had any use for > them, why didn't they toss out the non-amateur frequencies as well? > > 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 ______________________________________________________________ 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 From tvman1954 at gmail.com Tue Dec 16 22:04:56 2014 From: tvman1954 at gmail.com (Wade Staggs) Date: Tue, 16 Dec 2014 21:04:56 -0600 Subject: [AMRadio] AMRadio Digest, Vol 131, Issue 5 In-Reply-To: References: Message-ID: *FYI, we have recently used International Crystal Supply as a source of crystals for our FT-101E. ( wanted crystal control for 3980 KHZ ) And the same thing for my Drake Twins. ( R-4A and T-4XB ) Also my Friend wanted his very first 11 meter and tube type Cobra CB working again. ( a couple of 4 channel segments had died ) And although he will probably never transmit on it again, he just wanted to keep it at 100%. Also, we have used their crystals recently for the Omni 6 opt 3 .... International Crystal can be found with a Google Search. They are very helpful and knowledgeable with the crystal calculations and formulas. Their database covering old equipment is pretty extensive. We are now getting back to basics at 3885 KHZ. using AM in the Window and are having a Great Time making New Friends.* * 73 to All from Wade/KJ4WS* On Tue, Dec 16, 2014 at 8:23 PM, wrote: > > Send AMRadio mailing list submissions to > amradio at mailman.qth.net > > To subscribe or unsubscribe via the World Wide Web, visit > http://mailman.qth.net/mailman/listinfo/amradio > or, via email, send a message with subject or body 'help' to > amradio-request at mailman.qth.net > > You can reach the person managing the list at > amradio-owner at mailman.qth.net > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of AMRadio digest..." > > > Today's Topics: > > 1. Re: ] Lifting center tap to kill B+ (Jim Wilhite) > 2. Crystals (Jim Wilhite) > 3. Re: Crystals (Jim Wilhite) > 4. Re: ICM crystals (Donald Chester) > 5. Re: ICM crystals (Ross Stenberg) > 6. Re: ICM crystals (Rob Atkinson) > 7. Re: ICM crystals (oldradio at comcast.net) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sun, 14 Dec 2014 20:12:53 -0600 > From: "Jim Wilhite" > To: "Donald Chester" , > Subject: Re: [AMRadio] ] Lifting center tap to kill B+ > Message-ID: <0FB61649167E4F0C9BAE7AC67C106B94 at JimPC> > Content-Type: text/plain; format=flowed; charset="iso-8859-1"; > reply-type=original > > In the installation you used did you have trouble with arcing across the > contacts of the relay when it opened or did you use a vacuum relay? Were > there any problems associated with breaking the HV AC? > > Jim > W5JO > > -----Original Message----- > I used to break the CT connection to cut off the HV to my class B driver > stage during stand-by, since I use a type 83 MV tube type rectifier, and > the filament has to stay on all the time, so there is no way to kill the HV > transformer without killing the rectifier filament as well. After several > years of service, I lost the power transformer. Fortunately, I had an > identical replacement. But after installing it, I got to thinking that > maybe > an internal insulation breakdown, caused by repeatedly lifting the midtap > during stand-by, gradually crapped out the insulation. I changed from using > a SPST relay from CT to ground to using a DPST relay, with one set of > contacts opening the circuit at each end of the HV winding, breaking the > connection between the transformer winding and each plate of the rectifier > tube. > > Don k4kyv > > > > > ------------------------------ > > Message: 2 > Date: Mon, 15 Dec 2014 09:35:15 -0600 > From: "Jim Wilhite" > To: "AM Radio List" > Subject: [AMRadio] Crystals > Message-ID: > Content-Type: text/plain; charset="iso-8859-1" > > A few days ago we were discussing crystal manufacturing. I believe Jan > Crystals is still around and who ever needs a crystal might want to contact > them for availability and prices if they still do HC 6/U > > http://www.jancrystals.com/ > > Jim > W5JO > > ------------------------------ > > Message: 3 > Date: Mon, 15 Dec 2014 11:46:40 -0600 > From: "Jim Wilhite" > To: "David Knepper" > Cc: AM Radio List > Subject: Re: [AMRadio] Crystals > Message-ID: <7487AB6BD2AE4CBEB468E0295B0DD10F at JimPC> > Content-Type: text/plain; format=flowed; charset="iso-8859-1"; > reply-type=response > > Don't know David. I talked to them some time back and they didn't have the > 100 Kc crystal I wanted. I do know they are a small family business and > did > return my call. With these family run businesses it is entirely possible > the owner/operator cannot perform as they have in the past. > > I am posting this to the reflector because of the following link. Bliley > is > still in business and takes custom orders too. Most of the manufacturers > moved to specialty products but retain the capabilities to make what you > want. That is if you want to pay the price. > > http://www.bliley.com/products/ > > Jim > W5JO > > -----Original Message----- > > > Jim, have you called them?? > > I did and nothing but an answering machine. > > At least a year or so, they were not supplying crystals. > > What is their current status, I haven't a clue. > > > > David Knepper - W3CRA/W3ST > > > > ------------------------------ > > Message: 4 > Date: Tue, 16 Dec 2014 15:09:07 -0600 > From: "Donald Chester" > To: > Subject: Re: [AMRadio] ICM crystals > Message-ID: <000501d01974$87713b30$9653b190$@charter.net> > Content-Type: text/plain; charset="us-ascii" > > Something I have noticed the past few years is that at hamfests, crystals > for amateur frequencies are practically non-existent. Plenty of 3 MHz > below > 80m, 5 MHz and 8 MHz, but rarely anything for the ham bands. > > I wonder where they have all gone. Not that many hams run crystal > controlled > transmitters any more, and I can't see why someone would have bought them > all up and hoarding them. Non-amateur frequencies are still plentiful. > > I used to see plenty of amateur frequencies at flea markets, often sold > for > as little as a quarter each because no-one thought they were worth > anything, > since they wouldn't work in a modern rig. There couldn't be THAT many > antique radio enthusiasts around who would have a reason to grab them all > up. If hams simply tossed them out because they no longer had any use for > them, why didn't they toss out the non-amateur frequencies as well? > > Don k4kyv > > > --- > This email has been checked for viruses by Avast antivirus software. > http://www.avast.com > > > > ------------------------------ > > Message: 5 > Date: Tue, 16 Dec 2014 15:23:22 -0600 > From: "Ross Stenberg" > To: "Donald Chester" , > Subject: Re: [AMRadio] ICM crystals > Message-ID: > Content-Type: text/plain; format=flowed; charset="iso-8859-1"; > reply-type=original > > Brian Carling bought all of them :^) > > -----Original Message----- > From: Donald Chester > Sent: Tuesday, December 16, 2014 3:09 PM > To: amradio at mailman.qth.net > Subject: Re: [AMRadio] ICM crystals > > Something I have noticed the past few years is that at hamfests, crystals > for amateur frequencies are practically non-existent. Plenty of 3 MHz > below > 80m, 5 MHz and 8 MHz, but rarely anything for the ham bands. > > I wonder where they have all gone. Not that many hams run crystal > controlled > transmitters any more, and I can't see why someone would have bought them > all up and hoarding them. Non-amateur frequencies are still plentiful. > > I used to see plenty of amateur frequencies at flea markets, often sold > for > as little as a quarter each because no-one thought they were worth > anything, > since they wouldn't work in a modern rig. There couldn't be THAT many > antique radio enthusiasts around who would have a reason to grab them all > up. If hams simply tossed them out because they no longer had any use for > them, why didn't they toss out the non-amateur frequencies as well? > > Don k4kyv > > > > > ------------------------------ > > Message: 6 > Date: Tue, 16 Dec 2014 18:42:43 -0600 > From: Rob Atkinson > To: Ross Stenberg > Cc: Donald Chester , Discussion of AM Radio in the > Amateur Service > Subject: Re: [AMRadio] ICM crystals > Message-ID: > < > CALWD7Z4aYJAGtSB7dYAXOrJMn+wfuNCW5OMKzqJB3jSCWGFEAw at mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > Here's my theory: They are being horded, then when the hoarder goes > SK (and I am not casting stones--if I had a few good frequencies I'd > hoard them too) I expect the rocks seem so trivial and insignificant > that the spouse and/or children just toss them in the garbage. It's > yet another case of, if you can't make head or tail of what the heck > the thing is, and you can't imagine a use for it, then out it goes. I > bet a million FT243s are in landfills. > > Rob > K5UJ > > On Tue, Dec 16, 2014 at 3:23 PM, Ross Stenberg wrote: > > Brian Carling bought all of them :^) > > > > -----Original Message----- From: Donald Chester > > Sent: Tuesday, December 16, 2014 3:09 PM > > To: amradio at mailman.qth.net > > Subject: Re: [AMRadio] ICM crystals > > > > Something I have noticed the past few years is that at hamfests, crystals > > for amateur frequencies are practically non-existent. Plenty of 3 MHz > below > > 80m, 5 MHz and 8 MHz, but rarely anything for the ham bands. > > > > I wonder where they have all gone. Not that many hams run crystal > controlled > > transmitters any more, and I can't see why someone would have bought them > > all up and hoarding them. Non-amateur frequencies are still plentiful. > > > > I used to see plenty of amateur frequencies at flea markets, often sold > for > > as little as a quarter each because no-one thought they were worth > anything, > > since they wouldn't work in a modern rig. There couldn't be THAT many > > antique radio enthusiasts around who would have a reason to grab them > all > > up. If hams simply tossed them out because they no longer had any use for > > them, why didn't they toss out the non-amateur frequencies as well? > > > > 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: 7 > Date: Wed, 17 Dec 2014 02:22:56 +0000 (UTC) > From: oldradio at comcast.net > To: Rob Atkinson > Cc: Donald Chester , AM Radio > > Subject: Re: [AMRadio] ICM crystals > Message-ID: > <1949721954.5981836.1418782976164.JavaMail.zimbra at comcast.net> > Content-Type: text/plain; charset=utf-8 > > One time when I went to pick up an estate in north Jersey, the mother in > law told me, all proud, when I arrived: That she saved me time by throwing > out all those old papers and books in the trash the day before. My friend > told her I was taking the old radios, so.... out in the trash everything > else. > > Nice radios - with no paper. > > 73, John > > ----- Original Message ----- > From: "Rob Atkinson" > To: "Ross Stenberg" > Cc: "Donald Chester" , "Discussion of AM Radio in the > Amateur Service" > Sent: Tuesday, December 16, 2014 7:42:43 PM > Subject: Re: [AMRadio] ICM crystals > > Here's my theory: They are being horded, then when the hoarder goes > SK (and I am not casting stones--if I had a few good frequencies I'd > hoard them too) I expect the rocks seem so trivial and insignificant > that the spouse and/or children just toss them in the garbage. It's > yet another case of, if you can't make head or tail of what the heck > the thing is, and you can't imagine a use for it, then out it goes. I > bet a million FT243s are in landfills. > > Rob > K5UJ > > On Tue, Dec 16, 2014 at 3:23 PM, Ross Stenberg wrote: > > Brian Carling bought all of them :^) > > > > -----Original Message----- From: Donald Chester > > Sent: Tuesday, December 16, 2014 3:09 PM > > To: amradio at mailman.qth.net > > Subject: Re: [AMRadio] ICM crystals > > > > Something I have noticed the past few years is that at hamfests, crystals > > for amateur frequencies are practically non-existent. Plenty of 3 MHz > below > > 80m, 5 MHz and 8 MHz, but rarely anything for the ham bands. > > > > I wonder where they have all gone. Not that many hams run crystal > controlled > > transmitters any more, and I can't see why someone would have bought them > > all up and hoarding them. Non-amateur frequencies are still plentiful. > > > > I used to see plenty of amateur frequencies at flea markets, often sold > for > > as little as a quarter each because no-one thought they were worth > anything, > > since they wouldn't work in a modern rig. There couldn't be THAT many > > antique radio enthusiasts around who would have a reason to grab them > all > > up. If hams simply tossed them out because they no longer had any use for > > them, why didn't they toss out the non-amateur frequencies as well? > > > > 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 > ______________________________________________________________ > 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 > > > ------------------------------ > > Subject: Digest Footer > > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio at mailman.qth.net > > > ------------------------------ > > End of AMRadio Digest, Vol 131, Issue 5 > *************************************** > From ranchorobbo at gmail.com Wed Dec 17 06:19:16 2014 From: ranchorobbo at gmail.com (Rob Atkinson) Date: Wed, 17 Dec 2014 05:19:16 -0600 Subject: [AMRadio] ICM crystals In-Reply-To: <1949721954.5981836.1418782976164.JavaMail.zimbra@comcast.net> References: <000501d01974$87713b30$9653b190$@charter.net> <1949721954.5981836.1418782976164.JavaMail.zimbra@comcast.net> Message-ID: I have found items like rigs from estates that needed coil sets and other accessories and of course none of that is there because everyone had zero knowledge of the gear and what went with it. One example is any Meissner Signal Shifter. You usually get the S.S. but all the coils that go with it are gone. Rob K5UJ On Tue, Dec 16, 2014 at 8:22 PM, wrote: > One time when I went to pick up an estate in north Jersey, the mother in law told me, all proud, when I arrived: That she saved me time by throwing out all those old papers and books in the trash the day before. My friend told her I was taking the old radios, so.... out in the trash everything else. > > Nice radios - with no paper. > > 73, John From ranchorobbo at gmail.com Wed Dec 17 06:21:19 2014 From: ranchorobbo at gmail.com (Rob Atkinson) Date: Wed, 17 Dec 2014 05:21:19 -0600 Subject: [AMRadio] AMRadio Digest, Vol 131, Issue 5 In-Reply-To: References: Message-ID: What did they charge for the 3980 crystal? 73 Rob K5UJ On Tue, Dec 16, 2014 at 9:04 PM, Wade Staggs wrote: > *FYI, we have recently used International Crystal Supply as a source of > crystals for our FT-101E. ( wanted crystal control for 3980 KHZ ) And the > same thing for my Drake Twins. ( R-4A and T-4XB ) From ne1s at securespeed.us Wed Dec 17 07:57:58 2014 From: ne1s at securespeed.us (Larry Szendrei) Date: Wed, 17 Dec 2014 07:57:58 -0500 Subject: [AMRadio] ICM crystals In-Reply-To: <000501d01974$87713b30$9653b190$@charter.net> References: <000501d01974$87713b30$9653b190$@charter.net> Message-ID: <54917DD6.5090602@securespeed.us> On 12/16/14 4:09 PM, Donald Chester wrote: > Something I have noticed the past few years is that at hamfests, crystals > for amateur frequencies are practically non-existent. Plenty of 3 MHz below > 80m, 5 MHz and 8 MHz, but rarely anything for the ham bands. Many of the 8 MHz xtals were used to multiply up to 6 and 2M. I still run into ham band crystals at the fests, although ones outside the bands are more common. At the fall NEARfest I found and purchased one for 1890 KHz, and there was a 2nd one I left there for someone else to buy. The asking price was only $2 each. Another table was selling ham band FT-243s for $5 each. For a while I had been looking for a FT-243 for 7055 KHz (or at least I thought I was) in order to put my Central Electronics 20A on 1945 KHz with stability, and this guy had one. When I went to reach for my wallet, however, I came to the realization I no longer really needed it, as I recently constructed a DDS VFO to use with that rig, which works great. That plus the fact that a scribbling on the xtal indicated the true frequency was a few hundred Hz removed from 7055.000 KHz tipped the scales and I left without buying it. 73, -Larry/NE1S From ranchorobbo at gmail.com Wed Dec 17 09:26:19 2014 From: ranchorobbo at gmail.com (Rob Atkinson) Date: Wed, 17 Dec 2014 08:26:19 -0600 Subject: [AMRadio] ICM crystals In-Reply-To: <54917DD6.5090602@securespeed.us> References: <000501d01974$87713b30$9653b190$@charter.net> <54917DD6.5090602@securespeed.us> Message-ID: I still get the rocks when I can find them because some modern frequency source full of chips may crap out with VLSI chips that are unobtainium, or even if I got a replacement part, putting it in would be impossible with regular bench soldering tools. Another nice thing with crystals is they are handy for testing and troubleshooting. Plug one in and try the rig and see what happens. Depending on what it does you have either eliminated the VFO as the problem or eliminated the transmitter and can focus on the VFO. Crystals have no warmup time. probably other advantages I can't think of. Rob K5UJ From ne1s at securespeed.us Wed Dec 17 09:38:04 2014 From: ne1s at securespeed.us (Larry Szendrei) Date: Wed, 17 Dec 2014 09:38:04 -0500 Subject: [AMRadio] ICM crystals In-Reply-To: References: <000501d01974$87713b30$9653b190$@charter.net> <54917DD6.5090602@securespeed.us> Message-ID: <5491954C.1000205@securespeed.us> All good points, Rob. Tnx and 73, -Larry/NE1S On 12/17/14 9:26 AM, Rob Atkinson wrote: > I still get the rocks when I can find them because some modern > frequency source full of chips may crap out with VLSI chips that are > unobtainium, or even if I got a replacement part, putting it in would > be impossible with regular bench soldering tools. Another nice thing > with crystals is they are handy for testing and troubleshooting. Plug > one in and try the rig and see what happens. Depending on what it > does you have either eliminated the VFO as the problem or eliminated > the transmitter and can focus on the VFO. Crystals have no warmup > time. probably other advantages I can't think of. > > Rob > K5UJ > From wa5ffk at juno.com Sun Dec 28 15:18:45 2014 From: wa5ffk at juno.com (Don Moore) Date: Sun, 28 Dec 2014 20:18:45 GMT Subject: [AMRadio] Help with Baur 707 transitter Message-ID: <20141228.141845.22121.0@webmail01.vgs.untd.com> Hello fellows,I really need someones help. I am currently in central america in the country of Honduras working on a Bauer 707 transmitter for a Christian Radio Station. The 707 was converted and was on 3.250 khz. I am now putting it back on 1600 KHZ The coil which links the 6ac7 drive to the final is a slug tinned ceramic coil with about 1/2 inch diameter. I need to know how many turns should be on this coil.In the manual all it gives me the coil number It is a Miller 43A224CB1. I need to know how many turns. This coil is L5 of the schematic. I didn't bring my frequency counter do have a scope here but very limited on test equipment.Any ideas or help sure would be appreciated. Don MooreW5FFK From wa5ffk at juno.com Sun Dec 28 15:18:45 2014 From: wa5ffk at juno.com (Don Moore) Date: Sun, 28 Dec 2014 20:18:45 GMT Subject: [AMRadio] Help with Baur 707 transitter Message-ID: <20141228.141845.22121.0@webmail01.vgs.untd.com> Hello fellows,I really need someones help. I am currently in central america in the country of Honduras working on a Bauer 707 transmitter for a Christian Radio Station. The 707 was converted and was on 3.250 khz. I am now putting it back on 1600 KHZ The coil which links the 6ac7 drive to the final is a slug tinned ceramic coil with about 1/2 inch diameter. I need to know how many turns should be on this coil.In the manual all it gives me the coil number It is a Miller 43A224CB1. I need to know how many turns. This coil is L5 of the schematic. I didn't bring my frequency counter do have a scope here but very limited on test equipment.Any ideas or help sure would be appreciated. Don MooreW5FFK From Foltarz at rocketmail.com Sun Dec 28 16:17:14 2014 From: Foltarz at rocketmail.com (Mark Foltarz) Date: Sun, 28 Dec 2014 21:17:14 +0000 (UTC) Subject: [AMRadio] Help with Baur 707 transitter In-Reply-To: <20141228.141845.22121.0@webmail01.vgs.untd.com> References: <20141228.141845.22121.0@webmail01.vgs.untd.com> Message-ID: <622600580.2028630.1419801434912.JavaMail.yahoo@jws10640.mail.bf1.yahoo.com> Don, ?This page will help you calculate your turns based on physical properties : Inductance Calculation | ? | | ? | | ? | ? | ? | ? | ? | | Inductance CalculationSingle-layer Coil Inductance and Q | | | | View on www.qsl.net | Preview by Yahoo | | | | ? | ? Is the tank circuit coming off the 6ac7 parallel ?? What is the value of the capacitor ? Is it fixed or variable ?? Formulas for the resonant circuits http://en.wikipedia.org/wiki/LC_circuit#Series_LC_circuit ? Do you have an RF generator ?? If so you can wire that across your tuned circuit and use your oscilloscope as an indicator.? Impedance across a parallel tuned circuit will be high.Add turns till you get your resonance. In lieu of the generator, does the manual indicate what should be the current through the 6ac7 while adjusting the coil ?? You could add turns till you get correct value. At least you have the internet ! good luck de KA4JVY Mark From: Don Moore To: 3890_AM at yahoogroups.com; amradio at mailman.qth.net Cc: amradio at qth.net Sent: Sunday, December 28, 2014 3:18 PM Subject: [AMRadio] Help with Baur 707 transitter Hello fellows,I really need someones help.? I am currently in central america in the country of Honduras working on a Bauer 707 transmitter for a Christian Radio Station.? The 707 was converted and was on 3.250 khz.? I am now putting it back on 1600 KHZ? The? coil which links the 6ac7 drive to the final is a slug tinned ceramic? coil with about 1/2 inch diameter.? I need to know how many turns should be on this coil.In the manual all it gives me? the coil number It is a Miller 43A224CB1.? I need to know how many turns.? This coil is L5 of the schematic. I didn't bring my frequency counter do have a scope here but very limited on test equipment.Any ideas or help sure would be appreciated.? Don MooreW5FFK ______________________________________________________________ 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 From amradio at mailman.qth.net Sun Dec 28 17:48:25 2014 From: amradio at mailman.qth.net (Mel Farrer via AMRadio) Date: Sun, 28 Dec 2014 22:48:25 +0000 (UTC) Subject: [AMRadio] Help with Baur 707 transitter In-Reply-To: <20141228.141845.22121.0@webmail01.vgs.untd.com> References: <20141228.141845.22121.0@webmail01.vgs.untd.com> Message-ID: <801088502.491882.1419806905999.JavaMail.yahoo@jws10743.mail.gq1.yahoo.com> Hello Don, I have a 707 also and converted it up to 75 meters.? L5 is just a RFC choke.? The adjustment is just a peaking coil, the cap on the cold side of the coil is just a bypass.? Since you don't know the condition of the existing coil whether the slug has been changed to brass or ferrite, I would resonate it with a cap.? If you have a scope and can look at the final grid current on 1600, you should be able to put the coil on max and observe the grid current.? Adding a 100 pf or so should allow you to see if the grid current moves higher.? Put the scope on the final grid and make sure the waveform is a clean sine wave for 1600 KHz.? Also, start at the osc current and make sure you are starting off with rated reading.? I found that most of the 707s modified for SW had considerable changes in the RF components to get the drive up.? Take a picture of the RF chain and the final tank configuration.? I hope they left all of the HP components in place and just bypassed them...? Keep in touch. Mel, K6KBE From: Don Moore To: 3890_AM at yahoogroups.com; amradio at mailman.qth.net Cc: amradio at qth.net Sent: Sunday, December 28, 2014 12:18 PM Subject: [AMRadio] Help with Baur 707 transitter Hello fellows,I really need someones help.? I am currently in central america in the country of Honduras working on a Bauer 707 transmitter for a Christian Radio Station.? The 707 was converted and was on 3.250 khz.? I am now putting it back on 1600 KHZ? The? coil which links the 6ac7 drive to the final is a slug tinned ceramic? coil with about 1/2 inch diameter.? I need to know how many turns should be on this coil.In the manual all it gives me? the coil number It is a Miller 43A224CB1.? I need to know how many turns.? This coil is L5 of the schematic. I didn't bring my frequency counter do have a scope here but very limited on test equipment.Any ideas or help sure would be appreciated.? Don MooreW5FFK ______________________________________________________________ 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 From amradio at mailman.qth.net Sun Dec 28 17:48:25 2014 From: amradio at mailman.qth.net (Mel Farrer via AMRadio) Date: Sun, 28 Dec 2014 22:48:25 +0000 (UTC) Subject: [AMRadio] Help with Baur 707 transitter In-Reply-To: <20141228.141845.22121.0@webmail01.vgs.untd.com> References: <20141228.141845.22121.0@webmail01.vgs.untd.com> Message-ID: <801088502.491882.1419806905999.JavaMail.yahoo@jws10743.mail.gq1.yahoo.com> Hello Don, I have a 707 also and converted it up to 75 meters.? L5 is just a RFC choke.? The adjustment is just a peaking coil, the cap on the cold side of the coil is just a bypass.? Since you don't know the condition of the existing coil whether the slug has been changed to brass or ferrite, I would resonate it with a cap.? If you have a scope and can look at the final grid current on 1600, you should be able to put the coil on max and observe the grid current.? Adding a 100 pf or so should allow you to see if the grid current moves higher.? Put the scope on the final grid and make sure the waveform is a clean sine wave for 1600 KHz.? Also, start at the osc current and make sure you are starting off with rated reading.? I found that most of the 707s modified for SW had considerable changes in the RF components to get the drive up.? Take a picture of the RF chain and the final tank configuration.? I hope they left all of the HP components in place and just bypassed them...? Keep in touch. Mel, K6KBE From: Don Moore To: 3890_AM at yahoogroups.com; amradio at mailman.qth.net Cc: amradio at qth.net Sent: Sunday, December 28, 2014 12:18 PM Subject: [AMRadio] Help with Baur 707 transitter Hello fellows,I really need someones help.? I am currently in central america in the country of Honduras working on a Bauer 707 transmitter for a Christian Radio Station.? The 707 was converted and was on 3.250 khz.? I am now putting it back on 1600 KHZ? The? coil which links the 6ac7 drive to the final is a slug tinned ceramic? coil with about 1/2 inch diameter.? I need to know how many turns should be on this coil.In the manual all it gives me? the coil number It is a Miller 43A224CB1.? I need to know how many turns.? This coil is L5 of the schematic. I didn't bring my frequency counter do have a scope here but very limited on test equipment.Any ideas or help sure would be appreciated.? Don MooreW5FFK ______________________________________________________________ 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 From knjhanlon at msn.com Sun Dec 28 19:23:20 2014 From: knjhanlon at msn.com (JAMES HANLON) Date: Sun, 28 Dec 2014 17:23:20 -0700 Subject: [AMRadio] Help with Baur 707 transmitter Message-ID: Don, I found a listing on the J W Miller 43A224CB1 coil. Its form is 1/2 inch diameter and 1.5 inches long. It's nominal inductance is 220 micro henries, max inductance 275 micro henries +/- 5%, min inductance is 138 micro henries +/-10%. Its minimum Q at minimum inductance is 128 measured at 790 kc. Its minimum Q at maximum inductance is 168 at 790 kc. Its max dc resistance is 3.72 ohms. All of that doesn't help answer your question of "how many turns?" If I use a formula for the inductance of a single layer solenoid coil from the Editors and Engineers Radio Handbook, I calculate the following number of turns. For an inductance of 128 microhenries (the minimum, assuming running in the slug will increase the inductance) and for a coil length of 1/2 inch, the number of turns is 122. For a coil length of 1 inch, the number of turns is 158. For a coil length of 1.5 inch, the number of turns is 188. Getting that many turns within the specified length is pretty near impossible. That suggests that the original coil must have been a multi-layer solenoid. Checking the capacitance necessary to resonate with the values of inductance specified at 1600 kc, I get: For L = 138 microhenry, C = 71.7 pf . For L = 220 microhenry, C = 45 pf . For L = 275 microhenry, C = 36 pf . My guess is that this coil is being resonated by whatever tube plus stray capacitance may be in the circuit and that the slug is being adjusted to bring it into resonance. You could always wind whatever size inductor onto that form that you could fit with whatever wire you have available and then resonate with some additional capacitance. Or ... I may be able to help a little. I found two coils in my stash that appear to be wound on the Miller Jumbo Adjustable Coil Forms. They are ceramic forms, 1/2 inch diameter, 1.5 inch length, with 1/4 inch mounting screws and an adjustable slug that I'm guessing is powdered iron. Both forms have multiple layer coils on them. I can do several things with them that might help. I can measure the inductance of each of these coils with my Boonton Q meter. On the off chance that one of them is what you need I could send it to you. If their inductance is too large I could take off some turns until the inductance falls within the range of the coil you are looking for and then send that to you. If sending a coil to you would take too much time, I could just continue to unwind the coil that I measured as having your wanted inductance and tell you how many turns and layers it had. That would give you a starting point at winding a coil yourself, but if you did not have the same size and insulation wire as is on my coils you might turn up with a bit different inductance. So, what if anything would you like me to do? Jim Hanlon, W8KGI From mikesprenger at gmail.com Sun Dec 28 19:31:26 2014 From: mikesprenger at gmail.com (Mike Sprenger) Date: Sun, 28 Dec 2014 19:31:26 -0500 Subject: [AMRadio] Help with Baur 707 transmitter In-Reply-To: References: Message-ID: Amazing !!! Maybe better word is Outstanding. I'm thinking there's a gentleman out in the "field" named Don that's glad to have great support. Mike W4UOO No value added from here, just thought a compliment was in order ! On Sunday, December 28, 2014, JAMES HANLON wrote: > Don, > > I found a listing on the J W Miller 43A224CB1 coil. Its form is 1/2 inch > diameter and 1.5 inches long. It's nominal inductance is 220 micro > henries, max inductance 275 micro henries +/- 5%, min inductance is 138 > micro henries +/-10%. Its minimum Q at minimum inductance is 128 measured > at 790 kc. Its minimum Q at maximum inductance is 168 at 790 kc. Its max > dc resistance is 3.72 ohms. > > All of that doesn't help answer your question of "how many turns?" > > If I use a formula for the inductance of a single layer solenoid coil from > the Editors and Engineers Radio Handbook, I calculate the following number > of turns. > > For an inductance of 128 microhenries (the minimum, assuming running in > the slug will increase the inductance) and for a coil length of 1/2 inch, > the number of turns is 122. For a coil length of 1 inch, the number of > turns is 158. For a coil length of 1.5 inch, the number of turns is 188. > > Getting that many turns within the specified length is pretty near > impossible. That suggests that the original coil must have been a > multi-layer solenoid. > > Checking the capacitance necessary to resonate with the values of > inductance specified at 1600 kc, I get: > > For L = 138 microhenry, C = 71.7 pf . > For L = 220 microhenry, C = 45 pf . > For L = 275 microhenry, C = 36 pf . > > My guess is that this coil is being resonated by whatever tube plus stray > capacitance may be in the circuit and that the slug is being adjusted to > bring it into resonance. > > You could always wind whatever size inductor onto that form that you could > fit with whatever wire you have available and then resonate with some > additional capacitance. Or ... > > I may be able to help a little. I found two coils in my stash that appear > to be wound on the Miller Jumbo Adjustable Coil Forms. They are ceramic > forms, 1/2 inch diameter, 1.5 inch length, with 1/4 inch mounting screws > and an adjustable slug that I'm guessing is powdered iron. Both forms have > multiple layer coils on them. I can do several things with them that might > help. > > I can measure the inductance of each of these coils with my Boonton Q > meter. On the off chance that one of them is what you need I could send it > to you. If their inductance is too large I could take off some turns until > the inductance falls within the range of the coil you are looking for and > then send that to you. If sending a coil to you would take too much time, > I could just continue to unwind the coil that I measured as having your > wanted inductance and tell you how many turns and layers it had. That > would give you a starting point at winding a coil yourself, but if you did > not have the same size and insulation wire as is on my coils you might turn > up with a bit different inductance. > > So, what if anything would you like me to do? > > Jim Hanlon, W8KGI > > ______________________________________________________________ > 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 > -- Thanks, Mike Sprenger (37.9167N 81.1244W is the Summit) From paul at paulbaldock.com Mon Dec 29 18:59:34 2014 From: paul at paulbaldock.com (Paul Baldock) Date: Mon, 29 Dec 2014 15:59:34 -0800 Subject: [AMRadio] Audio Driver Transformer advice In-Reply-To: <1416493184.87027.YahooMailBasic@web160606.mail.bf1.yahoo.c om> References: <1416493184.87027.YahooMailBasic@web160606.mail.bf1.yahoo.com> Message-ID: I'm building a modulator with 2 x 813's in pushpull (strapped as triodes) driven by a 20W Solid State audio amplifier. I need a driver transformer to go between the 813 grids and the 20W amp. The 20W amp can drive about 20V peak to peak. I think I need about 200V peak to peak for the 813's, so a 10:1 turns ratio ratio would be about right. So based on that an audio transformer designed to go from 600Ohms center tapped to 4 or 8 ohms would probably do the job. Have I got the math right? Does something like this exist? Thanks Paul --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com From b.gaz at comcast.net Mon Dec 29 20:20:40 2014 From: b.gaz at comcast.net (b.gaz at comcast.net) Date: Tue, 30 Dec 2014 01:20:40 +0000 (UTC) Subject: [AMRadio] Audio Driver Transformer advice In-Reply-To: <20141230000027.E119E149A50A@mailman.qth.net> References: <1416493184.87027.YahooMailBasic@web160606.mail.bf1.yahoo.com> <20141230000027.E119E149A50A@mailman.qth.net> Message-ID: <1856835283.13689270.1419902440979.JavaMail.zimbra@comcast.net> Any push pull audio output transformer will work. 5000 ohms center tapped to 10,000 ohms will likely work fine. It would be better to get some extra power rating, like 35 watts. Hammond makes them, UTC used to make good ones (LS series), etc. Brett N2dts ----- Original Message ----- From: "Paul Baldock" To: amradio at mailman.qth.net Sent: Monday, December 29, 2014 6:59:34 PM Subject: [AMRadio] Audio Driver Transformer advice I'm building a modulator with 2 x 813's in pushpull (strapped as triodes) driven by a 20W Solid State audio amplifier. I need a driver transformer to go between the 813 grids and the 20W amp. The 20W amp can drive about 20V peak to peak. I think I need about 200V peak to peak for the 813's, so a 10:1 turns ratio ratio would be about right. So based on that an audio transformer designed to go from 600Ohms center tapped to 4 or 8 ohms would probably do the job. Have I got the math right? Does something like this exist? Thanks Paul --- This email has been checked for viruses by Avast antivirus software. http://www.avast.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 From b.gaz at comcast.net Mon Dec 29 22:46:47 2014 From: b.gaz at comcast.net (b.gaz at comcast.net) Date: Tue, 30 Dec 2014 03:46:47 +0000 (UTC) Subject: [AMRadio] Audio Driver Transformer advice In-Reply-To: <963575568.13733362.1419910935068.JavaMail.zimbra@comcast.net> Message-ID: <697999560.13734290.1419911207211.JavaMail.zimbra@comcast.net> I have used various 5000 ohm center tapped to 8 ohm transformers driven by a 20 watt amp to drive 811's, 100TH's, 4x150/4cx250's and KT90's without any problems. That is class B, and AB1. To drive the grids of 813's I am sure an 8 ohm to 5000 ohm center tapped transformer will work great. ----- Original Message ----- From: "Paul Baldock" To: "b gaz" Cc: amradio at mailman.qth.net Sent: Monday, December 29, 2014 9:37:00 PM Subject: Re: [AMRadio] Audio Driver Transformer advice I need a turns ratio of around 10:1, which is an impedance ratio of 100:1. For example 600 Ohms CT to 6 Ohms. I think a transformer designed for 5K would not work in this application. Thanks - Paul --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com From b.gaz at comcast.net Mon Dec 29 22:48:41 2014 From: b.gaz at comcast.net (b.gaz at comcast.net) Date: Tue, 30 Dec 2014 03:48:41 +0000 (UTC) Subject: [AMRadio] Audio Driver Transformer advice In-Reply-To: <1856835283.13689270.1419902440979.JavaMail.zimbra@comcast.net> References: <1416493184.87027.YahooMailBasic@web160606.mail.bf1.yahoo.com> <20141230000027.E119E149A50A@mailman.qth.net> <1856835283.13689270.1419902440979.JavaMail.zimbra@comcast.net> Message-ID: <156104975.13734521.1419911321480.JavaMail.zimbra@comcast.net> I was not clear, any 5000 to 10,000 ohm center tapped to 8 ohms (output transformer). ----- Original Message ----- From: "b gaz" To: "Paul Baldock" Cc: amradio at mailman.qth.net Sent: Monday, December 29, 2014 8:20:40 PM Subject: Re: [AMRadio] Audio Driver Transformer advice Any push pull audio output transformer will work. 5000 ohms center tapped to 10,000 ohms will likely work fine. It would be better to get some extra power rating, like 35 watts. Hammond makes them, UTC used to make good ones (LS series), etc. Brett N2dts ----- Original Message ----- From: "Paul Baldock" To: amradio at mailman.qth.net Sent: Monday, December 29, 2014 6:59:34 PM Subject: [AMRadio] Audio Driver Transformer advice I'm building a modulator with 2 x 813's in pushpull (strapped as triodes) driven by a 20W Solid State audio amplifier. I need a driver transformer to go between the 813 grids and the 20W amp. The 20W amp can drive about 20V peak to peak. I think I need about 200V peak to peak for the 813's, so a 10:1 turns ratio ratio would be about right. So based on that an audio transformer designed to go from 600Ohms center tapped to 4 or 8 ohms would probably do the job. Have I got the math right? Does something like this exist? Thanks Paul --- This email has been checked for viruses by Avast antivirus software. http://www.avast.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 ______________________________________________________________ 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 From mikesprenger at gmail.com Tue Dec 30 11:20:53 2014 From: mikesprenger at gmail.com (Mike Sprenger) Date: Tue, 30 Dec 2014 11:20:53 -0500 Subject: [AMRadio] Replacing dial cord on an S-38e Hallicrafters RX Message-ID: Hi I'm looking for insight in redoing the dial cord on an S-38E, it's very close to breaking, and it won't tune from end to end right now, it's spinning on the tuning knob shaft and is badly frayed as a result. Any insight on how to do this relatively easily ? Thanks, Mike -- Thanks, Mike Sprenger (37.9167N 81.1244W is the Summit)

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