[AMRadio] AMRadio Digest, Vol 133, Issue 1


Lloyd Smith DigiTek llsdigitek at gmail.com
Thu Feb 5 16:50:32 EST 2015


http://www.eham.net/ehamforum/smf/index.php/topic,88897.0.html
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Sent: Thursday, February 05, 2015 4:42 PM
Subject: AMRadio Digest, Vol 133, Issue 1


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> Today's Topics:
>
>   1. Re: Antenna Relays (JAMES HANLON)
>   2. HF Antenna Tuner and HF related antenna items FS
>      (Ken Simpson, W8EK)
>   3. Amplifier (john nelson)
>   4. Protocol to remove a stuck slug. (Jim Liles)
>   5. AWA AM QSO Party this weekend! (Larry Szendrei)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 23 Jan 2015 12:28:02 -0700
> From: JAMES HANLON <knjhanlon at msn.com>
> To: AMradio <amradio at mailman.qth.net>
> Subject: Re: [AMRadio] Antenna Relays
> Message-ID: <BLU184-W78977EEC66FE6FA45AB659A0360 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Steve, I like to operate QSK (break-in) CW and I use a relay to switch the 
> 50 ohm antenna line coming from my transmatch and going to either my 
> receiver or my transmitter.  I use a Western Electric mercury wetted 
> relay, they type housed in an octal-based tube casing about the size of a 
> metal 6V6.  You can find suitable relays on the Surplus Sales of Nebraska 
> web site at https:// blu184.mail.live.com/?pages=compose .  The 276G relay 
> has one SPDT contact and a 700 ohm coil that they rate for 12 to 24 vdc. 
> It sells for $10.  Actually the contacts are a little more complicated 
> than just the normal SPDT switch.  Each stationary contact, on both the 
> normally closed side and the normally open side, has two electrodes 
> mechanically and electrically separated from one another.  The "swinger" 
> contact has a bar which makes contact with both of the stationary contacts 
> and shorts them together.  They were made this way, I think, to perform a 
> logic function in the old, electromechanical te
> lephone exchanges.  But you can just wire the two normally-open contacts 
> together and the two normally-closed contacts together and treat them like 
> a standard SPDT relay.   The DC rating for the 276 relay contacts is 5 
> amps maximum.  I have a time-sequenced keying circuit so that I don't turn 
> on the transmitter until after the antenna relay has completed its 
> switching cycle - I don't "hot switch" my antenna relay.  Used in this 
> service, my 276 relay holds the output of my Heathkit SB-200 amplifier, 
> about 600 watts, into a nominal 50 ohm load.  That works out to about 3.46 
> amps of RF current.  5 amps would work out to 1250 watts through the 
> relay. The reasons why I use a mercury-wetted relay are as follows.  They 
> are "fast" as relays go, they operate and release in less than 1 
> millisecond.  They have very low contact resistance, under 20 milliohms. 
> They have absolutely no contact "bounce" like normal, dry contact relays 
> have.  Once the contacts close, they stay closed, once
> they open they stay open.  Now that I think about it, the 276 type relay 
> actually has a short period of time during the operating cycle when the NO 
> contacts, the swinger, and the NC contacts are all bridged together.  But 
> this gives me no problem since I don't turn my transmitter on until after 
> the antenna relay switching cycle is completed and I turn the transmitter 
> off before I release the antenna relay.   One caution, the mercury wetted 
> relays must be operated reasonably close to vertical, upright, with the 
> octal base down.  If you turn them "upside down," the liquid mercury 
> inside can flow down onto the contacts and the swinger and short them out. 
> I have no noticeable problem with an "impedance bump" with this antenna 
> relay through 10 meters.  I operate it with both tube-type transmitters 
> and with a Ten Tec Triton IV transceiver.   If you'd be interested in 
> further information on my QSK keyer, I can supply a copy of an article 
> that I wrote about it for Electric Radio M
> agazine, October 1996, page 20.  My keyer switches the antenna relay and 
> generates separate, nested keying closures for the oscillator and 
> amplifier stages of my transmitters.  So the keying sequence when I press 
> and release my key goes:  1-Antenna relay transfer from receiver to 
> transmitter and receiver cutback,  2- Oscillator key closure, 3-Amplifier 
> key closure, 4-Amplifier key opening, 5-Oscillator key opening, 6-Antenna 
> relay transfer from transmitter to receiver and receiver recovery.  This 
> all happens fast enough so that I am able to listen to what's going on 
> between dots and dashes to well over 30 wpm.  I'm not enough of a CW speed 
> demon to ever have pushed it to the point where it doesn't recover between 
> characters.    Hope this is interesting, Jim Hanlon, W8KGI
>
> ------------------------------
>
> Message: 2
> Date: Sat, 24 Jan 2015 10:44:24 -0500
> From: "Ken Simpson, W8EK" <kenw8ek at gmail.com>
> To: amateurradiomarketplace Yahoo
> <amateurradiomarketplace at yahoogroups.com>,
> "amateurswap at yahoogroups.com" <amateurswap at yahoogroups.com>,
> AmatuerRadioSwapFest <amatuerradioswapfest at yahoogroups.com>,
> "amradio at mailman.qth.net" <amradio at mailman.qth.net>, CarolinaHamSwap
> yahoo com <CarolinaHamSwap at yahoogroups.com>
> Subject: [AMRadio] HF Antenna Tuner and HF related antenna items FS
> Message-ID: <54C3BDD8.4020109 at gmail.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
>
> HF Antenna Tuner and HF Antenna related items For Sale:
>
>
> Murch UT-2000, 2 KW HF Antenna Tuner:
>
> The Murch tuner followed the "Ultimate Transmatch" design
> that appeared for many, many years in the ARRL Handbook.
> It was considered to be the absolute top of the line HF tuner.
>
> It is rated at 2000 watts, 80 thru 10 meters. Once one looks
> at the inside, it is easy to see why. The roller inductor is
> HUGE. So is the spacing on the capacitors. This is a very
> rugged tuner.
>
> The front panel says this is a UT-2000. The plain UT-2000
> was primarily sold without a meter. This one has a meter with
> switch for "Off-Fwd-Ref". I think it was available with a meter
> as an option.
>
> The case on Murch tuners originally had a really sick green
> color. Like most, this one has been repainted and is now a black
> hammertone that is in excellent shape.
>
> This one works fine, and looks exceptionally nice.
>
> Paper work for the A and B models is included for $150.
>
>
> CDE Rotor Control Box for 8 wire rotors:
>
> This CDE Rotor control box will control any of the CDE/Telex/HyGain
> 8 wire rotors. This is labeled for use with the Tailtwister, but
> can be used with Ham M, Ham II, Ham II, or Ham IV, and others as
> well.
>
> This one is in the black case, and is a CDE as opposed to the
> Telex or HyGain. Most people consider the CDE higher quality.
> This one has the LEDs showing direction of rotation and brake
> release, in addition to the North centered meter. It has a
> female 8 pin Jones connector on it.
>
> This one works fine and looks really great.
> Paper work is included for $110.
>
>
> Coaxial Antenna Switches:
>
> All work fine, look fine, and use SO-239 connectors.
>
>
> Waters (B & W) Model 376 Protax Coax Switch:
>
> This five position switch permits all five antennas to be shorted
> to ground. It does not short the input connector to ground. This
> is the Waters "Protax" series, which grounds all unused antennas
> (or all antennas if in the "ground" position.
>
> It accepts PL-259 connectors, with the coax going out like the
> spokes of a wheel. There is also a mounting bracket if one would
> want to wall mount it.
>
> This one works fine and looks extremely nice.
> Paperwork is included for $40.
>
>
> Two position "Strip Line" Coax Switch:
> The MFJ 1702 C switch utilizes metal cavity construction for max
> efficiency and high isolation. This two position coax switch has
> a new center ground protection! Better than 60 dB isolation at
> 300 MHz and better than 50 dB at 450MHz. 50 Ohm. The unused
> terminal is automatically grounded for static and RF protection.
> It has less than 0.2 dB insertion loss and SWR below 1.2:1.
> Heavy cavity type construction and SO-239 connectors.
> Mounting holes. It looks very close to new.
> With paper work for $25.
>
> 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. $22
>
>
> Wattmeter / SWR Bridges:
>
> All have SO-239 connectors and work fine.
>
> 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.
>
> Lafayette 99-25835 SWR Bridge
> This HF single meter SWR Bridge also functions as a field
> strength meter. This one is also in its original box, with
> original paper work and appears to be new. $20
>
> Radio Shack 21-524 SWR and Power Meter
> This HF meter measures both average and PEP power in 20/200/2000
> watt ranges as well as functioning as a regular SWR meter.
> Looks close to new. With paperwork for $25.
>
>
> High Sierra HS-1800 DX/B "Screwdriver" HF Mobile Antenna
>
> This HF mobile antenna package includes the HS-1800DX/B antenna,
> the HS-201C/SS Stainless Steel powder coated mounting bracket,
> the HS-110A/PC powder coated stainless steel whip, the MM-SSQD
> powder coated stainless steel quick disconnect, and 60 feet of
> control cable and coax in the same cable, plus radial package.
>
> This is all completely new, unused. A silent key purchased it
> just before his death, and never unpacked it. It is still
> sealed in the plastic bags. It cost him $570.
>
> Buy this package complete with original manual for only $400.
>
>
> Quick Disconnects, Resonator Spring, Roof Rack Mount
>
> Quick Disconnects
> Hustler QD-1, stainless steel, still sealed in package. $18
> Lakeview set of four top portions, and one lower portion, often
> used with Hamsticks. Like new. $24
>
> Hustler RSS-2, Stainless steel resonator spring
> Appears to be unused. No blemishes. $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
>
>
> Hustler "Double Talk" Phasing Harness:
>
> Back in the 1970's, Hustler sold a harness of coaxial cable that
> they called a "Double Talk Harness". It was used to connect to two
> mobile ball mounts, each of which would have an antenna for the
> same band. In theory, they would be phased such that there was
> about 3 db gain, but the reality is that they really shined by
> reducing QSB, in effect acting as a sort of diversity system.
>
> This phasing harness looks fine and works fine. $17
>
>
> Other Hustler HF mobile items:
>
> Hustler RSS-2, Stainless steel resonator spring
> Appears to be unused. No blemishes. $10
>
> Hustler QD-1 Quick Disconnect, new, still sealed in package. $18
>
>
> Coaxial Cable with "N" Connectors:
>
> This cable has a male "N" connector on each end.
> It is about 60 feet long.
>
> The coax is labeled 50-2 V.
>
> This piece is in extremely good condition, with heat
> shrink around the connectors for strain relief. $35
>
>
> Coax connectors and adapters:
>
> Prices are per connector. Several of each are available.
> Most are unused.
>
> SPECIAL: Buy 5 and take 10% off.
> Buy 10 or more and take 20% off.
>
> UG-175 reducing adapters for PL-259 connectors to
> use with RG-58 $.50
>
> UG-176 reducing adapters for PL-259 connectors to
> use with RG-8 X or RG-59.
> Amphenol, still sealed in the package $1
>
> Amphenol crimp type PL-259, sealed in package $3
>
> UHF double female "Barrel connector" $3
>
> UHF "Bulkhead Connector" with mounting hardware
> Double female, about 2 inches long $6
>
> UHF "T" connector with two female (SO-239) and one male
> (PL-259) connection $5
>
> BNC HT to PL-259 adapter.(BNC male to UHF female) $5
>
> BNC male for coax cables
> standard type $2
> crimp on type $3
>
> Chassis mount BNC female
> square mount (uses 4 screws) $3
> Amphenol screw in type, sealed in package $4
>
> BNC "T", two female and one male $3
>
>
> Turnbuckles:
>
> I have two sets of turnbuckles. One is a set of three and are
> larger. The other is a set of five. All of them appear to be
> new, unused.
>
> The set of three has the turnbuckle itself about 6 1/2 inches
> long, with each of the bolts having 3+ inches of thread, plus
> the 1+ inch diameter eye. This set is $30.
>
> The second set consists of five turnbuckles, and is marked "5"
> on it. Does this mean it is considered to be a 5 inch turnbuckle?
> The actual body of it is 3 1/2 inches long, with 2 inches of
> thread on each of the eye bolts, plus the 1 inch diameter eye.
> This set is $25.
>
> Buy both sets for $50.
>
>
> I also have many other accessories available such as many
> different types of microphones, HTs, VHF and UHF rigs, HF
> and VHF/UHF antennas, etc.
> 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
>
>
>
>
>
>
>
>
> ------------------------------
>
> Message: 3
> Date: Thu, 29 Jan 2015 06:57:32 -0600
> From: john nelson <solarelectricjohn at gmail.com>
> To: amradio at mailman.qth.net
> Subject: [AMRadio] Amplifier
> Message-ID:
> <CAFDCxyRmgzfHvAeYKQrhV6CzpJ-Y+bjb3DEAOBivg2+AqSXMRQ at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> Good Morning All, I am looking for an home brew amplifier and power supply
> carrier around 100 watts will be using a viking ranger to excite it. Can
> pickup 125 miles from Minneapolis. Don't care if not working as long as
> iron is good.  Cash or pay pal. 73 John W0XAZ
>
>
> ------------------------------
>
> Message: 4
> Date: Tue, 3 Feb 2015 18:15:58 -0600
> From: "Jim Liles" <hallicrafterssr2000 at k9axn.com>
> To: <amradio at mailman.qth.net>
> Subject: [AMRadio] Protocol to remove a stuck slug.
> Message-ID: <2056E18D3BF149C6A94AA4FF97D71143 at LILESJLAPTOP>
> Content-Type: text/plain; format=flowed; charset="utf-8";
> reply-type=original
>
> Hi Curt,
>
> The coil is loose in the mount because someone tried to drill it out or
> aggressively twisted it.  These old slugs have become fragile over the 
> years
> and often crack when you try to align the radio.  There is no way to get
> that thing out without destroying it.
>
> Here is a simple foolproof way to do it without doing any damage.
>
> Take a coping saw blade that will fit through the existing hole and break
> the end off.  Drill a hole in a dowel rod and epoxy the coping saw blade
> into it with the rake of the teeth facing out so it will cut while pulling
> it outward.  Gently, with patience, cut a slice in the slug then do 
> another
> without going completely through.  Get your favorite vacuum nozzle and
> gently probe the slug to see if it will collapse.  If not, do a little 
> more.
> This method is absolute --- it works every time without fail and I have 
> very
> shaky hands.  It has worked for me hundreds of times.
>
> We have also replaced the coils that have been torn loose from drilling or
> aggressively twisting.  I?m not a brain surgeon and don?t wish to be but 
> in
> the Hal line of radios, you need someone from the Mayo clinic to direct 
> the
> job.
>
> Good luck --- Kindest regards Jim K9AXN
>
>
>
> ------------------------------
>
> Message: 5
> Date: Thu, 05 Feb 2015 16:41:58 -0500
> From: Larry Szendrei <ne1s at securespeed.us>
> To: Discussion of AM Radio <amradio at mailman.qth.net>, Glowbugs
> <tetrode at googlegroups.com>, AWA Reflector
> <antiquewirelessassociation at yahoogroups.com>
> Subject: [AMRadio] AWA AM QSO Party this weekend!
> Message-ID: <54D3E3A6.7090603 at securespeed.us>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> Hi, all.
>
> The Antique Wireless Association is having its AM QSO Party this weekend
> from 2300Z Saturday Feb. 7th to 2300Z Sunday Feb 8th. This is a
> laid-back event; the minimum required exchange is name and QTH (and,
> presumably, callsign!), and you don't need to submit a log, just a brief
> summary. Of course, longer conversations about gear, etc. are encouraged
> and make it more fun. More details at:
>
> http://www.antiquewireless.org/awa-amplitude-modulation-qso-party.html
>
> I'll be operating from my Maine QTH as flagship station W2AN somewhere
> between 1880 - 1900 KHz between 6PM and 9PM EST. Please drop by and say
> hello.
>
> 73,
> -Larry/NE1S
>
>
> ------------------------------
>
> Subject: Digest Footer
>
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> ------------------------------
>
> End of AMRadio Digest, Vol 133, Issue 1
> *************************************** 


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