[AMRadio] Hanlon's antenna relay comments


John Macaulay via AMRadio amradio at mailman.qth.net
Thu Feb 5 19:47:24 EST 2015


A decade plus ago I built a QSK system based on Jim's design that was published in Electric Radio magazine.  It uses the WE relay mentions.  I run an SB-200 and multiple coax fed verticals and dipoles without problems.  It is a very solid relay and control system.  Recommend it to anyone wanting to build an expandable and solid QSK system.
73


 
Mac MacAulay
WQ8U
Sent from my iPhone

> On Feb 5, 2015, at 4:50 PM, Lloyd Smith DigiTek <llsdigitek at gmail.com> wrote:
> 
> http://www.eham.net/ehamforum/smf/index.php/topic,88897.0.html
> ----- Original Message ----- From: <amradio-request at mailman.qth.net>
> To: <amradio at mailman.qth.net>
> 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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