[MRCA] MRCA Digest, Vol 127, Issue 18
mike nussman
mikenussman at comcast.net
Sat Nov 22 12:55:45 EST 2014
Relay contact :
Normally open contacts(for years) on relays and switches is not unusual for this.At work I use a 28v rotating beacon bulb ... approx 3-4 amps.
If you load and cycle the contacts into an inductive or restive load.the arcing while opening will clean the oxide and dirt on conatcts.Dont be afraid to double or triple the contact rating on this procedure.
My daytime job is Avionics and use this procedure on SAAB-340 Power distribution Unit auxillary switch contacts.It is not FAA approved procedure but in the real world it often works for stagnent contacts.
BTW I have a 618-s complete system and hope to get on the air this winter.
MIke N
W U 4 V
On Nov 22, 2014, at 12:19 PM, mrca-request at mailman.qth.net wrote:
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> Today's Topics:
>
> 1. Re: Wanted: TCS tx roller inductor (WA5CAB--- via MRCA)
> 2. RS-1/GRC-109 operation with a VFO (Tim)
> 3. Re: [SpyRadios] RS-1/GRC-109 operation with a VFO (Tim)
> 4. Relay question (Jack Antonio)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 20 Nov 2014 15:32:16 -0500
> From: WA5CAB--- via MRCA <mrca at mailman.qth.net>
> To: mrca at mailman.qth.net
> Subject: Re: [MRCA] Wanted: TCS tx roller inductor
> Message-ID: <b444.d420f34.419fa9d0 at cs.com>
> Content-Type: text/plain; charset="us-ascii"
>
> There are two different types and I don't think that they are mechanically
> interchangeable. What TCS model number (range is TCS through TCS-15) does
> he have? Also is it C??-52245 or C??-52245A (sometimes 52245-A)
>
> Robert Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
>
> In a message dated 11/20/2014 13:12:03 PM Central Standard Time,
> mbdittmar at comcast.net writes:
>> Hi -
>>
>> Posting this for a friend ( KD0VBR ) of mine...
>>
>> Looking for the "antenna load" roller inductor for the TCS transmitter.
>> Any leads appreciated !
>>
>> Thanks and 73
>>
>> Mark AB0CW
>>
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> ------------------------------
>
> Message: 2
> Date: Fri, 21 Nov 2014 12:53:37 -0800
> From: Tim <timsamm at gmail.com>
> To: spyradios <spyradios at yahoogroups.com>, MRCA <mrca at mailman.qth.net>
> Subject: [MRCA] RS-1/GRC-109 operation with a VFO
> Message-ID:
> <CAG9SHKMNRRvsa36g5ez6jVeHDU3a4Yib5idOh5cmE_0Eq3VtTg at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi Guys - I know many of us subscribe to multiple mail lists but it was
> suggested that I also forward this link to SpyRadios and MRCA. Apologies
> if you've already seen the earlier version. Seems there are more
> RS-1/GRC-109's out there than crystals... This simple VFO connection
> should also work fine with the RS-6 transmitters. (Flame Shields up...)
>
> FYI, Tim
> N6CC
>
> http://www.n6cc.com/angrc-109-rs-1-transmitter-with-vfo
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> ------------------------------
>
> Message: 3
> Date: Fri, 21 Nov 2014 17:12:20 -0800
> From: Tim <timsamm at gmail.com>
> To: spyradios <SpyRadios at yahoogroups.com>
> Cc: MRCA <mrca at mailman.qth.net>
> Subject: Re: [MRCA] [SpyRadios] RS-1/GRC-109 operation with a VFO
> Message-ID:
> <CAG9SHKP+XsFOs+tAnQGwG2itnGdroAHDFkgoo1euP6_ypVUV3A at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> "
>
>
>
>
>
>
>
> *Somewhere in the garage I have a BC-221-AH frequency meter that I modified
> to be a VFO driver for the RT-3.The BC-221 has that really nice tuning cap
> and dial assembly.The VFO circuit is a 6AC7 oscillator driving a 6AG7.I
> included a crystal calibrator using the original 1 MC xtal, with a 6BE6.
> It's tied to a "gimmick" on the RF output lead, and uses the original audio
> xformer and phones jack to hear the beat note.AC power supply is a 5Y3 and
> 0D3, for 150VDC.I've never used it on-air because I'm not licensed for
> HF.Pete*"
>
> Hi Pete - Yep - that would be a neat setup - and about the right vintage
> too....Smooth tuning - those things are real jewels!
> I had modified a hacked-up T-21/ARC-5 transmitter to use as a VFO driving a
> retuned CB set (Lafayette HE-90) to work on 10 meters AM back in the
> 1960's. That worked well too Worked into Europe regularly from the East
> Coast with plate modulated AM and a 4 element yagi..good fun, learned a
> lot....
> I still have that T-21. Might try it on the RT-3, at least it's the right
> color!
> 73, Tim
> N6CC
>
> On Fri, Nov 21, 2014 at 3:57 PM, Pete McCollum saipan59 at q.com [SpyRadios] <
> SpyRadios at yahoogroups.com> wrote:
>
>>
>>
>> Somewhere in the garage I have a BC-221-AH frequency meter that I modified
>> to be a VFO driver for the RT-3.
>> The BC-221 has that really nice tuning cap and dial assembly.
>> The VFO circuit is a 6AC7 oscillator driving a 6AG7.
>> I included a crystal calibrator using the original 1 MC xtal, with a 6BE6.
>> It's tied to a "gimmick" on the RF output lead, and uses the original audio
>> xformer and phones jack to hear the beat note.
>> AC power supply is a 5Y3 and 0D3, for 150VDC.
>>
>> I've never used it on-air because I'm not licensed for HF.
>>
>> Pete
>>
>>
>> ----- Original Message -----
>> From: Tim timsamm at gmail.com [SpyRadios] <SpyRadios at yahoogroups.com>
>> To: spyradios <spyradios at yahoogroups.com>, MRCA <mrca at mailman.qth.net>
>> Sent: Fri, 21 Nov 2014 15:53:37 -0500 (EST)
>> Subject: [SpyRadios] RS-1/GRC-109 operation with a VFO
>>
>>
>>
>> Hi Guys - I know many of us subscribe to multiple mail lists but it was
>> suggested that I also forward this link to SpyRadios and MRCA. Apologies
>> if you've already seen the earlier version. Seems there are more
>> RS-1/GRC-109's out there than crystals... This simple VFO connection
>> should also work fine with the RS-6 transmitters. (Flame Shields up...)
>>
>> FYI, Tim
>> N6CC
>>
>> http://www.n6cc.com/angrc-109-rs-1-transmitter-with-vfo
>>
>> __._,_.___
>> ------------------------------
>> Posted by: Pete McCollum <saipan59 at q.com>
>> ------------------------------
>> Reply via web post
>> <https://groups.yahoo.com/neo/groups/SpyRadios/conversations/messages/1788;_ylc=X3oDMTJxMXNuZ3YzBF9TAzk3MzU5NzE0BGdycElkAzEwODk2OTgwBGdycHNwSWQDMTcwODM5NjM3OQRtc2dJZAMxNzg4BHNlYwNmdHIEc2xrA3JwbHkEc3RpbWUDMTQxNjYxNDI2Mg--?act=reply&messageNum=1788>
>> ? Reply to sender
>> <saipan59 at q.com?subject=Re%3A%20%5BSpyRadios%5D%20RS-1%2FGRC-109%20operation%20with%20a%20VFO>
>> ? Reply to group
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>> __,_._,___
>>
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> ------------------------------
>
> Message: 4
> Date: Sat, 22 Nov 2014 12:19:01 -0500
> From: Jack Antonio <scr287 at att.net>
> To: boatanchors at mailman.qth.net, milsurplus
> <milsurplus at mailman.qth.net>, mrca at mailman.qth.net
> Subject: [MRCA] Relay question
> Message-ID: <5470C585.1050307 at att.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> I'm wondering if anyone has ever had any success in clearing
> flaky contacts in a hermetically sealed relay.
>
> Thought I'd ask before I start experimenting.
>
> The relay in question is a hermetically sealed can, and
> of course it is soldered in place, in a location where
> removal and replacement would be an involved and painful
> process.
>
> The particular contact of this relay only switches
> about 30 mA resistive, where the other sections
> of this relay are switching motor and relay coils
> and are working fine.
>
> After 60 years of this relay's life, this particular
> contact, when closed, now shows a resistance of 20 ohms
> to open, varying when tapped.
>
> I'm wondering if feeding the contact about a half amp
> while actuating it will clear it up, or make it worse.
>
> To be specific, this relay is in an RT-311/ARC-38, in
> the PA tuning servo system, and this contact opens the
> cathode of the receiver audio amp to mute during the
> channel change cycle. Sometimes it is not allowing
> the receiver to unmute. I do have some "plan B"'s in
> mind, just in case.
>
> Thanks
>
> Jack Antonio WA7DIA/4
>
> PS Tried to use this radio this morning to check into the
> mil net on 3885, but signals from up north were very weak
> here in central Georgia.
>
>
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> End of MRCA Digest, Vol 127, Issue 18
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