[MRCA] MRCA Digest, Vol 188, Issue 11

Thu Dec 19 22:16:36 EST 2019

Hi Gang,
              Re the R-392; I have one as part of a full GRC-19 set up. It
required the 
              BFO to be reset. It was zero beating with the knob on + 1.5
Kc.
              For some reason Collins have placed the adjustment screw
UNDERNEATH
              The chassis! The carrier meter zero control is logically
mounted on top.

              The IF/audio module had to be removed and then electrically
reconnected,
              Using the existing leads: extenders are NOT allowed. Some
interesting
              Gymnastics were required to do this. Finally, I was able to
zero adjust
              The BFO and painfully put the whole thing back together (
remembering
              To make sure the bandwidth selector switch read correctly ).

              All done and the BFO zeroed on - 1.5 kc!!! FRUSTRATION! I have
decided to live with it but
              I would love to know why Collins put  it under the chassis.
Does anyone know?

Nick Watling

VK4YT.

-----Original Message-----
From: mrca-bounces at mailman.qth.net [mailto:mrca-bounces at mailman.qth.net] On
Behalf Of mrca-request at mailman.qth.net
Sent: Friday, 20 December 2019 8:21 AM
To: mrca at mailman.qth.net
Subject: MRCA Digest, Vol 188, Issue 11

Send MRCA mailing list submissions to
	mrca at mailman.qth.net

To subscribe or unsubscribe via the World Wide Web, visit
	http://mailman.qth.net/mailman/listinfo/mrca
or, via email, send a message with subject or body 'help' to
	mrca-request at mailman.qth.net

You can reach the person managing the list at
	mrca-owner at mailman.qth.net

When replying, please edit your Subject line so it is more specific than
"Re: Contents of MRCA digest..."

Today's Topics:

   1. Re: A surprise when I opened my R-392 (J Mcvey)
   2. Re: A surprise when I opened my R-392 (David Olean)
   3. Radiogram #61 (B. Smith)

----------------------------------------------------------------------

Message: 1
Date: Thu, 19 Dec 2019 00:10:02 +0000 (UTC)
From: J Mcvey <ac2eu at yahoo.com>
To: R-390 Forum <r-390 at mailman.qth.net>, 	"MRCA (Military Radio List)"
	<mrca at mailman.qth.net>, 	David Olean <k1whs at metrocast.net>
Subject: Re: [MRCA] A surprise when I opened my R-392
Message-ID: <1788702517.693371.1576714202217 at mail.yahoo.com>
Content-Type: text/plain; charset="utf-8"

 Yeah, they call them "modules" . Modules are supposed to make servicing
easier. It's just not the case with the R392.You have disassemble the whole
radio to get them out!No wonder your brain hurt.Mine did too after pulling
the oscillator "module". 

Did what I had to do and put it back together, I decided that pulling the
others "just to check them" would be more work that it was worth.

    On Wednesday, December 18, 2019, 6:38:48 PM EST, David Olean
<k1whs at metrocast.net> wrote:  

 See the photo attached. I had an audio section in my R-392 that needed
work. (The whole thing needed work!)? I was getting leaky capacitor sounds
in the audio, so I took the modules out of the R-392 and was very surprised
to see the "note" written in blue magic marker. Obviously the repair was
done during the Vietnam war.? It brought back a lot of memories from my time
in the draftee Army during the late 60's . (I was not a draftee)

As for the R-392, it is getting better. Someone had messed up the
synchronization of the gear train, Veeder Root counter, the PTO etc.? I went
back to the beginning and? re set the counter, checked all the cams and
tweaked them back. Then I adjusted the Oldham coupler so that the PTO would
read correctly.? When I was done, my brain hurt!

Dave K1WHS

______________________________________________________________
MRCA mailing list
Home: http://mailman.qth.net/mailman/listinfo/mrca
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:MRCA at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://mailman.qth.net/pipermail/mrca/attachments/20191219/20d0bbe9/attachm
ent-0001.html>

------------------------------

Message: 2
Date: Thu, 19 Dec 2019 01:19:16 +0000
From: David Olean <k1whs at metrocast.net>
To: J Mcvey <ac2eu at yahoo.com>, R-390 Forum <r-390 at mailman.qth.net>,
	"MRCA (Military Radio List)" <mrca at mailman.qth.net>
Subject: Re: [MRCA] A surprise when I opened my R-392
Message-ID: <53e337a3-b9f7-4053-ef38-af996c8563c3 at metrocast.net>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

Hello J. McVey

I think you missed the F.T.A. part, but that's OK.? The audio, IF and
Calibrator assy came out quite easily.? I started checking some capacitors
in the audio assy. A coupe of Vitamin Q caps tested 100%. 
Then I got to some GE 0.1 MFD ones. Out of five units, all were leaky. 
My ESR tester said 42 ohms ESR and about 6% loss. I hooked them up to a DC
supply and huge amounts of DC leaked thru. With 100 VDC on one side of the
cap, I saw 45 volts on the opposite side with my Fluke DVM.? I chucked em
all, and now the audio stage is quiet and working just fine.

Dave

On 12/19/2019 12:10 AM, J Mcvey wrote:
> Yeah, they call them "modules" . Modules are supposed to make 
> servicing easier. It's just not the case with the R392.
> You have disassemble the whole radio to get them out!
> No wonder your brain hurt.
> Mine did too after pulling the oscillator "module".
>
> Did what I had to do and put it back together, I decided that pulling 
> the others "just to check them" would be more work that it was worth.
>
>
>
>
> On Wednesday, December 18, 2019, 6:38:48 PM EST, David Olean 
> <k1whs at metrocast.net> wrote:
>
>
> See the photo attached. I had an audio section in my R-392 that needed
> work. (The whole thing needed work!)? I was getting leaky capacitor
> sounds in the audio, so I took the modules out of the R-392 and was very
> surprised to see the "note" written in blue magic marker. Obviously the
> repair was done during the Vietnam war.? It brought back a lot of
> memories from my time in the draftee Army during the late 60's . (I was
> not a draftee)
>
> As for the R-392, it is getting better. Someone had messed up the
> synchronization of the gear train, Veeder Root counter, the PTO etc.? I
> went back to the beginning and? re set the counter, checked all the cams
> and tweaked them back. Then I adjusted the Oldham coupler so that the
> PTO would read correctly.? When I was done, my brain hurt!
>
> Dave K1WHS
>
> ______________________________________________________________
> MRCA mailing list
> Home: http://mailman.qth.net/mailman/listinfo/mrca
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:MRCA at mailman.qth.net <mailto:MRCA at mailman.qth.net>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://mailman.qth.net/pipermail/mrca/attachments/20191219/0dffe92f/attachm
ent-0001.html>

------------------------------

Message: 3
Date: Thu, 19 Dec 2019 17:20:38 -0500
From: "B. Smith" <smithab11 at comcast.net>
To: 'Military Radio Collectors Association' <mrca at mailman.qth.net>
Subject: [MRCA] Radiogram #61
Message-ID: <c592a6fb-74e6-9b6b-f0c8-3ce7541f426c at comcast.net>
Content-Type: text/plain; charset="us-ascii"

An HTML attachment was scrubbed...
URL:
<http://mailman.qth.net/pipermail/mrca/attachments/20191219/e1a23661/attachm
ent.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: kglpmlcacdlonbjo.jpg
Type: image/jpeg
Size: 205525 bytes
Desc: not available
URL:
<http://mailman.qth.net/pipermail/mrca/attachments/20191219/e1a23661/attachm
ent.jpg>

------------------------------

_______________________________________________
MRCA mailing list
MRCA at mailman.qth.net
http://mailman.qth.net/mailman/listinfo/mrca

End of MRCA Digest, Vol 188, Issue 11
*************************************