[ARC5] identification of Command Set sources and distribution

[Henry Mei'l's]

Robert, (wont call you Mike this time ;0)

Thanks for the detailed information about how to ID my e- for
"'Empfänger" units.

While I was checking my old issues of CQ, I ran across another of
Gordon Whites' Command set articles: October, 1965 pp 34-37
'COMMAND SETS' - very informative and very well written.

Also in the same issue ( pp 43-4), there's an article by  Gordon White,
"Crystal Controlled Command Sets." He writes,
"Transmitters were re-wired to make the calibration  crystal control
 the frequency."

I mention this because, some time ago, we had a discussion on this thread
about the feasibility of using the passive Command set calibration xtal as
an active oscillating xtal.

Henry

----- Original Message ----- 
From: <WA5CAB at cs.com>
To: <arc5 at mailman.qth.net>
Sent: Monday, September 27, 2010 9:37 PM
Subject: Re: [ARC5] identification of Command Set sources and distribution


> Henry,
>
> Early production SCR-274-N receivers and transmitters were all black. 
> That
> would be the -A models.  Late production are unfinished (plain aluminum
> finish).  That would be the -B models.  But early -B models were also 
> black.
> If I had just written "BC-455-B", and hadn't specified color, the 
> assumption
> would be it was aluminum finish.  Which is why I wrote "black BC-455-B".
> They are, relatively speaking, uncommon.
>
> On ID'ing your two "German" receivers, first check is to ID the 2nd IF
> tube.  If 12SF7, then the receivers are AN/ARC-5.  Which one specifically 
> you
> can determine from the frequency coverage of course.  If not ARC-5, second
> check is to count the number of terminals on the audio output 
> transformers.  If
> there are six (6), then the receivers were originally -B model SCR-274-N.
> If there are five (5), measure the resistance of the secondary winding. 
> If
> between 292 and 370 ohms, then -A model SCR-274-N.  If around 21 ohms +/-
> then ARA.
>
> There are other indicators as well.
>
> Robert
>
> In a message dated 9/27/2010 1:54:55 PM Central Daylight Time, me
> ils at get2net.dk writes:
>> My two "German" Command receivers are compatible with my twin-receiver
>> rack that accommodates my two BC-453-B's, made by respectively,
>> Western Electric and Colonial Corp.
>> And as I assume most if not everyone on this thread knows,
>> the rack is also compatible with my R23/ARC-5 and R27/ARC5's.
>> I was hoping that the two types were not compatible, to help me narrow
>> down the in identifying the German units -- but that's no real problem
>> because I can compare them with my BC-453-B's  and my
>> R23 &R27/ARC-5 units.
>>
>> I also have serveral Command set transmitters, most in original form.
>> Several of my Command sets were obtained when I lived in NYC
>> so I doubt their contract no.s are of any particular interest.
>>
>> Mike-WA5CAB, you mention a black BC-455-B (Sure you're not confusing it
>> with
>> an R-25/ARC-5? -- just kidding!)
>> It seems that after all 1964 is a gap in my CQ collection, but I do have 
>> a
>>
>> photocopy of
>> Gordon Elliot's 'The Command Set Story' article.
>>
>> (My CQ articles are in Nov. 60, p. 71, on the TCS transmitter and in the
>> DX
>> section of  March 71,
>> pp 95-6 - about ham radio in Denmark).
>>
>> Hope I haven't made any major booboo's this time around ;0)
>>
>> Henry, Cph.
>>
>>
>
> Robert Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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