[ARC5] TCS Xtals

[Henry Mei'l's]

I did a quick check of radio spectrum usage and  3 MHz +/- was generally
assigned to aeronautical mobile applications. However I'd expect that a
"rock" like this may have been used as a calibrator marker (as well) --
I believe 3 MHz also is in the frequency area of many naval , coast guard 
and
government /official communications services, used back then. I picked up
items like these xtals when I was a kid visiting Manhattan's Radio Row in 
the
1950-60's -- we called it "Cortlandt Street" although there were also 
several
places on Canal Street and points in between -- the Cortlandt St. area was
condemned and torn down to make room for the Twin Towers.

Henry, oz3o n2nr


----- Original Message ----- 
From: <WA5CAB at cs.com>
To: <arc5 at mailman.qth.net>
Sent: Tuesday, May 17, 2011 5:34 PM
Subject: Re: [ARC5] TCS Xtals


> If I recall correctly (I have some but not readily accessible), the RMCA
> R-1 is equivalent to the FT-171-B.  I always assumed they were used in
> commercial shipboard transmitters.
>
> In a message dated 5/17/2011 2:19:58 AM Central Daylight Time,
> meils at get2net.dk writes:
>> Robert,
>>
>>  I'm aware that the top has been removed by someone  -- exposed xtal 
>> slabs
>> is not a good idea.
>>  Thanks for the id info.
>> I also have a 3 MHz two pronged unit, slightly wider and less thick than
>> the TCS unit:
>>
>>  RMCA
>>  CRYSTAL UNIT
>>  Radiomarine Corp
>>          of
>>      America
>>
>>  FREQ.Kc      SERIAL
>>   3000            B54921
>> MODEL       TEMP
>>    R-1              35 oC
>>
>>  I cud check my periodicals tosee if 3 MHz was used as a maratime 
>> fequency
>> or whatever.
>>  I have gotten this unit to oscillate.
>>
>>
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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