[Boatanchors] crystal question

[Al Klase]

For the technoweenie historian:

These were the jeep radios developed by the Signal Corps Laboratory in 
conjunction with Galvin Corp. (Motorola).  They use the so-called 
crystal-saver architecture.  The crystal frequency is multiplied by 4 to 
provide the local oscillator for a receiver with a 4.3 MHz IF. In 
transmit, the DC output of the receiver's FM discriminator is used to 
frequency lock the TX oscillator to the crystal controlled RX frequency.

E.g., (8000 x 4) + 4300 = 36,300 KHz.

Al

On 12/6/2012 10:30 PM, WA5CAB at cs.com wrote:
> Assuming that the crystals are FT-243 types:
>
> SCR-609/610 (BC-659)
> SCR-619 (BC-1335)
> AN/TRC-20 (RT-111/TRC-20)
>
> Operating frequencies would be 36.3 through 37.4 MC.
>
> In a message dated 12/06/2012 20:20:53 PM Central Standard Time,
> cosmophone at yahoo.com writes:
>> Among a lot of parts I bought recently there were five crystals which, I
>> guess, are for a military piece of radio gear.  The frequencies in KHz/Kc
>> are:
>>
>> 8000   channel 363
>> 8025   channel 364
>>
>> 8100   channel 367
>>
>> 8175   channel 370
>>
>> 8275   channel 374
>>
>> Can anyone enlighten me as to what equipment uses these and if they have
>> any value in today's world.
>>
> Robert Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/