[Boatanchors] crystal question

[Raymond Cote]

You also listed ch numbers. What do the channels mean?  Some of my FT-243 rocks have channel no. listed. 


On Dec 6, 2012, at 21:58, "Al Klase" <ark at ar88.net> wrote:

> 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/
> 
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