[R-390] 100kc crystals and 50kc Cal Tones

[Cecil Acuff]

This sounds like something Bob Camp could make recommendation on.  He is for 
sure the OSCILLATOR guru!

Cecil...
----- Original Message ----- 
From: <Flowertime01 at wmconnect.com>
To: <R-390 at mailman.qth.net>
Sent: Thursday, June 14, 2007 10:12 AM
Subject: Re: [R-390] 100kc crystals and 50kc Cal Tones


> Fellows,
> -------------------------------------
> Tim has a good point here.
>
> Some folks use 100kc crystals in their R-390A's, and
> get 50kc calibration marks with a small modification to
> the stuff around the 5814A's on the FR deck.
> -------------------------------------------------
>
> We need to collect this information and develope a schematic and change 
> part
> list. Then get it over to Wei-Li for the Pearls of Wisdom. As it is a
> modification rather than a maintenance history topic for the Y2K Manual.
>
> We can get small 100kc crystals and mount then in the HC-6 cans.
> Any old HC-6 can will work it need not be your 200kc can.
>
> Then the crystal would be a plug into the oven.
>
> Some cap and resistor changes to move the multi vibrator time constant 
> down
> to a 50kc frequency from its 100kc frequency.
>
> Does any one have any parts values?
> Any one on the reflector have a receiver running that way now?
>
> Roger L. Ruszkowski
>
>
>
>
>
>   </HTML>
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