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

[Flowertime01 at wmconnect.com]

Fellows,
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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.
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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


 
    

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