[R-390] 200kc crystals

[Bob Camp]

Hi

To get a 2 Mc crystal to work in the circuit you would need to change  
the oscillator around a bit. A 10X frequency change isn't generally  
going to work without some parts mods.

The same thing goes for the divider circuit. It's a locked oscillator  
and it "wants" to run at 100 Kc. You might be able to get it to lock  
to 20X it's natural frequency, but that would make it pretty touchy.  
Since it's just an R-C oscillator, moving it up in frequency should  
be possible.

Bob
KB8TQ


On Aug 6, 2007, at 2:31 PM, Barry wrote:

> Anyone know what would happen if the 200kc crystal was replaced  
> with a 2000kc crystal?  Would the oscillator and divider still work  
> at that frequency?  It would yield calibration points at the top  
> and bottom of each band and, if the PTO is tracking correctly,  
> would be a sufficient calibration point for each band, would it  
> not?  Just a thought.
>
> Barry - N4BUQ
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