[hpsdr] Fixed Saw Oscillators

[Bob McGwier]

Apologies Frank.  I missed that you were talking about multiplying up a 
crystal oscillator rather than taking one of the 1 GHz oscillators and 
taming it with a reference.  I thought we were still talking about a 
Microwave oscillator.  Of course if you multiply an oscillator up the 
best you can hope for is that the phase noise at offset F of the 
oscillator will have the same noise at N*F  where N is the number of 
multiplies up.  Notice I said the best you can hope for.  It never is , 
is it?

Bob


FRANCIS CARCIA wrote:
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> When I worked at Andersen Labs we thought we were doing a good job if 
> a 1 GHz saw oscilltaor only drifted 50 kHz. over the mil temperature 
> range. I wouldn't even consider it for a radio reference.
> The VCSOs have an active phase shifter in the loop to pull the 
> oscillator. I would like to know how a DDS can multiply a clock by 8 
> and not degrade close in phase noise? Frank
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