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Downconverter drift

Paul Williamson wrote:

I find that my downconverter, at least, is not stable enough for 
this to work. Its drift is often greater than the Doppler shift!

Wayne replies:

I have been very pleased with the frequency stability of my downconverter after I soldered a 60C PTC thermistor to the L.O. crystal.  Drift is negligible 5 minutes after I turn it on.

Wayne Estes W9AE
Mundelein, IL, USA
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