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Old 21st May 2022, 11:22 pm   #7
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
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Default Re: Unknown transistor osc.

Dave Standring's gang again. I've used a number of their crystal filters. These people were particularly skilled at designing fancy surface profiles to do 'energy trapping' crystals can behave as if they have an number of modes with very fine spacing in place of the more familiar ones. Oscillators can jump around within a group of such modes, leaving a little energy behind in the mode they left sometimes, and sometimes inheriting some in the mode they enter... the phase will have drifted. This results in the oddball fast phase jumps they can give, and which we sometimes see as phase noise. I learned a lot on my visits!

David
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