In article ,
Steve Kavanagh wrote:

A year or so ago I was working on a microwave local oscillator (at
about 2.5 GHz) multiplied up from a crystal oscillator near 40 MHz.
The output was found to jump in frequency by tens or hundreds of Hz
many times as the LO chain was warming up. I was able to reduce this
jumping by replacing all the dipped silver mica capacitors in the
crystal oscillator stage with NP0 ceramics.

#snip#

Has anyone else experienced this behaviour ?

Not personally, but I believe I've seen it mentioned in one of Doug
DeMaw W1FB's books on QRP transceiver design.

--
Dave Platt AE6EO
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