Andy, do you have the PIC and the synthesiser chip data control lines
well buffered/isolated (nice big resistors etc on the data lines ?)
Any sort of current you inject into the synth chip will find its way
onto the output....
On 19/02/2022 7:55 pm, Andy Talbot wrote:
A while back I purchased a low cost TCXO which I then used as the reference
for a synthesizer generating 10GHz. Listening to the output on an SSB
radio, the tone was hopping in a random fashion over four frequencies,
spaced a few tens of Hz apart. This was surreal! I had, at that time,
been building Multifrequency Shift Keyed data sources ( for WSJT modes) by
programming synths directly, but this wasn't the case here. Yet the
hopping tones sounded just like the modulation I woul
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