At that time the synth was set to one frequency and the code went into sleep , so any buffering resistors etc would have served no purpose. The TCXO really was hopping over four frequencies in a PN way at intervals of a little under one second per hop.
Andy www.g4jnt.com On Sat, 19 Feb 2022 at 20:46, glen english LIST <[email protected]> wrote: > 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 > _______________________________________________ > time-nuts mailing list -- [email protected] -- To unsubscribe send > an email to [email protected] > To unsubscribe, go to and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
