DIYbanter - View Single Post - RC transmitter transmits on first harmonic

[email protected]

wrote:

FWIW.. not that it helps:

144 MHz is the American 2m ham band, for which I have a license.. I
left that out. It's not exactly in the band plan for RC aircraft but
it's not like I'd be causing real aircraft to plummet to the earth.

Thanks for the tip about capacitance. There is a trimmer cap on the
board right next to the crystal, I assumed it had something to do with
tuning the feedback but I don't even know what kind of oscillator it
was so I was hesitant to just start twisting knobs.

I doubt that has anything to do with it, all those do is pull the xtal
slightly. Could be wrong tho.

You'll nrace the cct diag for the osc, and tweak or even add some rc
somewhere

NT