Simple QRP projects, 10m, 6m, WSPR beaconing, LF/MF, sub-9kHz, nanowaves and other random stuff
Amazing, Roger. I think I'm going to have to put all my other projects on hold and build one of these.
I need to improve the RX selectivity as AM breakthrough is a problem at times. I will try replacing the choke with a tuned circuit as AA1TJ did and see if this helps. The circuit is so simple but for local QSOs perfectly fine as a full transceiver. AA1TJ always manages DX with his versions - good ears and patience!
Is 'nt that twice 430kms?
RogerIf I use a ceramic resonator instead of a crytal will the circuit produce the same output power with a wider frequency shift?73 Tony G4LLW
Tony, I would expect the oscillator to "chirp" if the VXO range with a ceramic oscillator was reasonably large. For such a simple circuit it is probably better to stick with crystal control. However, try it and see what happens.
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It was cold and bright here today. The photo was taken by my XYL on our way to Cambridge this afternoon.