Glad to hear about your progress. Just a few questions.
- What are the dimensions of the PCB (or case)?
- Do you recommend using the heating resistor especially on the 20 meter version? Was the stability still ok without it? How much did stability improve with the resistor?
- Did you experiment using a higher gain LM386 or other audio amp instead of the single transistor audio amp circuit that you're using? If you did, was there much difference in performance?
Thanks again for all your efforts!