137kHz transverter

Because of my poor health, it is some years since I have done any serious experimentation or building, so I hope some of the ideas on my main website inspire others to have a go. In many cases, the designs can be further optimised. If you can make a better circuit I shall be very pleased. Treat my ideas as starting points and don't be afraid to experiment!

See https://sites.google.com/site/g3xbmqrp3/mflf/137khz_tvrtr