One of my videos describes my transverter for 137kHz, a band on which I had no suitable antennas. Best DX was a WSPR spot by G8HUH at 250km. This is also on my main website at www.g3xbm.co.uk where you can also find a better quality schematic.
In the end this was converted into a RX-TX transverter, although the FT817 was very deaf on 137kHz!
See https://www.youtube.com/watch?v=QHGLkA25MQA
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