So, if this has appeared here recently please accept my apologies. It is a simple, low cost, circuit and worth sticking on 10m WSPR when you have an antenna free. Most days you will copy something. As you can see it uses an oscillator running at half frequency and a Polyakov mixer.
I used a cheap GQRP 14.060MHz crystal, pulled. It worked well on 10m WSPR. The same idea would work on FT8 and PSK as long as you can find cheap crystals!
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