[Elecraft] KX3 signal source

[Frederick Dwight]

If your Siglent does not have enough second harmonic energy, the idea presented to just hang a 1N914
across the output is a good idea except most of the harmonic energy generated will be on the odd
harmonics.  So if you need a stronger signal just tune your Siglent to 1/3 of 50 mHz which is 16.6666 etc
mHz.  The third (and 5th, 7th, etc ) harmonics should be plenty strong.  You may need to crank your
Siglent up a bit to get the desired diode action.  In theory this idea should work.

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