Good idea and simple too, the digital activity is in a narrow part of the spectrum on 20M. A VXO should be good enough. 2 xtals should cover sub-band confortably..
I expect that the VFO coil can be replace with a xtal and it should work with minor change of values.
Farhan?
73
Raj
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And how about a VXO?
Chris.
For PSK: I suggest that you take this
requirement to the another extreme and build a DDS VFO !!!