Re: Modifying Vintage PMR Coils
"L1 tuned by C9 select the 9th harmonic".
52.3x9 = 470.7? A 52.3 MHz crystal will be a 3rd overtone and series resonant.
That suggests LO is high side. I wonder if the need to change L1 was because LO was being put low side instead.
A common trick in conversions. What is your new crystal frequency?
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