Quote:
Originally Posted by FrancoItaly
A variable condenser on the antenna input can be useful in the 20Mhz version where a 20Mhz crystal is used and the antenna circuit is tuned on a harmonic of the oscillator, it can be 80 or 100Mhz. With 8Mhz quartz the harmonics have too small amplitude. However, with the 8 Mhz version, you can try to adjust the capacitor to look for a point where the DC output signal increases, possibly putting a 22pF capacitor in parallel with the variable capacitor.
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A variable capacitor like these?