Chirp can be caused by different causes.

1. The crystal may simply change frequency when first loaded. Try a
different crystal, or try the crystal in a different transmitter.

2. Feedback may be incorrect. Too much feedback can cause chirp.
Depending upon the circuit, you can change feedback by varying the
capacitance between grid and cathode.

3. Voltage stabilization. A stable voltage is less likely to chirp.
Sometimes varying the screen voltage will help make the oscillator less
likely to drift.

Draw your circuit out and match it to one in the older Radio Amateur
Handbook. Oscillator circuits are as simple as the Model T.

Colin K7FM


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