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Dave Richards determined to construct GM3OXX’s little OXO transmitter. The OXO transmitter was first featured within the Autumn 1981 concern of SPRAT, the journal of the G-QRP membership.
I mocked it up on a breadboard and it labored nicely. I observed that the VXO, though not oscillating on key-up, was emitting some very low stage spurii. Looking back, this might nicely have been as a result of stray capacitances within the breadboard, and the truth that the circuit wasn’t constructed over a floor airplane. However, I made a decision to have the keying transistor key each the oscillator and PA.
I used an LPF from QRP-Labs. Band altering may be completed by plugging in a unique crystal and plugging in a unique LPF.
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