Re: Building the 'Minimod' AM modulator-questions!
Hi Mike,
It sounds like you do have significant FMing. Do you have a radio that can demodulate SSB or CW, if so this will clearly show up any FMing. But again, the Minimod is not renowned for serious FMing, at least as far as the ones I have built/sold or those others have built. Nevertheless, with such a simple circuit it is possible. The design was intended to be simple, quite cheap and easy for anyone to build with good performance. That appears to be most people's experience with it.
Apart from obvious neat, short-leaded layout for any RF circuit construction, I can't think of anything that would cause the amount of drift or FMing you describe, although placing the output tuning components next to the VFO or audio input components is probably a bad idea.
Maybe others could describe the amounts of drift or FMing they have?
Ian
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