>I had in mind a simple feedback loop, but perhaps that is not possible
>in practice.
I used to have a copy of Pappenfuss' 'SSB principles and circuits' (I
think it was called). He described circuits using phase detectors and
feedback loops controlling servos. This book was written in the 50ties,
so computer control was not an option yet. Unfortunately my copy was
never seen again after I lent it to somebody. You might be able to find
a copy in your university's library.
Gerard, PA3DQW / AA3ES / MoAIU
>
>
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