> 	In this case, thanks to all.  I'll temporarily connect
> the audio to a short jumper and the isolation transformer and
> then the long line from the secondary of the transformer to the
> audio mixer and see if the smog survives all that.  If it does,
> it's back to the drawing board for something different.
>
> Martin McCormick WB5AGZ

I'd put the transformer at the receive end of the line. Either end breaks
the ground loop, but putting it at the receive end also removes common
mode voltage.

Harold
W6IWI


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