Both ends need an isolation transformer and both send and receive
audio. Also if there is a high Z circuit, you may try adding a 1K or so
shunt resistor to lower the impedance of the circuit. I would
experiment with grounding only one end of the cable at first. Of course
this is moot with the cable severed by the mower, but there is no reason
the circuit should not work. Also the .001 line to line and line to
ground may help. We had music on hold from an AM broadcast station into
a telephone patch years ago, and the .001 capacitors fixed that
particular problem. Best luck, Steve NU5D
Jim Brown wrote:
> Skip, I did have transformer coupling on the audio
> lines out at the repeater with both sides of the
> twisted pair isolated from ground, but did not try
> putting transformers in the line back at the computer.
>
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