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These electrical bugs sound like grounding
problems. Running all ground connections to a
single point ground would probably clear up 90% of them. I like Bob
Nuckolls' "forest of tabs" ground system (sold by B&C), and since using it
in my last couple airplanes, have had very clean systems in terms of noise and
crosstalk. Once good grounding has been taken care of, routing of wires is
perhaps the next thing to look at. If antenna wires can be separated, and
high-current wires, especially alternator leads, can be kept away from others,
that may help. Finally, some equipment is just not very well designed to
filter out noise. Some years ago I had an E.I. fuel quantity
guage that would go nuts every time I keyed the mic to transmit.
Apparently the fuel probes were acting as antennas, and the E.I. device had
poor (or no) input filtering.
Jim Cameron
Legacy N132X (reserved)
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