My thanks to all for taking the time to reply. It appears, though, that there is no 'silver bullet' with which to solve this problem. As I'm leaving Mexico
for the Marquesas
on Tuesday, I'm afraid my family
and I will just have to hand steer whenever someone is on the radio.
Some of my thoughts on the issue, just the same:
I don't believe it's a problem with the power. The problem occurs with batteries fully charged (over 1,000 amp-hours in brand-new 6V golf carts) which feed a large buss with a 00AWG cable. The positive side of the radio is connected directly to the same positive buss. The ground buss to which the negative lead is connected is fed with another 00AWG cable.
I recently re-installed the transceiver (you may recall
that this unit uses a remote
that's fed with fiber optics) and I took a lot of care terminating the wire ends. As I said originally, the radio works great.
All of the cables for the radio (coax, control cables, etc) run above the headliner
while all of the autopilot cables run below the floor boards. This means that they're all at least 6' from each other.
We have no remote option on the autopilot.
It would be my great pleasure to buy the solver of this problem two, very large, cold beverages. Hell, make it three!
Fair winds and calm seas.