In article ,
"Lynn Coffelt" wrote:

"Steve" wrote in message
news
Planning to install an Icom M802 with antenna tuner for a 23' whip
antenna.
My mounting plan is to be on top of the main cabin with three point guy
wires, far away from the Radar and VHF.
All my electronics are grounded to a central point and the chasses are
floating and centrally grounded too.

Planning to share the windlass 70amp power supply for SSB primary power
which is on a separate battery but will be interfacing with the NMEA buss
and GPS equipment that shares the House Bank!

What advice do you recommend for grounding and antenna ground plane!

Will there be interference between electronics on different Batteries? If
so
what can I do!

Although it is not completely clear, without a good schematic of your
DC power system(s), when the data is exchanged between two devices, run from
separate source batterys, a potential for problems exists. This is not
necessarily a noise problem, but of a possible ground or battery negative
situation. Many (not all) data exchange systems have one side or leg of the
data at ground/negative/chassis level. This by itself is normally no big
deal UNTIL a couple of things happen:
One is if the ground or negative side fuse (often used in Icom and
other equipment) blows, then the equipment with the open negative power
source will seek power through the data cable's ground(ed) lead. Much smoke.
The second is if a piece of equipment develops a loose or intermittent
negative power source connection.... can't happen? Maybe, but a great
potential for sending more smoke signals.
Old Chief Lynn
been there, done that, sent smoke signals



I would look at some Optical Isolators to fix this problem. They are
cheap, easy to use, and provide 1000V Isolation....


Bruce in alaska
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add a 2 before @