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!

"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

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
--
add a 2 before @

"Bruce in Alaska" wrote in message
...
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
--
Y'know, that's a real good idea. In fact, I think (woohoo) I remember
some equipment data ports already had optical isolators included in their
design. Newer Northstar stuff? Well, newer than the $9,995.00 Northstar 6000
anyway.

Old Chief Lynn

In article ,
"Lynn Coffelt" wrote:

"Bruce in Alaska" wrote in message
...
In article ,
"Lynn Coffelt" wrote:


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


Bruce in alaska
--
Y'know, that's a real good idea. In fact, I think (woohoo) I remember
some equipment data ports already had optical isolators included in their
design. Newer Northstar stuff? Well, newer than the $9,995.00 Northstar 6000
anyway.

Old Chief Lynn



a lot of the original NEMA stuff used OI's as input devices just so they
wouldn't have to deal with Ground Loops on the data Paths. It is very
easy to drive the LED side of an OI with a few milliamps at 3 volts from
a considerable run of wire. Since it is digital, you just need enough
to cause a transition in the OI's receiver to cause data to flow. It
also makes driving parallel receivers, easy, by just building the driver
side with enough power to drive multiple LED's in parallel.

Bruce in alaska
--
add a 2 before @

Bruce in Alaska wrote in news:bruceg-
:

a lot of the original NEMA stuff used OI's as input devices just so they
wouldn't have to deal with Ground Loops on the data Paths. It is very
easy to drive the LED side of an OI with a few milliamps at 3 volts from
a considerable run of wire. Since it is digital, you just need enough
to cause a transition in the OI's receiver to cause data to flow. It
also makes driving parallel receivers, easy, by just building the driver
side with enough power to drive multiple LED's in parallel.

Bruce in alaska
--


A 12 cent differential MOSFET-input op amp draws ZERO power and you could
parallel a infinite number of NMEA devices with just one load resistor on
the end device.

But, alas, that would eat into profits of the $10,000 units and ****
everyone off.....

"Larry" wrote in message
...
Bruce in Alaska wrote in news:bruceg-
:

a lot of the original NEMA stuff used OI's as input devices just so they
wouldn't have to deal with Ground Loops on the data Paths. It is very
easy to drive the LED side of an OI with a few milliamps at 3 volts from
a considerable run of wire. Since it is digital, you just need enough
to cause a transition in the OI's receiver to cause data to flow. It
also makes driving parallel receivers, easy, by just building the driver
side with enough power to drive multiple LED's in parallel.

Bruce in alaska
--


A 12 cent differential MOSFET-input op amp draws ZERO power and you could
parallel a infinite number of NMEA devices with just one load resistor on
the end device.

But that would not give you galvanic isolation.

Meindert

In article ,
Larry wrote:

Bruce in Alaska wrote in news:bruceg-
:

a lot of the original NEMA stuff used OI's as input devices just so they
wouldn't have to deal with Ground Loops on the data Paths. It is very
easy to drive the LED side of an OI with a few milliamps at 3 volts from
a considerable run of wire. Since it is digital, you just need enough
to cause a transition in the OI's receiver to cause data to flow. It
also makes driving parallel receivers, easy, by just building the driver
side with enough power to drive multiple LED's in parallel.

Bruce in alaska
--


A 12 cent differential MOSFET-input op amp draws ZERO power and you could
parallel a infinite number of NMEA devices with just one load resistor on
the end device.

But, alas, that would eat into profits of the $10,000 units and ****
everyone off.....


you wouldn't get the isolation of the datapath using your method Larry,
and that is what they were more concerened with....


Bruce in alaska
--
add a 2 before @