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SSB Install on100% Alumninum Boat
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! |
SSB Install on100% Alumninum Boat
"Steve" wrote in message ... 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 |
SSB Install on100% Alumninum Boat
In article ,
"Lynn Coffelt" wrote: "Steve" wrote in message ... 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 @ |
SSB Install on100% Alumninum Boat
"Bruce in Alaska" wrote in message ... In article , "Lynn Coffelt" wrote: "Steve" wrote in message ... 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 |
SSB Install on100% Alumninum Boat
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 @ |
SSB Install on100% Alumninum Boat
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SSB Install on100% Alumninum Boat
"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 |
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