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12-03-2019, 13:16
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#16
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Registered User
Join Date: Jan 2010
Location: Portland, Oregon, USA
Boat: 31' Cape George Cutter
Posts: 3,280
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Re: GPS signal to icom M302
Here is the manual for the GlobalSat BR-355S4:
https://www.globalsat.com.tw/ftp/dow...Guide-V1.0.pdf
It does output in MNEA 0183 v3.0 protocol so no problem using it out of the box.
It is an older GPS module; others could have been bought for the same or less price that are newer. Newer would have got you faster first fixes, more sensitive reception (better for below deck operation) and positioning using other GNSS signals (Russian GLONASS, Chinese Bei Dou, European Galileo) but little accuracy improvement. It will get the job done just fine.
Greg
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12-03-2019, 14:12
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#17
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Registered User
Join Date: Jan 2010
Location: Portland, Oregon, USA
Boat: 31' Cape George Cutter
Posts: 3,280
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Re: GPS signal to icom M302
Correction: The BR-355S4 supposedly uses the same module (SiRFstarIV GSD4e) as the older BR-353S4 but the hot start time to first fix has been reduced from 8s to 1s - a competitive number - and there must have been an upgrade to the same model of the module. The available sensitivity is also way up, depending on the LNA used, so again very contemporary performance. The only "improvement" could be the reception of other GNSS signals; in practice GPS is the most accurate so not really an issue unless something happens to GPS. Qualcomm (who bought SiRF) was a little naughty in not using a new model name for the upgraded module, but it is definitely upgraded.
Greg
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12-03-2019, 19:20
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#18
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Registered User
Join Date: Oct 2015
Location: Minnesota / Florida
Boat: Westerly Fulmar 32
Posts: 475
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Re: GPS signal to icom M302
Quote:
Originally Posted by CarinaPDX
Correction: The BR-355S4 supposedly uses the same module (SiRFstarIV GSD4e) as the older BR-353S4 but the hot start time to first fix has been reduced from 8s to 1s - a competitive number - and there must have been an upgrade to the same model of the module. The available sensitivity is also way up, depending on the LNA used, so again very contemporary performance. The only "improvement" could be the reception of other GNSS signals; in practice GPS is the most accurate so not really an issue unless something happens to GPS. Qualcomm (who bought SiRF) was a little naughty in not using a new model name for the upgraded module, but it is definitely upgraded.
Greg
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Wooshhh... right over my head..! I’ll read the manual and digest first, but the m506 does have NMEA 2000 & 0183 inputs. Prepare for more stupid questions...
Regards Steven
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12-03-2019, 19:34
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#19
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Senior Cruiser
Join Date: Mar 2010
Location: gettin naughty on the beach in cornwall
Boat: 63 custom alloy sloop,macwester26,prout snowgoose 37 elite catamaran!
Posts: 10,594
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Re: GPS signal to icom M302
normally if you use the nmea output from a gps chart plotter to the vhf it is just a case of connecting 2 wires
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12-03-2019, 20:04
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#20
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Registered User
Join Date: Oct 2015
Location: Minnesota / Florida
Boat: Westerly Fulmar 32
Posts: 475
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Re: GPS signal to icom M302
After a quick google... the TX and Rex -wires can be grounded to the power supply puck ( not sure why the radio needs to talk to the puck). I’m thinking three wires for the puck:-
+5v
-5v
Puck talker + to radio gps receive
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13-03-2019, 04:58
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#21
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Senior Cruiser
Join Date: Mar 2010
Location: gettin naughty on the beach in cornwall
Boat: 63 custom alloy sloop,macwester26,prout snowgoose 37 elite catamaran!
Posts: 10,594
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Re: GPS signal to icom M302
Quote:
Originally Posted by Steven UK
After a quick google... the TX and Rex -wires can be grounded to the power supply puck ( not sure why the radio needs to talk to the puck). I’m thinking three wires for the puck:-
+5v
-5v
Puck talker + to radio gps receive
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the rx wire and ground would be for software input to the puck via usb cable from a computer.
the radio only needs the tx + and ground - from the puck
to its nmea rx+ input and ground-,only 2 wires ie green- and yellow+ on the radio
puck power input would be the common ground and pos input
radio talker wires brown -and white+ go to either a chartplotter or can be connected to a usb adapter cable to a pc for dsc data on the respective plotters
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13-03-2019, 06:31
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#22
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Registered User
Join Date: Oct 2015
Location: Minnesota / Florida
Boat: Westerly Fulmar 32
Posts: 475
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Re: GPS signal to icom M302
Quote:
Originally Posted by atoll
the rx wire and ground would be for software input to the puck via usb cable from a computer.
the radio only needs the tx + and ground - from the puck
to its nmea rx+ input and ground-,only 2 wires ie green- and yellow+ on the radio
puck power input would be the common ground and pos input
radio talker wires brown -and white+ go to either a chartplotter or can be connected to a usb adapter cable to a pc for dsc data on the respective plotters
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Got it...
I’m assuming that two radios can share the same feed from the puck, I.e. two radios in parallel with the puck TX and ground wire. I may just leave my old radio in place....
Regards Steven
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13-03-2019, 11:48
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#23
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Registered User
Join Date: Jan 2010
Location: Portland, Oregon, USA
Boat: 31' Cape George Cutter
Posts: 3,280
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Re: GPS signal to icom M302
IIRC the NMEA standard is, or at least used to be, that one talker could drive up to 4 listeners but that would not necessarily apply as these GPS pucks aren't NMEA approved. You should be on safe ground with 2, and even if 4 or more were a problem it shouldn't damage anything.
Greg
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13-03-2019, 12:14
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#24
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Senior Cruiser
Join Date: Mar 2010
Location: gettin naughty on the beach in cornwall
Boat: 63 custom alloy sloop,macwester26,prout snowgoose 37 elite catamaran!
Posts: 10,594
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Re: GPS signal to icom M302
Quote:
Originally Posted by Steven UK
Got it...
I’m assuming that two radios can share the same feed from the puck, I.e. two radios in parallel with the puck TX and ground wire. I may just leave my old radio in place....
Regards Steven
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not really any point in that as then you would need 2 vhf antennas or a vhf antenna splitter if you wanted them both to operate,keep it as a spare in a locker or ebay the old one
also for some reason on some radios if the gps data does not show up ,swapping the pos and neg TX inputs rectifies the problem
you might also need to set the nmea settings on the radio in the menu for in/out tx/rx 4800 baud in com1 and or com2
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14-04-2019, 12:48
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#25
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Registered User
Join Date: Oct 2015
Location: Minnesota / Florida
Boat: Westerly Fulmar 32
Posts: 475
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Re: GPS signal to icom M302
Just closing the loop here, I ended up buying a M506 with AIS but still needed the GPS input, the below suggestion worked perfectly. The GPS info is on the screen about a second after the radio boots up and the collision function works great. Many thanks all that helped here.
Regards Steven
Quote:
Originally Posted by CarinaPDX
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