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Old 20 May 2013, 14:04   #11
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Hi

Brand new to the forum.
I have a problem in that I cannot get my garmin 152h to talk to my dsc radio. The radio is a M-Tec 500. Can anyone help. Must admit I am not educated on electronics.
Connect the blue wire from the 152 to the brown wire on the M-tec 500.

Make sure the black wire on the 152 is connected to your ground, and that the red wire on the M-tec 500 is also connected to the same ground. Any problems come back

Edit: beaten to it
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Old 21 May 2013, 05:34   #12
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Also there will likely be a spare wire / pin at the back of the Garmin - Don't worry about it!

Most Plotter / GPS units will take data in as well (e.g External antenna) that's what the other wire is for.
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Old 21 May 2013, 05:43   #13
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This must be the friendliest forum out on the ether.
Thanks for the info, one question, when you mention ground, do you mean the negative connection or the black lead from the radio? As I mentioned - NO electronics/electric education.
gd
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Old 21 May 2013, 05:46   #14
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Thanks everyone, one question, when ground is mentioned, does that mean the negative connection to the battery or the black wire from the radio? As mentioned earlier - NO electric/electronic education, educated in the age of gas.
gd
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Old 21 May 2013, 06:05   #15
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Thanks everyone, one question, when ground is mentioned, does that mean the negative connection to the battery or the black wire from the radio? As mentioned earlier - NO electric/electronic education, educated in the age of gas.
gd
The ground is the negative terminal of the battery. Assuming that the Garmin and the M-Tec are already powered up (ie they work), it should simply be a question of connection the blue wire on the 152 to the brown wire on the radio, then connecting the red wire from the radio to the negative terminal of the battery. This is the Garmin way, not the way all manufacturers do it.

Leave the existing power connections to the radio and the GPS alone
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Old 24 May 2013, 05:22   #16
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Thanks everyone, one question, when ground is mentioned, does that mean the negative connection to the battery or the black wire from the radio? As mentioned earlier - NO electric/electronic education, educated in the age of gas.
gd
Yes.

Also known as earth, -ve, 0V and occasionally "sink" depending who you talk to! Almost always the black wire, but there are, as always, some exceptions....

As a general rule electricity needs an "out" and a "back". Thinkl of it a bit like a boiler &a radiator, the water has to go back to the boiler, but without the heat it left with.

The reason there is only one wire in cases like this is that the "way back" on boats is usually through the "batterey -ve" wiring, and the plotter / VHF etc uses the _ve power lead to "share" with the data return wire. (same with cars, where the entire car body is connected to the -ve of the batt), which is why you may see a lioght fitting with only one wire - the return path for the electricity is through the screw into the car body.


Hope that made sense?
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Old 25 June 2013, 08:07   #17
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garmin 152 connect to M-Tec radio

Thanks all for your help. Have been in Ireland, boat left in Gower. Yes everything is now talking and my dsc radio is getting the co-ordinates for emergencies.
Must adnmit, never thought that a red wire would connect into the ground, but it does.
gd
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Old 25 June 2013, 08:29   #18
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....boat left in Gower.
Risky stuff.
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Old 25 June 2013, 12:29   #19
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Thanks all for your help. Have been in Ireland, boat left in Gower. Yes everything is now talking and my dsc radio is getting the co-ordinates for emergencies.
Must adnmit, never thought that a red wire would connect into the ground, but it does.
gd
never forget the sparks code: red to red, black to black , blue to bits
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Old 25 June 2013, 15:06   #20
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Risky stuff.
Boat is pretty safe, at least it has been for the past 20 years. Problem when I came home from Ireland, to find a family of blackbirds under the hood of my tractor. Will not be able to use it to launch for a couple of weeks. Last year I had wagtails, have to charge the RSPB rent.
gd
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