VHF Radios
- Thread starter ratherbefishing
- Start date
Charlie
Well-Known Member
Hey Searun¡
Are you trying to spice the ICOM 422 into the current wiring with the single RCA Plug? If you are, I believe the old radio 402 only has a data out (from the GPS) going to the data in (on the radio), and a ground! Which means you would only be using your red wire and its shield on the new radio? If you do like that that neither will be sending anything back to the GPS and but both should read and show the data. I don't know what kind of GPS, but am assuming the connection(S) on the GPS still has the wiring for NMEA (in and out)?
Personally, I would do this - the ICOM 422 should have "bare" wires. Hook the new radio up and make sure it works by itself, using all the wires and shields - should give you DSC positions on plotter!
Radio NMEA in + (red wire) to GPS NMEA / Data out
Radio NMEA in (red wire shield) to GPS NMEA / Data ground
Radio NMEA out + (white wire) to GPS NMEA / Data in
Radio NMEA out (white wire shield) to GPS NMEA / Data ground
After that attach the Old Radio (402). It has a single RCA plug. I don't know what kind of connection is on the GPS, but you can either splice in a RCA or just cut the existing one and splice it in to your "new" radio red wire. ICOM uses the inner wire as NMEA in (+) and the outer wire as NMEA out (-)
Radio NMEA in + to GPS NMEA / Data out
Radio NMEA in ¨ to GPS NMEA / Data ground
Oh, forgot!
Is your GPS at least NMEA 0183 ver 2.0?
Hope this helps the cause?
GLG
Well-Known Member
Searun your Lowrance GPS has two comm. ports, with data in and data out on both
Com1 yellow wire data out
Com1 orange wire data in
Com2 blue wire data out
Com2 green wire data in
Bare wire is shield / signal ground
Icom m422
Red wire is data in
White wire is data out
No wire for shield / signal ground
Icom m402 this one has the RCA jack (what were they thinking)
Center post is data in
Outside is shield / signal ground
If it were my setup I would hook it up like this.
Com1 GPS yellow to m422 red
Com1 GPS orange to m422 white
Com2 GPS blue to m402 center post
GPS shield to m402 outside
You will need to make a RCA cable to plug into the radio.
RCA come in male and female, you will have to figure out what you need.
You will have to go into the system setup on the GPS to set up your comm. Ports.
Setup com1 for data in and out and com2 for data out only.
Hope this helps.
GLG
Com1 yellow wire data out
Com1 orange wire data in
Com2 blue wire data out
Com2 green wire data in
Bare wire is shield / signal ground
Icom m422
Red wire is data in
White wire is data out
No wire for shield / signal ground
Icom m402 this one has the RCA jack (what were they thinking)
Center post is data in
Outside is shield / signal ground
If it were my setup I would hook it up like this.
Com1 GPS yellow to m422 red
Com1 GPS orange to m422 white
Com2 GPS blue to m402 center post
GPS shield to m402 outside
You will need to make a RCA cable to plug into the radio.
RCA come in male and female, you will have to figure out what you need.
You will have to go into the system setup on the GPS to set up your comm. Ports.
Setup com1 for data in and out and com2 for data out only.
Hope this helps.
GLG
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