quote:Originally posted by searun
Wow...you guys are good. I will try that system. Makes sense to create a loop as opposed to a split. Both radios are ICOM...the new unit is the 422 and the old one I think is a 402.
Searun
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!
quote:When a GPS receiver (NMEA0183 ver. 2.0 or 3.01) is connected, the transceiver indicates the current position data in seconds of accuracy.
A NMEA0183 ver. 2.0 or 3.01 (sentence formatters RMC,GGA, GNS, GLL) compatible GPS receiver is required.</u> Ask your dealer about suitable GPS receivers.
Is your GPS at least NMEA 0183 ver 2.0?
Hope this helps the cause?