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Help with adding an Icom A200 to my existing RT-328

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schu(at)schu.net
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Posted: Sun Jul 29, 2007 2:06 pm Post subject: Help with adding an Icom A200 to my existing RT-328

List,



I just bought an ICOM A200 while here in Oshkosh so now I'm looking at

the instructions and have a couple of questions on how to wire it up.



I want to add it to the existing RT-328 so that I still have my VOR but

I don't have an audio panel so I want to us a toggle switch.  I talked

to a couple of vendors on how to hook it up but didn't seem to find

anyone that seemed to be completely certain on how to do this so I

wanted to run it past you folks to make sure I got it right.



Here goes:



Wire the headset output of both radios together then manage which one

you want to listen to using the volume on each radio.



Wire the PTT and MIC to a double throw double poll switch so that the

mic jack is only connected to one radio at a time.  Use a common ground.



Wire both radios so that they have their own antennas.



Wire the interlock on both radios so that they disable each other when

one of the two transmits.  I see on the ICOM wiring diagram that pins 9

and N are for PTT and Interlock and on the RT-328 diagram pins L and V

are the ANT interlock and mike key.  So if I'm understanding this

correctly I would connect ping 9 on the Icom to pin L on the RT328 and

pin N on the Icom to pin V on the RT328.



Does this look right to you guys?  If not I would love to know how to do

this or even get pointed in the right direction if this is information I

can find in a good book.



Thanks,

schu

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Bill McMullen

Joined: 23 Nov 2006
Posts: 7

Posted: Sun Jul 29, 2007 6:07 pm Post subject: Re: Help with adding an Icom A200 to my existing RT-328

Why not just use a 3PDT (three pole) switch and put the headphones on there as well. If the ICOM is your primary radio, you'll note that it also has Aux In inputs. By wiring the other radio to one of these (optionally with a switch), you can monitor both radios at once.

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