1 Attachment(s)
2 Radios into a single channel ICS
This is how I ran 2 radios into 1 ICS port.... PS Engineering PM 1200
We have a 28 Volt system, you will need to change to a 12 Volt relay. The diode may be superfluous for your installation. I used it just to be safe as there is 28 Volts at the top
of the relay when it is in the unenergized condition.
The switch is a momentary (ON) OFF (ON) Up is radio 1 and down is radio 2.
Both audio outputs are coupled in through a capacitor; this way I hear both radios. Comm 1
is a Garmin 430 usually tuned to ATC, Comm2 is an ARC-182 set to 123.45 for communications
with Dash-2, the L-39C.
I used a MILSPEC relay. M83536/16-022M. Use any 4PDT you like. Note: the relay I used
has internal suppression diodes. You will need a supression diode if you use a relay without an internal diode. (For the faint of heart it is $188.46 at Digikey. The mount is extra).
Pete