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It came with a long, coiled cord ending in a cigarette lighter plug.
I didn't need the plug, so I lopped off most of the cord, leaving just eight inches or so.
Using an ohmmeter on the ICOM adaptor, I found the connections to the plug were as follows: Unlike earlier ICOM handhelds, the IC-A5 PTT switch operates in a standard aircraft fashion: Ground the PTT to transmit.
The earphone jack is a standard " phono jack, but the microphone jack is slightly smaller and only available through aviation sources.
Be advised, though, that incorrect wiring of this pot can damage the radio. A ground wire goes to one of the outer lugs, and the earphone wire from the radio goes to the OTHER outside lug.
The headset jack itself is then wired from the ground and the MIDDLE lug.
It would be powered by the aircraft electrical system, would provide conventional headset jacks, and use the existing stick-mounted push-to-talk switch.
I selected the ICOM IC-A5 radio due to its very small size.
I did some measurements and came up with a template to use for the hole.
The plug used on the ICOM is a four-conductor 3.5mm unit.
RT Systems part number CT-53R fit the bill, and it came with the wires already molded in place. The same plug is used on camcorders, so your local video shop will have cables that you can cannibalize.
Most handhelds are fairly lengthy, consisting of a display area, keypad, and speaker/battery area, but the A5 packs everything into a ~4" tall main unit.
ICOM apparently no longer produces the A5, but similar techniques can be used to install other handheld radios.