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VX-420 Patch to DirecTalk

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Oct 10, 2008
I'm waiting to create a cable to patch my VX-420 Radio to an iDen phone. I want to plug into the Vertex programming/accessory plug and patch the cables to a headset connector that'll fit in a headset plug.

I'm hoping there's separate cables within the cable to set it up as follows.

Audio out on VX-420 - Triggers TX on iDen unit and audio feed goes to audio input on cable to iDen phone. (also, that should make it so when the audio feed drops, the TX signal dies too, don't know how to tie that in.)

And vice-versa from iDen unit to VX-420. (Patch audio out on iDen to VX-420 audio in, trigger TX, etc...)

Anyone think this is possible, or am I dreaming?

Thanks in advance.


Jun 20, 2005
Travelers Rest, SC
I had a need for that, but I was unable to find a pin on the I355 that changes state when the radio is receiving. You need that to key up the Vertex.

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