Q: What is the wiring of the SOLO, DUO and TRIO frequency programming dongles. I want to make my own.

Inside our talkback programming dongles there is actually some circuitry. They are not just wired-through connections. The circuitry converts the 1s and 0s on the computer side to audio tones on the SOLO, DUO or TRIO side. These audio tones interface to the micro-controller inside our talkback unit allowing the unit’s radio channel frequencies to be read and changed as required.

There are three different dongles that can be purchased from Wood & Douglas:

SOLO programming dongle:        Part number      01136 1404 A

DUO programming dongle:          Part number      01136 1402 A

TRIO programming dongle:          Part number      01136 1403 A


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