Probably not a lot of discussion because it's stone simple. Hookup power, ground and maybe a wire to the dimmer bus. Connect the antenna and you're done. It's a radio, but there's no audio in/out, so way simpler than a comm. The altitude encoder is nine wires (usually labeled A1, A2, A4, B1, B2, B4, C1, C2, C4) that go from the encoder straight to the corresponding terminals on the transponder. Here's a typical schematic:

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