Terry --
The D4 signal is active from 31,000 to 94,000 ft.
King and Narco are "active low" on the Mode C
pins, so you leave it open. Garmin should be the
same, for digitizer compatability.
Regards,
Fred Fillinger, A063
Terry Seaver wrote:
>
> Help,
>
> while wiring my Garmin GTX320 transponder to an
> ACK altitude encoder I came up missing one signal.
> The GTX320 has inputs A1, A2, ..., C2, C4, and D4,
> while the encoder has only A1, A2, ... C2, C4 outputs,
> but no D4 signal.
> Does anyone know about these signals?
> Shall I just ground or leave open the D4 input
> to the transponder?
>
> Terry Seaver
>
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