Steve,
The problem with the encoder might be as simple as a pushed back pin in a connector. In most basic transponder systems, when you turn the knob to mode C, this sends a ground to the encoder to enable the mode C output of the encoder. Which transponder and encoder do you have? There are 2 different ways in which the encoder will communicate with the transponder. In newer systems, the encoder has a serial output, but in most systems it is analog. If you have an IFR GPS installed, it must be connected to the mode C system too, either a separate encoder or just tied in to the transponder encoder. If you do have this system, is the mode C getting to the GPS? (there is a menu to check this). If it is, then the problem is probably in the wiring. It is still possible that the problem is the transponder. Maybe the mode C switch is bad. It's very common for the connections on the back of the transponder rack to be intermittant especially if the pins were installed by a builder who wasn't using the correct crimpers.
Ron Galbraith
LNCE-N5ES
> Well, actually it's not intermittent. It doesn't work at all. I bought a
> new encoder (same model..King) and plugged up my existing wiring harness and
> still nada. So I guess I need to check the wiring?
>
> Steve
>
> > Since the problem is
> > intermittant, then the best guess problem is the encoder itself.
>
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