snopercod
Well Known Member
Last month I decided to "upgrade" my GTX-327 transponder by feeding it serial altitude information from my Dynon D-6 rather than from my ancient parallel encoder. It's been working fine and I love the fact that there's no longer a 10 minute warmup period for the pressure altitude. Today, the altitude readout on the GTX-327 started reading precisely 2,000' lower than my actual pressure altitude. I cycled the transponder power to no effect. When I got back on the ground, I de-selected the serial input on the transponder and it defaulted back to the parallel data from the encoder, which was still working. The pressure altitude reads correctly now. I'm thinking that the problem is with the Dynon, but is there any way to confirm this without sending the unit back?