triple8s Posted May 10, 2014 Report Posted May 10, 2014 I had an issue with my transponder lately it only lasted a minute or two and after I recycled it worked fine. I have a G330ES. The antennas are down stream of the exhaust and I was wondering if lead could interfere with the system?
N201MKTurbo Posted May 10, 2014 Report Posted May 10, 2014 Probably not. If exhaust stains were affecting your antenna, then recycling the transponder would not fix it. You could clean your antenna and see if it gets better. 1
Hank Posted May 10, 2014 Report Posted May 10, 2014 I had periodic issues with my transponder, too, over several months it got worse. Every now and then, then more often, the altitude would change to "0000" and one time as I was cruising along it reported something in the neighborhood of "-10,000 msl" which was a surprise to me! Sometimes briefly, sometimes longer, sometimes ATC would report losing my mode C. Turned out to be a bad encoder on my altimeter. Swapped it out, and no trouble for the last several years. What kind of "issues" are you having with yours?
triple8s Posted May 10, 2014 Author Report Posted May 10, 2014 Transponder is about a year old and once in awhile ATC doesn't pick me up so I turn it off and the turn it back on. I had the encoder replaced when the transponder was put in so it ought a be OK.
Hank Posted May 10, 2014 Report Posted May 10, 2014 Yeah, ATC always had me on radar but would lose my Mode C. It was fun, though, watching the altitude display change by 15,000-20,000' in the blink of an eye. I'm probably the only carbed plane they've ever seen indicating 28,000+ feet on a 30-nm flight! [when it wasn't reading 0000, putting me underground]. 1
Jerry 5TJ Posted May 10, 2014 Report Posted May 10, 2014 I had a similar problem with my GTX327 last year. All would be well, then ATC would tell me my replies had stopped. Later, Mode A and C would be ok again. After much debugging I found the antenna's coaxial cable was intermittent at the BNC connector that mates to the transponder.
Aerodon Posted May 13, 2014 Report Posted May 13, 2014 Don't assume your new encoder is good - I've seen them fail pretty quickly sometimes. Don
Guitarmaster Posted May 18, 2014 Report Posted May 18, 2014 I just had a intermittent KT76 transponder issue. Sometimes it would work and others it would not. Sometimes cycling would work, sometimes not. Turned out to that the transponder was out of alignment. What I learned is the frequency has a "width." If your transponder wanders more than three degrees and ATC is off a few degrees the other way, ATC radar will not pick you up. $170.00 to realign. Works perfectly. Sent from my iPad using Tapatalk
OR75 Posted May 22, 2014 Report Posted May 22, 2014 The alignment thing cannot happen with the 330ES The frequency and width in a KT 76 is set with a cavity. That cavity is usually what fails in old technology transponders. The new solid state technology like the GTX does not have a cavity ( it is all digital) I suspect a loose wire
Guitarmaster Posted May 31, 2014 Report Posted May 31, 2014 Cool. I learn something new everyday!! Even if I don't want to! . Lol! Sent from my XT1080 using Tapatalk
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