---------------------------------------------------------- Avionics-List Digest Archive --- Total Messages Posted Sun 09/11/11: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:33 PM - Re: Re: Transponder troubles (William J Hamilton) 2. 05:53 PM - Re:Transponder troubles (Kelly McMullen) 3. 09:03 PM - Re: Re:Transponder troubles (William J Hamilton) ________________________________ Message 1 _____________________________________ Time: 05:33:39 PM PST US From: William J Hamilton Subject: Re: Re: Avionics-List: Transponder troubles Kelly, What kind of transponder? Cheers, Bill Hamilton --------------------------------------------------------------------------------------------------------------- > Pete Christensen wrote: > > > > Not saying this happened to you but my transponder transmitted the wrong > > code once. A tech told me to turn the knobs once in awhile because they > > can develop a dirty contact since I fly around on 1200 all the time. > > > Pete > > > On 9/10/2011 8:52 AM, Kelly McMullen wrote: > > --> Avionics-List message posted by: Kelly > McMullen > > > > Had strange occurrence with Salt Lake Approach yesterday. Initially, > > when they said they couldn't see my transponder, I had a reply light. > > Then they said they could see a 1200 code from it, not the 0363 > > assigned that I had dialed in. A bit later they saw the correct code, > > and it continued to be okay until out of their airspace. Now I > > departed the Phoenix area the day before, communicating with 2 radar > > equipped towers that had no complaints on my transponder and were > > giving me radar traffic callouts, so I know it was working. Not sure > > how a transponder could possibly put out a 1200 code when set to > > something else, and then revert to sending the selected code. I could > > see one or two digits being wrong, but the whole code? I could only > > think they had a weak signal, but checked after I landed and antenna > > was clean. I guess I can check the coax connection, and reseat the > > unit in its tray, but would rather not have to spend for an > > unnecessary bench check. It is an old model with cavity tube, but has > > been rock solid since it was aligned 8 yrs ago, passing every biennial > > check. Any other thoughts? > > > > > > > > > > > ________________________________ Message 2 _____________________________________ Time: 05:53:51 PM PST US Subject: Avionics-List: re:Transponder troubles From: Kelly McMullen A Narco AT-50. On 9/11/2011 6:29 PM, William J Hamilton wrote: > > Kelly, > What kind of transponder? > Cheers, > Bill Hamilton ________________________________ Message 3 _____________________________________ Time: 09:03:25 PM PST US From: William J Hamilton Subject: Re: Avionics-List: re:Transponder troubles Kelly, The reason I asked is that, down here in AU, we have seen some interesting problems with early King transponders, including transmitting codes other than that selected, and incorrect Mode C replies. Some are now subject to to an AD, which effectively means replacement, but I have not heard of any similar problems with Narco. Cheers, Bill Hamilton ----------------------------------------------------------------------------------------------------------------- > Kelly McMullen wrote: > A Narco AT-50. On 9/11/2011 6:29 PM, William J Hamilton wrote: > > Kelly, > What kind of transponder? > Cheers, > Bill Hamilton ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message avionics-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Avionics-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/avionics-list Browse Digests http://www.matronics.com/digest/avionics-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.