egilroy(at)gmail.com
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 Posted: Sat Sep 10, 2011 6:38 am Post subject: AeroElectric-List: Transponder troubles |
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I had something similar happen to me only a few weeks ago arriving at Lancaster, PA. I was on a discrete code from prior flight following services and the tower said I was squawking 1200. A quick right turn followed by a look down revealed a VERY close VFR aircraft underneath me on my exact original course which was the runway heading for a straight in to the active. Was he blanketing my signal in some manner? unknown. Once I had diverged a bit the tower began seeing my signal and correct discrete code.
I wonder how long we had been flying in "un-intentional formation"?
On Sat, Sep 10, 2011 at 9:52 AM, Kelly McMullen <kellym(at)aviating.com (kellym(at)aviating.com)> wrote:
[quote]--> AeroElectric-List message posted by: Kelly McMullen <kellym(at)aviating.com (kellym(at)aviating.com)>
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?
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