Today's Message Index:
----------------------
1. 06:55 AM - Transponder troubles (Kelly McMullen)
2. 07:38 AM - Re: AeroElectric-List: Transponder troubles (Ed Gilroy)
3. 09:12 AM - Re: Transponder troubles (Francis Herr)
4. 09:19 AM - Re: Transponder troubles (George Steube)
5. 10:49 AM - Re: Transponder troubles (Charlie England)
6. 01:55 PM - Re: Transponder troubles (Pete Christensen)
Message 1
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Subject: | Transponder troubles |
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
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Subject: | Re: AeroElectric-List: Transponder troubles |
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@aviating.com> wrote:
> --> AeroElectric-List message posted by: Kelly McMullen <
> kellym@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?
>
>
Message 3
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Subject: | Re: Transponder troubles |
Maybe there was another plane close by you (confusion by approach) or morse likely
the controller simply messed up?
I would wait and see or run it over a few towered airports before I would do anything
drastic.
My 2 cents
Francis
On Sep 10, 2011, at 9:52 AM, Kelly McMullen wrote:
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 4
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Subject: | Transponder troubles |
It's ATC problem. I have had the same issue with ATC on a number of
occasions, if one radar site has a problem and nobody else does I wouldn't
be in a hurry to get to the repair shop.
George
-----Original Message-----
From: owner-avionics-list-server@matronics.com
[mailto:owner-avionics-list-server@matronics.com]On Behalf Of Kelly
McMullen
Sent: Saturday, September 10, 2011 8:52 AM
Subject: Avionics-List: Transponder troubles
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 5
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Subject: | Re: Transponder troubles |
On 09/10/2011 08:52 AM, Kelly McMullen wrote:
> --> Avionics-List message posted by: Kelly McMullen<kellym@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?
Another + for it being an ATC problem. One of my neighbors used to fly
all over the central & southeast USA, & whenever he (and others) would
fly through Memphis airspace ATC would tell them that their transponder
wasn't working properly (no altitude, incorrect altitude, etc etc). The
various transponders seemed to work fine around other class B/C
airspace, & all had problems whenever they entered Memphis airspace.
Charlie
Message 6
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Subject: | Re: Transponder troubles |
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<kellym@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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