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Transponder troubles

 
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Kellym



Joined: 10 Jan 2006
Posts: 1706
Location: Sun Lakes AZ
PostPosted: Sat Sep 10, 2011 5:55 am    Post subject: Transponder troubles Reply with quote
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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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD
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fherr(at)cfl.rr.com
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PostPosted: Sat Sep 10, 2011 8:12 am    Post subject: Transponder troubles Reply with quote
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?

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at6c(at)bellsouth.net
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PostPosted: Sat Sep 10, 2011 8:19 am    Post subject: Transponder troubles Reply with quote
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

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ceengland(at)bellsouth.ne
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PostPosted: Sat Sep 10, 2011 9:49 am    Post subject: Transponder troubles Reply with quote
On 09/10/2011 08:52 AM, Kelly McMullen wrote:
Quote:


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

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peteohms



Joined: 31 Oct 2007
Posts: 224
Location: Leander, TX
PostPosted: Sat Sep 10, 2011 12:55 pm    Post subject: Transponder troubles Reply with quote
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:
Quote:


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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Pete
Leander, TX
Kitfox III, 912ul, Grove
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wjrhamilton(at)optusnet.c
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PostPosted: Sun Sep 11, 2011 4:33 pm    Post subject: Transponder troubles Reply with quote
Kelly,
What kind of transponder?
Cheers,
Bill Hamilton

---------------------------------------------------------------------------------------------------------------

Quote:
Pete Christensen <pchristensen10(at)austin.rr.com> wrote:


<pchristensen10(at)austin.rr.com>

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:
>
McMullen<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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Kellym



Joined: 10 Jan 2006
Posts: 1706
Location: Sun Lakes AZ
PostPosted: Sun Sep 11, 2011 4:53 pm    Post subject: Transponder troubles Reply with quote
A Narco AT-50.

On 9/11/2011 6:29 PM, William J Hamilton wrote:
Quote:


Kelly,
What kind of transponder?
Cheers,
Bill Hamilton


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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD
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wjrhamilton(at)optusnet.c
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PostPosted: Sun Sep 11, 2011 8:03 pm    Post subject: Transponder troubles Reply with quote
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

-----------------------------------------------------------------------------------------------------------------

Quote:
Kelly McMullen <kellym(at)aviating.com> wrote:



A Narco AT-50.

On 9/11/2011 6:29 PM, William J Hamilton wrote:
Quote:


Kelly,
What kind of transponder?
Cheers,
Bill Hamilton


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