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nuckolls.bob(at)aeroelect
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 Posted: Wed Sep 04, 2013 4:35 pm Post subject: Transmitting causes transponder to turn off |
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At 01:16 PM 9/4/2013, you wrote:
| Quote: | Bob, and others.
Wonder if you might comment on the following issue.
Yesterday while transmitting on our Garmin 530 the GTX 330
transponder turned itself off.
This happened three times, before it didn't happen again, strange.
They have separate power supply wires through fuses from the same bus.
Any ideas much appreciated.
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Has this ever happened before? How many hours
on the system?
Bob . . .
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nuckolls.bob(at)aeroelect
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| Posted: Thu Sep 05, 2013 5:51 am Post subject: Transmitting causes transponder to turn off |
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At 03:36 AM 9/5/2013, you wrote:
| Quote: | Bob.
First time it has happened in almost 500 hours of operation.
My initial thought was that, as transmitting takes more power than
just receiving, it might be causing a power transient in the shared bus.
How would I check if this is the case?
Patrick Elliott.
G-LGEZ
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Can you describe the architecture of your electrical
system? Alternator and battery sizes . . . what kind
of airplane? Do you have a voltmeter in the airplane
and are the reading(s) normal?
The added load on a bus by the transmitter is a pittance
compared to the size of your alternator . . . there's
no rational reason for an 'overload' condition. If
it were an overloading situation, then turning on your
landing lights (assuming incandescent lamps) would
impose a transient many times greater on the bus . . .
but a transient that Garmin says is no big deal by
virtue of their DO-160 qualification testing.
Bob . . .
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nuckolls.bob(at)aeroelect
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| Posted: Thu Sep 05, 2013 7:29 am Post subject: Transmitting causes transponder to turn off |
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At 07:41 AM 9/5/2013, you wrote:
| Quote: | Patrick,
This happened to me when I had too many things sharing the same bus. Have you recently added something that could have caused an overloaded condition?
Bill
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Was this with the Garmin transponder?
Bob . . . [quote][b]
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bbradburry(at)bellsouth.n
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| Posted: Thu Sep 05, 2013 10:05 am Post subject: Transmitting causes transponder to turn off |
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Yes, GTX 327.
Bill
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Robert L. Nuckolls, III
Sent: Thursday, September 05, 2013 11:29 AM
To: aeroelectric-list(at)matronics.com
Subject: RE: AeroElectric-List: Transmitting causes transponder to turn off
At 07:41 AM 9/5/2013, you wrote:
Patrick,
This happened to me when I had too many things sharing the same bus. Have you recently added something that could have caused an overloaded condition?
Bill
Was this with the Garmin transponder?
Bob . . . | Quote: | | http://www.matronics.com/Navigator?AeroElectric-List |
0123456789
[quote][b]
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nuckolls.bob(at)aeroelect
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| Posted: Fri Sep 06, 2013 5:16 am Post subject: Transmitting causes transponder to turn off |
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At 03:50 AM 9/6/2013, you wrote:
| Quote: | Bob.
Electrical system architecture of our Long-EZ is based on the old
Z-13 of 11/01 (page Z-11) with a 60 amp B&C alternator and their 32
AH battery, sized for long overwater legs.
I have the Vision MicroSystems VM1000 engine display that includes a
voltmeter, which on recent examination is reading incorrectly.
I am about to do a test flight with a multimeter temporarily in
place to read what the VMS should be reading, and will report back.
Thanks for your help.
Patrick Elliott.
G-LGEZ
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Hmmmm . . . when one appliance 'talks' to
another and induces it to unseemly behaviors,
there is at least a suggestion of an
architecture problem. In plastic airplanes,
the potential for mischievous collaboration
is doubled by the need for both power and
GROUND busses.
So far, the only reported incidents of
xponder shutdown due to keying of the VHF comm
have cited the Garmin products. I'm reluctant
to believe that their due diligence to DO-160
compatibility failed . . . but it has
happened. The fact that only one model
of transponder has been cited for these
occurrences is curious.
Bob . . .
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