Today's Message Index:
----------------------
1. 01:40 AM - Transmitting causes transponder to turn off (Linda Walker)
2. 05:44 AM - Re: Transmitting causes transponder to turn off (Bill Bradburry)
3. 06:51 AM - Re: Transmitting causes transponder to turn off (Robert L. Nuckolls, III)
4. 08:29 AM - Re: Transmitting causes transponder to turn off (Robert L. Nuckolls, III)
5. 08:38 AM - Lightspeed Plasma III current curves (Robert L. Nuckolls, III)
6. 11:05 AM - Re: Transmitting causes transponder to turn off (Bill Bradburry)
7. 02:22 PM - Buy Apple Iphone 5 32GB $450/Apple iPad 4 4G 32GB $460 (kkmmee)
Message 1
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| Subject: | Transmitting causes transponder to turn off |
=0ABob.=0AFirst time it has happened in almost 500 hours of operation.=0A
=0AMy initial thought was that, as transmitting takes more power than just
receiving, it might be causing a power transient in the shared bus.=0AHow w
ould I check if this is the case?=0APatrick Elliott.=0AG-LGEZ=0A=0A=0A=0ATi
me: 05:35:06 PM PST US=0AFrom: "Robert L. Nuckolls, III" <nuckolls.bob@aero
electric.com>=0ASubject: Re: AeroElectric-List: Transmitting causes transpo
nder to turn- off=0A=0A=0AAt 01:16 PM 9/4/2013, you wrote:=0A>Bob, and o
thers.=0A>Wonder if you might comment on the following issue.=0A>Yesterday
while transmitting on our Garmin 530 the GTX 330 =0A>transponder turned its
elf off.=0A>This happened three times, before- it didn't happen again, st
range.=0A>They have separate power supply wires through fuses from the same
bus.=0A>Any ideas much appreciated.=0A=0A- - Has this ever happened be
fore? How many hours=0A- - on the system?=0A=0A=0A- Bob . . . =0A=0A
=========================0A
======================
Message 2
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| Subject: | Transmitting causes transponder to turn off |
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
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Linda
Walker
Sent: Thursday, September 05, 2013 4:37 AM
Subject: AeroElectric-List: Transmitting causes transponder to turn off
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
Time: 05:35:06 PM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: Re: AeroElectric-List: Transmitting causes transponder to turn off
At 01:16 PM 9/4/2013, you wrote:
>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.
Has this ever happened before? How many hours
on the system?
Bob href="http://www.matronics.com/Navigator?AeroElectric-List"
target="_btp://forums.matronics.com/"
target="_blank">http://forums.matronics.com
Message 3
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| Subject: | Re: Transmitting causes transponder to turn off |
At 03:36 AM 9/5/2013, you wrote:
>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
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 . . .
Message 4
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| Subject: | 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 . . .
Message 5
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| Subject: | Lightspeed Plasma III current curves |
It took awhile to find the plot . . . but here's a set
of curves for current draw taken in the laboratory on
a number of Plasma III ignition systems.
Emacs!
Bob . . .
Message 6
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| Subject: | Transmitting causes transponder to turn off |
Yes, GTX 327.
Bill
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Thursday, September 05, 2013 11:29 AM
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 . . .
Message 7
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