Today's Message Index:
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1. 01:51 AM - Transmitting causes transponder to turn off (Linda Walker)
2. 06:16 AM - Re: Transmitting causes transponder to turn off (Robert L. Nuckolls, III)
3. 08:43 AM - Re: Lightspeed Plasma III current curves (hotwheels)
4. 09:35 AM - Re: Lightspeed Plasma III current curves (jonlaury)
5. 10:20 AM - Re: Lightspeed Plasma III current curves (Peter Pengilly)
6. 08:48 PM - Re: Lightspeed Plasma III current curves (nuckollsr)
Message 1
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| Subject: | Transmitting causes transponder to turn off |
Bob.=0AElectrical 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 bat
tery, sized for long overwater legs.=0AI have the Vision MicroSystems VM100
0 engine display that includes a voltmeter, which on recent examination is
reading incorrectly.=0AI am about to do a test flight with a multimeter tem
porarily in place to read what the VMS should be reading, and will report b
ack.=0AThanks for your help.=0APatrick Elliott.=0AG-LGEZ=0A=0A=0A=0A=0A____
____________________________=0A=0A________________________________- Messa
ge 3- _____________________________________=0A=0A=0ATime: 06:51:17 AM PST
US=0AFrom: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>=0ASub
ject: Re: AeroElectric-List: Transmitting causes transponder to turn- of
f=0A=0A=0AAt 03:36 AM 9/5/2013, you wrote:=0A=0A>Bob.=0A>First time it has
happened in almost 500 hours of operation.=0A>=0A>My initial thought was th
at, as transmitting takes more power than =0A>just receiving, it might be c
ausing a power transient in the shared bus.=0A>How would I check if this is
the case?=0A>Patrick Elliott.=0A>G-LGEZ=0A=0A- - Can you describe the
architecture of your electrical=0A- - system? Alternator and battery si
zes . . . what kind=0A- - of airplane? Do you have a voltmeter in the a
irplane=0A- - and are the reading(s) normal?=0A=0A- - The added loa
d on a bus by the transmitter is a pittance=0A- - compared to the size
of your alternator . . . there's=0A- - no rational reason for an 'overl
oad' condition. If=0A- - it were an overloading situation, then turning
on your=0A- - landing lights (assuming incandescent lamps) would=0A-
- impose a transient many times greater on the bus . . .=0A- - but a
transient that Garmin says is no big deal by=0A- - virtue of their DO-
160 qualification testing.=0A=0A=0A- Bob . . .
Message 2
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| Subject: | Re: Transmitting causes transponder to turn off |
At 03:50 AM 9/6/2013, you wrote:
>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
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 . . .
Message 3
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| Subject: | Re: Lightspeed Plasma III current curves |
I have dual LSE Plasma IIIs. Here are the current draw numbers Klaus shared recently
for Box version "B". Your mileage may vary depending upon box vintage...
Box on, engine off: ~0.2A
Engine at idle power: ~0.8-0.9A
Engine at cruise power: ~2A
Regards,
Jay
N433RV RV-10 ... Flying!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=408157#408157
Message 4
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| Subject: | Re: Lightspeed Plasma III current curves |
As Jay uses the singular "Box Version B". I assume the current draw would be double
for dual LSE III's . Correct?
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=408160#408160
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| Subject: | Re: Lightspeed Plasma III current curves |
Message 6
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| Subject: | Re: Lightspeed Plasma III current curves |
2.0 at 'cruise' is consistent with the data taken assuming that you cruise at 2200
rpm and the electronics package is in a 75F ambient.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=408188#408188
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