Today's Message Index:
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0. 08:10 AM - [PLEASE READ] Why I Have A Fund Raiser... (Matt Dralle)
1. 03:17 AM - Re: z13/8 ess bus feed (mmcelrea)
2. 06:45 AM - Re: Re: Transponder antenna (Steve Stearns)
3. 09:05 AM - Re: Transponder antenna (Airdog77)
4. 01:19 PM - Re: Re: z13/8 ess bus feed (Robert L. Nuckolls, III)
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| Subject: | [PLEASE READ] Why I Have A Fund Raiser... |
Since the beginning, the Matronics List and Forum experience has been free from
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| Subject: | Re: z13/8 ess bus feed |
Thankyou Bob
I am building the aircraft with approval for IFR flight here in the UK and the
LAA are concerned about single failure points. Using the Z13.8 architecture is
it possible to monitor if the backup alternator is working, even if its not supplying?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=474874#474874
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| Subject: | Re: Transponder antenna |
A word of caution related to putting your transponder antenna inside your
cabin...
*IF* you are or will be using an ADS-B out 1090 MHz transponder on the
antenna in question be aware that it's output is enough different than the
non-ADS-B transponder that where the later would work with no problem, the
former may inject "ticks" into your audio.
My antenna is an exterior antenna just under my legs with a minimum (1/4
wave radius) circular ground plane (it's been tested and provides and
excellent match) and when I switched from a traditional transponder to a
Garmin GTX-335 ticks were introduced into the audio. I've got an otherwise
very tight and well performing audio install with very careful
consideration of grounds, returns etc.
I've debugged enough to be *quite* certain that the interference path is
from the energy radiated off of the antenna itself into the mic circuitry
on my panel mount Sigtronics intercom.
If you google a bit, you will discover that there are many people who
similarly had ticks introduced into their audio once they upgraded their
1090 MHz transponder to being ADS-B out capable.
Though I believe the real fix in my install will be to make my intercom
less sensitive to RF Field pulses, I'm still not considering moving my
transponder antenna inside as it would certainly make the problem worse...
I might consider it in the future once I mitigate the tick issue with it in
its current location.
Steve Stearns
Longeze N45FC
Boulder/Longmont CO.
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| Subject: | Re: Transponder antenna |
Steve,
Good to know!
And clearly, this is a lesson for me to be more clear... :)
> A word of caution related to putting your transponder antenna inside your cabin...
Although I know you're talking about the "old style" antenna, I plan on mounting
the L2 antenna at the outboard end of the strake at the junction with the wing.
Still quite a ways from the comm antenna in the vertical winglet, but also
a decent ways out from the pilot/GIB and cabin electronics.
Cheers,
Wade
--------
Airdog
Wade Parton
Building Long-EZ N916WP
www.longezpush.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=474955#474955
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| Subject: | Re: z13/8 ess bus feed |
At 05:16 AM 11/13/2017, you wrote:
>
>Thankyou Bob
>I am building the aircraft with approval for IFR flight here in the
>UK and the LAA are concerned about single failure points. Using the
>Z13.8 architecture is it possible to monitor if the backup
>alternator is working, even if its not supplying?
Not really . . . but demonstrated failure rates
on the SD8 used in standby service is essentially
zero. The system runs stone cold in normal flight
meaning that thermal wear/tear on components and materials
is zero, there are no brushes or slip rings. Further
system is both pre-flight and in=flight testable.
Don't know how you would get better reliability
numbers on an engine driven power source.
Bob . . .
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