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phtoxo
Joined: 09 Jun 2006
Posts: 3
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 Posted: Mon Nov 06, 2006 1:01 am Post subject: Questions |
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My homebuilt Pioneer 300 equipped with Rotax 912 ULS features a wooden structure for the fuselage, completely covered with a carbon-fibre shell. Wings and tailplane is made of a wooden structure with dacron covering.
The fuselage features carbon fibre belly panels for inspection purposes.
Questions: which type of antenna's should I use and how do I deal witth the grounding for these? (2x Comm, 1x Nav, 1x Xpond, 1x GPS)
How do I deal with the electric grounds - do I bring all the individual grounds to a ground block on the inside of the firewall?
Is it advisable to make a separate ground block for the avionics and connect this to the ground block on the inside of the firewall?
For starting, which is better - 2 single switches for the ignition and one starter button, or the interlinked 2 switches whereby the lft ignition switch is used for starting as well through off-on-(on) as shown on some Z-diagrams.
Is a back-up battery recommended and why?
Thanks for any input I may receive from this board.
Cees Smit, Germany
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nuckollsr(at)cox.net
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| Posted: Mon Nov 06, 2006 6:30 am Post subject: Questions |
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At 01:01 AM 11/6/2006 -0800, you wrote:
| Quote: |
My homebuilt Pioneer 300 equipped with Rotax 912 ULS features a wooden
structure for the fuselage, completely covered with a carbon-fibre shell.
Wings and tailplane is made of a wooden structure with dacron covering.
The fuselage features carbon fibre belly panels for inspection purposes.
Questions: which type of antenna's should I use and how do I deal witth
the grounding for these? (2x Comm, 1x Nav, 1x Xpond, 1x GPS)
How do I deal with the electric grounds - do I bring all the individual
grounds to a ground block on the inside of the firewall?
Is it advisable to make a separate ground block for the avionics and
connect this to the ground block on the inside of the firewall?
For starting, which is better - 2 single switches for the ignition and one
starter button, or the interlinked 2 switches whereby the lft ignition
switch is used for starting as well through off-on-(on) as shown on some
Z-diagrams.
Is a back-up battery recommended and why?
Thanks for any input I may receive from this board.
|
May I suggest you acquire a copy of the
AeroElectric Connection . . . a publication with
whole chapters that discuss topics you've cited.
If you have the Z-diagrams, then you already have
a sample of the document's usefulness. The Builder's
Bookstore offers an e-book version of the 'Connection
at http://buildersbooks.com/
You can print the e-book off as needed and on paper/
binder formats of choice. If you have questions
or having trouble selecting from multiple philosophies
then there's a bunch of folks here on the List who
can help you. It's a good idea to ground your
questions in some level of pre-understanding before
we here on the List begin to expound on our various
preferences levels of understanding.
Bob . . .
---------------------------------------------------------
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
---------------------------------------------------------
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phtoxo
Joined: 09 Jun 2006
Posts: 3
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| Posted: Mon Nov 06, 2006 7:19 am Post subject: Re: Questions |
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Sorry Bob, didn't mean to offend any. It is just that most of my questions are somewhat covered, I was looking for more precise answers and why, especially the antennae questions. E.g. is it better to use a bent whip on the belly and try to get a ground plane on the carbon fiber or is it better to use a antennae for composite and built it in the rudder. Why is it better and how do I get the ground for this composite antennae?
I'll try to be more precise with my questioning in the future.
Regards, Cees Smit.
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nuckollsr(at)cox.net
Guest
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| Posted: Mon Nov 06, 2006 8:41 pm Post subject: Questions |
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At 07:19 AM 11/6/2006 -0800, you wrote:
| Quote: |
Sorry Bob, didn't mean to offend any. It is just that most of my questions
are somewhat covered, I was looking for more precise answers and why,
especially the antennae questions. E.g. is it better to use a bent whip on
the belly and try to get a ground plane on the carbon fiber or is it
better to use a antennae for composite and built it in the rudder. Why is
it better and how do I get the ground for this composite antennae?
I'll try to be more precise with my questioning in the future.
|
No problem . . . and if anyone took offense at your
question, that's their problem . . . not yours.
Now that I understand your question better, I'll try to
be more concise as well.
Any antenna mounted in proximity to a conductor that
is NOT specifically designed to be part of the antenna
(i.e. carbon fin) is going to degrade the performance
of that antenna from the "ideal" uniformly circular
pattern. Carbon fiber as a less than ideal conductor
will turn part of your radiated signal into heat instead
of allowing it to propagate un-attenuated to the listener's
antenna and receiver.
Generally speaking, mounting the antenna into the vertical
fin is demonstrably poorer performing that one perched
on a good ground plane and relatively clear of parasitic
conductors.
If it were my airplane, I'd go for a top or bottom mount
on the fuselage with ground plane radials added to the
inside surface of the carbon fiber. This is going to
produce the very best we know how to do on the decidedly
limiting situation that is the light aircraft.
Bob . . .
---------------------------------------------------------
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
---------------------------------------------------------
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http://www.matronics.com/Navigator?AeroElectric-List |
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