Today's Message Index:
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1. 07:19 AM - Re: Antenna ground plane and nearby cables (jonlaury)
2. 08:58 AM - Re: Re: Antenna ground plane and nearby cables (Robert L. Nuckolls, III)
3. 08:58 AM - Around the world again... (Jay Hyde)
Message 1
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Subject: | Re: Antenna ground plane and nearby cables |
> No, antennas on the outside of the airplane
> sitting on an existing groundplane (skin
> or tubular structure) or manufactured ground-
> plane are not influenced by adjacent wires
> on the other side of the groundplane.
>
Bob, I mounted my xpdr antenna on a 6" diameter ground plane inside my composite
plane. The tail strobe wire is about 12" away from the antenna. Would you expect
problems with this installation?
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=349111#349111
Message 2
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Subject: | Re: Antenna ground plane and nearby cables |
At 09:15 AM 8/10/2011, you wrote:
>
>
> > No, antennas on the outside of the airplane
> > sitting on an existing groundplane (skin
> > or tubular structure) or manufactured ground-
> > plane are not influenced by adjacent wires
> > on the other side of the groundplane.
> >
>
>
>Bob, I mounted my xpdr antenna on a 6" diameter ground plane inside
>my composite plane. The tail strobe wire is about 12" away from the
>antenna. Would you expect problems with this installation?
Define "problems". There will be an effect.
Whether strong enough to offer an observable
difference is subject to much conjecture and
discussion . . . but never quantified without
competent analysis, accurately measured
experimentation or both.
Not trying to be obtuse . . . even the 'big
guys' know few facts that go to your question.
Education is expensive and they're so busy
fighting big fires that mundane details
like performance anomalies in antenna installations
take a distant back seat.
This has been known to come back and 'bite'
in expensive and embarrassing ways later. I
could expound on those war-stories for hours.
Bottom line is, try it. Make notes of situations
where ATC says your transponder is intermittent
or unreadable under conditions where you believe
it shouldn't be a problem. Competent observation
and connection of the dots will out-weigh any
amount of supposition/conjecture on the forums.
But if it worries you, then do the legacy hang-
it-out-the-bottom installation that has proven
to be the best-we-know-how-to-do.
Bob . . .
Message 3
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Subject: | Around the world again... |
Hi there everyone,
A couple of years ago two mates of mine, Mike Blyth and James Pitman, flew
from Johannesburg, South Africa to Oshkosh, Wisconsin, USA and then
continued around the world back to SA. The flight was an epic and record
breaking one involving two 20+hour crossings over the Atlantic and Pacific
oceans. The flew around the world in 38 days in a light sport aircraft that
they had designed and built, with the aim of selling these as kits or ready
built aircraft. Their aircraft, called the Sling, is a 2 seater, low wing,
all aluminium aircraft powered by a Rotax 912 engine which proved its
reliability over the long over water stretches of the trip.
Two years later, and some 27 orders of aircraft later, they and their new
business partner, Jean Dasonville, are now doing it all again; this time
from west to east - but now in their new 4 seater, christened, 'Silver
Bullit', which is an enlarged version of their 2 seater, comfortably seating
4. They took off from Johannesburg on Sunday, headed for Reunion Island,
with their 450 litre tanks (the whole leading edges of each wing are fuel
tanks) filled to the brim. They landed safely and will take off on their
next leg tomorrow morning at 4am SA time- this time a 24 hour flight to
Colombo, Sri Lanka. They had planned to stop off at the Maldives on the way
but there is only 80 octane MOGAS available in the Maldives so they are
going to try and push through.
Its an epic adventure; iced wings on the first night and now extended legs
because of fuel availability..
If you would like to read more about it have a look at
http://www.airplanefactory.co.za/sling4atw_news.asp
Jay Hyde
South Africa
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HH Enterprises
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Blog: www.rawhyde.wordpress.com
Cel: 083 300 8675
Email: jay@horriblehyde.com
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