nuckollsr(at)cox.net
Guest
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 Posted: Fri Jun 15, 2007 3:44 am Post subject: Marker beacon antenna for composite aircraft |
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At 10:35 PM 6/14/2007 -0700, you wrote:
| Quote: |
<Dave(at)aircraftersllc.com>
Bob,
Would that 40" piece of wire work outside a metal airplane if the conductor
was insulated from the skin?
I'm thinking of a wire or tape laminated to the belly between layers
fiberglass.
For that matter, could you laminate an Archer antenna to the bottom of a
metal plane and expect it to work?
If no, why not?
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There needs to be some separation. A conductor laying right
next to a ground plane looks more like a transmission line
with high SWR than an antenna. The optimal belly mounted
marker beacon antenna for metal airplanes can be seen on
the 60-80's Cessnas. It's been affectionately dubbed "the
sled runner".
The more elegant antennas for metal airplanes are like
these from A/S.
http://www.aircraftspruce.com/catalog/avpages/comt_markerantennas2.php
One of my cohorts at Cessna was playing with a flush antenna
design. It had a slot in the belly skin about 2" wide and
extending between tail cone formers. The opening was closed
off outside with fiberglass and inside with a hat-section.
A tuned radiator was supported centrally within the hat-sections
profile.
I seem to recall it worked well but was pretty expensive
to build compared to the "sled runner" so was never incorporated
into our products.
Bob . . .
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