Thanks Jim,
I believe you are correct in all of your assumptions. and have confirmed
with "Poly fiber" that it will indeed interfere with radio transmissions.
Tim
----- Original Message -----
From: "JIM VANCE" <va...@claflinwildcats.com>
To: "krnet" <kr...@mylist.net>
Sent: Monday, November 03, 2003 7:38 AM
Subject: KR>Antennas
Tim,
I have two points. First, the ELT will transmit on 121.5 Mhz, right in the
middle of your comm frequencies. When the antennas are in close proximity,
it will send an extremely high level of power into the receiver. That might
fry it. The solution is to keep the ELT and comm antennas as far apart as
is possible.
Secondly, 90% of the signal is transmitted in the part of the antenna
nearest the feedpoint. The top half of the antenna is there to make it
resonant, but radiates only about 10% of the signal. If you in effect have
the majority of the antenna shielded, then your signal will bounce around
the inside of the plane like inside a microwave oven.
Have you thought about imbedding the antennas into the canopy? It might not
be vertical polarization, but at least it would radiate outside the plane.
Just a thought.
Jim Vance
va...@claflinwildcats.com
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