Bob,
I work in a part of British Aerospace which designs and manufactures
composite nose radomes for aircraft I had the Europa composite material on
the roof run through our performance simulation programme. All assume 1.2
GHz. Angles of incidence are between a line joining antenna face to
satellite and a line normal (perpendicular) to the surface of the composite.
Incidence 0 deg loss 0.0199 dB
10 deg loss 0.0204 dB
20 deg loss 0.0219 dB
30 deg loss 0.0249 dB
40 deg loss 0.0303 dB
50 deg loss 0.0404 dB
60 deg loss 0.0615 dB
All are negligible.
BTW take care to protect (locate separately or screen) the GPS antenna cable
---From your comms. antenna. Many GPS receivers radiate RF interference and
this applies to their antenna leads as well. Just try yours out first with
a hand held and rubber duck as a sensor.
Dave Simpson
-----Original Message-----
From: Bob Jacobsen <info@galaxyhobby.com>
Date: 27 August 1999 13:02
Subject: GPS Antenna
I am trying to decide how I need to mount my GPS antenna and need some
advice. Can I mount the antenna beneath the aircraft skin or do I need to
cut a hole and bond it through. I was thinking of the area between the
doors as a location.
Don't want to cut the hole if I don't have to and would appreciate and
advice/experience that you all may have. I will be using a Magellan EC-20
with a remote antenna.
Thanks for your help.
Bob Jacobsen
Seattle, WA
A131
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