ndavis(at)tiptontel.com Guest
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Posted: Sat Feb 24, 2007 6:56 am Post subject: AeroElectric-List Digest: 18 Msgs - 02/23/07 |
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Bob,
Exactly what does your answer have to do with his question? I'm confused, I
don't think he wanted to use it as a com antenna, just vor/loc/gs...help me
here.
Nathan Davis
Quote: | Time: 09:10:59 PM PST US
From: "Robert L. Nuckolls, III" <nuckollsr(at)cox.net>
Subject: Re: Converting Old Cat Whisker Antenna To
VOR/LOC/GS
At 11:51 AM 2/23/2007 -0600, you wrote:
>
>Bob ...
>I have an old never installed cat whisker vor antenna. The whiskers are
>24" stainless molded into what looks to be bakelite. Two stainless #4
>studs protruding and go through a 1" diameter phenolic disk with nuts,
>check nuts and fiber lock nuts. The old, I mean old paper work,
>describes the antenna as vor 108-117.8 Mhz dated 1/76. It describes how
>not to drill holes where it says "DO NOT DRILL HOLES IN THIS AREA" (a
>rectangle molded into the bakelite). Mfd by The Antenna Specialists Co.
>
>My fondest hope is to modify the reception so as to receive vor/loc/gs ...
>can this be done and how? I have an antenna splitter from Ant to G/S and
>Nav. I can solder, follow directions, links and pointing if the lights
>are turned up bright.
A comm antenna is generally mounted vertically out the top or bottom of
the airplane
to most closely match the polarization of comm facilities both ground
based and
airborne (vertical). VOR/LOC/GS signals are horizontally polarized which
is why
you see the dual cat whiskers mounted in a horizontal plane on older
airplanes.
You can use the antenna you've described but with degrade performance.
The optimum
length for the VOR/LOC reception is LONGER than for a Comm antenna . . .
about 26".
So using this antenna as is will further degrade performance due to not
being centered
at the frequency band of interest.
Now, I can't quantify 'degraded' . . . you can give it a try, go fly it
and
see if it does what you need to have done. If you find that you're not
hearing
VOR stations as far out as you'd like, you'll have to do something
different.
LOC/GS signals are so strong that a wet string hung out the window would
probably work okay so I suspect you'll find the antenna is reasonably
useful off the approach end of a runway. Let us know what you discover.
Bob . . .
----------------------------------------
( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
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