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Re: ELT Antenna Length

 
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tinnemaha(at)hotmail.com
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PostPosted: Tue Jan 10, 2006 8:46 am    Post subject: Re: ELT Antenna Length Reply with quote


Bob et al,
I'm trying to mount the antenna inside the airfoiled section of my vertical
stabilizer, just above my ELT. The wood ribs on the vertical stabilizer are
oriented horizontally. It is a tube & fabric airplane with the vertical
stabilizer already covered. The fuselage is not yet covered. I want to
mount the base of the antenna in the fuselage & extend the antenna up into
the already covered portion of the vert stab.
The antenna that came with my ELT has a ~3" high rubber cone at the base out
of which extends about 18 more inches of small diameter metal rod. I
drilled small holes in the bottom two ribs of the stabilizer, but the third
one I can't reach with a drill bit. So I got the hair brained idea of just
cutting off ~1.5 inches of the antenna.
I'm open to any suggestions, but moving the location of the antenna is
highly UN desirable to me
I read the post about using a 'rubber ducky' antenna, but have no idea what
one is & can't find any reference in the A/C Spruce catalog.
Thanks for the attention already given,
Grant
Time: 07:21:43 PM PST US
From: "Robert L. Nuckolls, III" <nuckollsr(at)cox.net>
Subject: Re: AeroElectric-List: ELT Antenna Length
<nuckollsr(at)cox.net>
Grant,
Is this antenna "inside" or does it mount out in the breeze?
Bob . . .
At 12:01 PM 1/9/2006 -0800, you wrote:
<skywagon(at)charter.net>
Grant,
If you were able to add a "loading" coil to the antenna correctly, this
would allow you to shorten the current antenna. You would need a guru type
friend that knew antennas to accomplish this for you. However, I would bet
that a search of the web via Google would find a manufacturer that makes
the
"loaded" antennas for the frequency that you need.
David


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BobsV35B(at)aol.com
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PostPosted: Tue Jan 10, 2006 8:59 am    Post subject: Re: ELT Antenna Length Reply with quote



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skywagon(at)charter.net
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PostPosted: Tue Jan 10, 2006 9:16 am    Post subject: Re: ELT Antenna Length Reply with quote


Can't you locate or make an extra long drill bit to bore the last hole by
welding on a bit extension?
I would not advise cutting the antenna especially if it is a dual frequency
antenna as Bob described.
Something else to consider. In a crash, and especially an upset, you want
that antenna to survive. If the vertical stab is heavily damaged or torn
away, will the antenna remain intact?
I have wondered about a method to install 2 ELT antenna's. One on top and
one on the bottom for the situation where one gets heavily damaged or
scraped off. But, the interface to two antennas with a single transmitter
is beyond my understanding concerning the impedance matching problems with 1
or 2 surviving antennas. I have also wondered about installing 2 ELT's with
separate antennas, each in a different location hoping that one or both
survive. But, then there is the problem of them both being activated and
how that double transmission on the same frequency(s) would effect the folks
that are trying to locate you.
David


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mprather(at)spro.net
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PostPosted: Tue Jan 10, 2006 9:47 am    Post subject: Re: ELT Antenna Length Reply with quote


Maybe have a look at this..
http://www.aircraftspruce.com/catalog/avpages/vertex antenna.php
Regards,
Matt-
<tinnemaha(at)hotmail.com>
Bob et al,
I'm trying to mount the antenna inside the airfoiled section of my
vertical stabilizer, just above my ELT. The wood ribs on the vertical
stabilizer are oriented horizontally. It is a tube & fabric airplane
with the vertical stabilizer already covered. The fuselage is not yet
covered. I want to mount the base of the antenna in the fuselage &
extend the antenna up into the already covered portion of the vert
stab.
The antenna that came with my ELT has a ~3" high rubber cone at the base
out of which extends about 18 more inches of small diameter metal rod.
I drilled small holes in the bottom two ribs of the stabilizer, but the
third one I can't reach with a drill bit. So I got the hair brained
idea of just cutting off ~1.5 inches of the antenna.
I'm open to any suggestions, but moving the location of the antenna is
highly UN desirable to me
I read the post about using a 'rubber ducky' antenna, but have no idea
what one is & can't find any reference in the A/C Spruce catalog.
Thanks for the attention already given,
Grant
Time: 07:21:43 PM PST US
From: "Robert L. Nuckolls, III" <nuckollsr(at)cox.net>
Subject: Re: AeroElectric-List: ELT Antenna Length
<nuckollsr(at)cox.net>
Grant,
Is this antenna "inside" or does it mount out in the breeze?
Bob . . .
At 12:01 PM 1/9/2006 -0800, you wrote:
><skywagon(at)charter.net>
>
>Grant,
>If you were able to add a "loading" coil to the antenna correctly, this
> would allow you to shorten the current antenna. You would need a guru
> type friend that knew antennas to accomplish this for you. However, I
> would bet that a search of the web via Google would find a manufacturer
> that makes the
>"loaded" antennas for the frequency that you need.
>David
>
>


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nuckollsr(at)cox.net
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PostPosted: Tue Jan 10, 2006 11:23 am    Post subject: Re: ELT Antenna Length Reply with quote


At 08:46 AM 1/10/2006 -0800, you wrote:
Bob et al,
I'm trying to mount the antenna inside the airfoiled section of my vertical
stabilizer, just above my ELT. The wood ribs on the vertical stabilizer are
oriented horizontally. It is a tube & fabric airplane with the vertical
stabilizer already covered. The fuselage is not yet covered. I want to
mount the base of the antenna in the fuselage & extend the antenna up into
the already covered portion of the vert stab.
The antenna that came with my ELT has a ~3" high rubber cone at the base out
of which extends about 18 more inches of small diameter metal rod. I
drilled small holes in the bottom two ribs of the stabilizer, but the third
one I can't reach with a drill bit. So I got the hair brained idea of just
cutting off ~1.5 inches of the antenna.
I'm open to any suggestions, but moving the location of the antenna is
highly UN desirable to me
I read the post about using a 'rubber ducky' antenna, but have no idea what
one is & can't find any reference in the A/C Spruce catalog.
Thanks for the attention already given,

Are you planning any kind of ground plane under the
antenna? You'd like to see a some "radials" like those
illustrated in the 'Conection on page 13-10. Even if
two or three (one going forward and two to either side
on the stabilizer?).
Getting the antenna portion shortened a tad is not
a big deal . . . but you need some radials too. Got
any ideas how to make this happen?
Bob . . .

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