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Dennis Johnson
Joined: 10 Jan 2006
Posts: 89
Location: N. Calif.
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 Posted: Wed Feb 07, 2007 5:00 pm Post subject: Antenna in Wingtip |
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Greetings,
I have what sounds like a similar antenna embedded in my fiberglass wingtip in an otherwise carbon fiber airplane (Lancair Legacy). The kit came with the antenna already installed. I have the same two threaded studs sticking up inside the wingtip. I believe the antenna is a "Bob Archer" style antenna that does not require a ground plane, sort of like these:
http://www.aircraftspruce.com/catalog/avpages/archer_antennas.php
I didn't think polarity mattered when I connected the coax to the studs, but I get a really loud "white noise" sound when I try to listen to a VOR identifier. I've just hooked up the audio panel and haven't had the time to troubleshoot it yet. Maybe I'll snake my hand back in there and swap the two connections and see if that helps.
Best,
Dennis Johnson
First engine start yesterday!
[quote][b]
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N6030X(at)DaveMorris.com
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| Posted: Wed Feb 07, 2007 5:56 pm Post subject: Antenna in Wingtip |
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If it is a Bob Archer wingtip antenna, the center conductor and braid
definitely have specific places to go. The center conductor feeds
the longer piece, and the braid the shorter one. Check the
installation diagram.
Dave Morris
At 06:56 PM 2/7/2007, you wrote:
| Quote: | Greetings,
I have what sounds like a similar antenna embedded in my fiberglass
wingtip in an otherwise carbon fiber airplane (Lancair Legacy). The
kit came with the antenna already installed. I have the same two
threaded studs sticking up inside the wingtip. I believe the
antenna is a "Bob Archer" style antenna that does not require a
ground plane, sort of like these:
<http://www.aircraftspruce.com/catalog/avpages/archer_antennas.php>http://www.aircraftspruce.com/catalog/avpages/archer_antennas.php
I didn't think polarity mattered when I connected the coax to the
studs, but I get a really loud "white noise" sound when I try to
listen to a VOR identifier. I've just hooked up the audio panel and
haven't had the time to troubleshoot it yet. Maybe I'll snake my
hand back in there and swap the two connections and see if that helps.
Best,
Dennis Johnson
First engine start yesterday!
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khorton01(at)rogers.com
Guest
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| Posted: Wed Feb 07, 2007 6:30 pm Post subject: Antenna in Wingtip |
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On 7 Feb 2007, at 19:56, Dennis Johnson wrote:
| Quote: | Greetings,
I have what sounds like a similar antenna embedded in my fiberglass
wingtip in an otherwise carbon fiber airplane (Lancair Legacy).
The kit came with the antenna already installed. I have the same
two threaded studs sticking up inside the wingtip. I believe the
antenna is a "Bob Archer" style antenna that does not require a
ground plane, sort of like these:
http://www.aircraftspruce.com/catalog/avpages/archer_antennas.php
|
The ACS page says that the antennae are designed to be installed in
"metal or other conductive material aircraft". I wonder if there is
a copper strip ground plane embedded in the layups where the inboard
end of the antenna is attached. Or, maybe, it is a different antenna.
Kevin Horton RV-8 (finishing kit)
Greely, ON
http://www.kilohotel.com/rv8
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N6030X(at)DaveMorris.com
Guest
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| Posted: Wed Feb 07, 2007 8:32 pm Post subject: Antenna in Wingtip |
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It doesn't use a ground plane. It's more like a modified J-pole I think.
Dave Morris
At 08:29 PM 2/7/2007, you wrote:
| Quote: |
On 7 Feb 2007, at 19:56, Dennis Johnson wrote:
>Greetings,
>
>I have what sounds like a similar antenna embedded in my fiberglass
>wingtip in an otherwise carbon fiber airplane (Lancair Legacy).
>The kit came with the antenna already installed. I have the same
>two threaded studs sticking up inside the wingtip. I believe the
>antenna is a "Bob Archer" style antenna that does not require a
>ground plane, sort of like these:
>
>http://www.aircraftspruce.com/catalog/avpages/archer_antennas.php
The ACS page says that the antennae are designed to be installed in
"metal or other conductive material aircraft". I wonder if there is
a copper strip ground plane embedded in the layups where the inboard
end of the antenna is attached. Or, maybe, it is a different antenna.
Kevin Horton RV-8 (finishing kit)
Greely, ON
http://www.kilohotel.com/rv8
|
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nuckollsr(at)cox.net
Guest
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| Posted: Sat Feb 10, 2007 10:21 am Post subject: Antenna in Wingtip |
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At 10:31 PM 2/7/2007 -0600, you wrote:
| Quote: |
It doesn't use a ground plane. It's more like a modified J-pole I think.
Dave Morris
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But a j-pole has two elements, on a 1/2 and the other 1/4 wavelength long
. . . and wouldn't fit under a wing tip fairing.
Bob . . .
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sportav8r(at)gmail.com
Guest
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| Posted: Sat Feb 10, 2007 1:34 pm Post subject: Antenna in Wingtip |
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You'll never tune an Archer wingtip antenna without connection to the
metal end rib of the wing; believe me, this fool has tried, also
thinking it was like a J-pole. It is not.
Ended up chasing the resonance of the mounting leg all over the place
until I had trimmed it all way too short and had to start over.
Bonding the base leg to the airframe tames the beast rather well.
Shadowing by the airframe WILL be an issue in an RV, though. I have
proved that much to myself.
-Bill B
On 2/10/07, Robert L. Nuckolls, III <nuckollsr(at)cox.net> wrote:
| Quote: |
At 10:31 PM 2/7/2007 -0600, you wrote:
>
>
>It doesn't use a ground plane. It's more like a modified J-pole I think.
>
>Dave Morris
But a j-pole has two elements, on a 1/2 and the other 1/4 wavelength long
. . . and wouldn't fit under a wing tip fairing.
Bob . . .
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n395v
Joined: 10 Jan 2006
Posts: 450
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| Posted: Sat Feb 10, 2007 7:38 pm Post subject: Re: Antenna in Wingtip |
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I suspect you have a Bob Archer antenna made for a metal plane like an RV. Most Nav antennas in glass planes need to be placed in the belly or upper fuselage due to space requirements.
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