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ron.mcgann(at)baesystems.
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 Posted: Mon Oct 16, 2006 10:55 pm Post subject: Top Mount Antennas |
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G'day all,
I'm about to take a drill to the foward tailcone skin to install an AV-10 comms antenna (comm 2). I also have an AV-17 on the belly.
The AV-10 will be located baout 8" aft of the turtledeck/tailcone join. Any opinions on radiation penetration through the fiberglass lid and possible RFI induced in the panel? Would a foil ground plane beneath the headliner be useful?
cheers,
Ron
#187
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flysrv10(at)gmail.com
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| Posted: Tue Oct 17, 2006 2:56 am Post subject: Top Mount Antennas |
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My concern would be the lack of ground plane. You need a diameter about twice the length of the antenna for ground plane (ideally). If you provide a foil below in the cabin, be (at)#% sure that you have a good ground from the antenna base to the foil. Better yet, consider attaching the antenna to the tail cone. Of course you can't go wrong by installing both antennas below the belly.
Antenna location and RFI is part art, part science. Hard to predict what it will do to your panel. Mimic antenna locations you find on production planes parked on the ramp.
do not archive
Rob
On Oct 17, 2006, at 2:53 AM, McGANN, Ron wrote:
[quote]G'day all,
I'm about to take a drill to the foward tailcone skin to install an AV-10 comms antenna (comm 2). I also have an AV-17 on the belly.
The AV-10 will be located baout 8" aft of the turtledeck/tailcone join. Any opinions on radiation penetration through the fiberglass lid and possible RFI induced in the panel? Would a foil ground plane beneath the headliner be useful?
cheers,
Ron
#187
[b]
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jesse(at)itecusa.org
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| Posted: Tue Oct 17, 2006 5:32 am Post subject: Top Mount Antennas |
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Mimic antenna locations you find on production planes parked on the ramp? When I look down the ramp, my plane is the only one with no antenna clutter on the top. Most of them have 2-6 antennas somewhere on the top and I have none. Beyond that, antenna placement on the belly on the ramp is a good place to start. I personally like the clean top look.
Do not archive.
Jesse Saint
I-TEC, Inc.
jesse(at)itecusa.org (jesse(at)itecusa.org)
www.itecusa.org
W: 352-465-4545
C: 352-427-0285
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Rob Kermanj
Sent: Tuesday, October 17, 2006 6:53 AM
To: rv10-list(at)matronics.com
Subject: Re: Top Mount Antennas
My concern would be the lack of ground plane. You need a diameter about twice the length of the antenna for ground plane (ideally). If you provide a foil below in the cabin, be (at)#% sure that you have a good ground from the antenna base to the foil. Better yet, consider attaching the antenna to the tail cone. Of course you can't go wrong by installing both antennas below the belly.
Antenna location and RFI is part art, part science. Hard to predict what it will do to your panel. Mimic antenna locations you find on production planes parked on the ramp.
do not archive
Rob
On Oct 17, 2006, at 2:53 AM, McGANN, Ron wrote:
G'day all,
I'm about to take a drill to the foward tailcone skin to install an AV-10 comms antenna (comm 2). I also have an AV-17 on the belly.
The AV-10 will be located baout 8" aft of the turtledeck/tailcone join. Any opinions on radiation penetration through the fiberglass lid and possible RFI induced in the panel? Would a foil ground plane beneath the headliner be useful?
cheers,
Ron
#187
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10/16/2006
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10/16/2006
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Jack.Phillips(at)cardinal
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| Posted: Tue Oct 17, 2006 5:50 am Post subject: Top Mount Antennas |
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In the “For What it’s Worth” departement, I just finished the condition inspection of my RV-4. The previous owner had a Loran installed, which didn’t come with the airplane but its antenna (and associated cabling) was still installed. I removed the antenna and cable during the condition inspection and found that I picked up nearly 5 mph in cruise speed. This antenna had a teardrop shaped base, with a whip that extended swept back about 45 degrees to a height of about 12” above the turtledeck of the airplane (behind the canopy), and then continued aft about 18” parallel to the turtledeck. Total weight of the antenna and cable was about 3 lbs.
Based on this experience, I will do everything possible to keep my antennas buried, or will use blade type antennas if projecting out into the slipstream. A blade has a much lower drag coefficient than a round rod.
Jack Phillips
# 40610
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