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riddon(at)sent.com
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 Posted: Tue Mar 13, 2012 10:38 pm Post subject: Transponder aerial |
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| Quote: | > I am planning to fit a Mode S transponder. My current setup is a Microair T2000 which has worked OK but occasionally ground stations report no signal so I would like to look at improving my aerial setup at the same time. I plan to upgrade the coax from RG58 to RG400. My current ground plane is an aluminium plate about 8in diameter, half moon shape with a lip which is fixed behind the baggage bay bulkhead.
>
> Suggestions for improvement from those with more knowledge on the black art of radio waves?
>
> Richard Iddon
>
> G-RIXS
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davidjoyce(at)doctors.org
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| Posted: Wed Mar 14, 2012 12:00 am Post subject: Transponder aerial |
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Richard, my mode S transponder and it's predecessor has
always worked well with a Bob Archer aerial mounted
vertically on the plywood tower that confines the tail
plane counterweight. It is a small flat aerial without a
ground plane, as I recall.
Regards, David
On Wed, 14 Mar 2012 06:37:22 +0000
Richard Iddon <riddon(at)sent.com> wrote:
| Quote: |
<riddon(at)sent.com>
>> I am planning to fit a Mode S transponder. My current
>>setup is a Microair T2000 which has worked OK but
>>occasionally ground stations report no signal so I would
>>like to look at improving my aerial setup at the same
>>time. I plan to upgrade the coax from RG58 to RG400. My
>>current ground plane is an aluminium plate about 8in
>>diameter, half moon shape with a lip which is fixed
>>behind the baggage bay bulkhead.
>>
>> Suggestions for improvement from those with more
>>knowledge on the black art of radio waves?
>>
>> Richard Iddon
>>
>> G-RIXS
Un/Subscription,
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Admin.
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europabill(at)bellsouth.n
Guest
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| Posted: Wed Mar 14, 2012 2:31 am Post subject: Transponder aerial |
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Richard,
The ground plan should be a full circle.
Bill
A010 Monowheel Classic
Still Building.......
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ptag.dev(at)tiscali.co.uk
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| Posted: Wed Mar 14, 2012 2:58 am Post subject: Transponder aerial |
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Hi! Richard,
My aerial for the transponder is a small rod with a chrome knob on the end
pointing down out of the bottom of the plane but I have a piece of aluminium
which is laid round the base of the fuselage and almost up the sides as a
ground plane. It is the same aerial as I used for the original Mode c
Transponder.
Bob H G-PTAG
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jimpuglise(at)comcast.net
Guest
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| Posted: Wed Mar 14, 2012 5:29 am Post subject: Transponder aerial |
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Richard-
I am using an AAE antenna and it works fine. It is a folded dipole mounted vertically. It is mounted on a piece of balsa wood FLOXed to the inside of the fuselage near the bulkhead containing the elevator weights. RG-400 is a good idea too. With a vertical dipole you do not need a counterpoise. The AAE antenna has a BNC connector already fitted, so you just FLOX it in and you are good to go. I think the Bob Archer antenna is similar.
Jim Puglise
N283JL
From: "Richard Iddon" <riddon(at)sent.com>
To: "Europa Forum" <europa-list(at)matronics.com>
Sent: Wednesday, March 14, 2012 2:37:22 AM
Subject: Transponder aerial
--> Europa-List message posted by: Richard Iddon <riddon(at)sent.com>
| Quote: | > I am planning to fit a Mode S transponder. My current setup is a Microair T2000 which has worked OK but occasionally ground stations report no signal so I would like to look at improving my aerial setup at the same time. I plan to upgrade the coax from RG58 to RG400. My current ground plane is an aluminium plate about 8in diameter, half moon shape with a lip which is fixed behind the baggage bay bulkhead.
>
> Suggestions for improvement from those with more knowledge on the black art of radio waves?
>
> Richard Ibsp; - MATRONICS WEB FORUMS -
====
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[quote][b]
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