clstroh(at)yahoo.com
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 Posted: Fri Apr 15, 2022 5:55 am Post subject: AeroElectric-List Digest: 6 Msgs - 04/13/22 |
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If you have TCAS you already have a transponder that has an antenna on the top and bottom of the aircraft.
On Thursday, April 14, 2022, 07:00:15 PM CDT, AeroElectric-List Digest Server <aeroelectric-list(at)matronics.com> wrote:
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AeroElectric-List Digest Archive
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Total Messages Posted Wed 04/13/22: 6
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Today's Message Index:
----------------------
1. 07:38 AM - Re: Transponder antenna ground plane (Eric Page)
2. 09:22 AM - Re: Re: Transponder antenna ground plane (Robert L. Nuckolls, III)
3. 10:35 AM - Re: Re: Transponder antenna ground plane (Charlie England)
4. 11:37 AM - A fascinating watch . . . (Robert L. Nuckolls, III)
5. 11:52 AM - Re: A fascinating watch . . . (Daniel Clark)
6. 01:13 PM - Re: A fascinating watch . . . (Bill Settle)
________________________________ Message 1 _____________________________________
Time: 07:38:49 AM PST US
Subject: Re: Transponder antenna ground plane
From: "Eric Page" <edpav8r(at)yahoo.com (edpav8r(at)yahoo.com)>
Yes, I seem to remember reading something about that. I have no plans to fly into
Canada, but I wonder what will be required, hardware-wise, to satisfy their
requirement. I presume you would need a transponder designed for multiple antennas.
It looks like uAvionix's tailBeaconX satisfies the Canadians, but beyond
that, I have no idea!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=506545#506545
________________________________ Message 2 _____________________________________
Time: 09:22:21 AM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>
Subject: Re: Re: Transponder antenna ground plane
At 09:41 PM 4/12/2022, you wrote:
| Quote: | Next year Canada is going to require aircraft flying in Class A & B
|
| Quote: | airspace to be able to send transponder signals to satellites. This
|
| Quote: | requirement can be met either through antenna diversity (the use of
|
| Quote: | a top and bottom antenna) or with a single antenna that is capable
|
| Quote: | of transmitting both towards the ground and up towards satellites.
|
| Quote: | I have never seen transponder antennas on top of airplanes
|
| Quote: | either. But chances are that an antenna on top would work just as
|
| Quote: | well as one on the bottom.
|
The quater-wave, ground-plane antenna has a
radiation patter like shown in this illustration.
Very attenuated response 'below' the ground plane.
Probably even more attenuation on a 'large' ground
plane like an aircraft skin.
Looking at the elevation pattern we see the major
lobe is displaced about 30 degrees off the ground
plane . . . i.e. favoring ground based stations
when mounted upside down. Response out to the
horizon is only down 3db . . .
Talking to satellites? Got any links to
expand on that? I'm wondering what service is
expected to use xponder data . . . and for
what purpose.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
________________________________ Message 3 _____________________________________
Time: 10:35:42 AM PST US
Subject: Re: AeroElectric-List: Re: Transponder antenna ground plane
From: Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)>
On 4/13/2022 11:17 AM, Robert L. Nuckolls, III wrote:
| Quote: | At 09:41 PM 4/12/2022, you wrote:
|
| Quote: | > Next year Canada is going to require aircraft flying in Class A & B
|
| Quote: | > airspace to be able to send transponder signals to satellites. This
|
| Quote: | > requirement can be met either through antenna diversity (the use of a
|
| Quote: | > top and bottom antenna) or with a single antenna that is capable of
|
| Quote: | > transmitting both towards the ground and up towards satellites.
|
| Quote: | > I have never seen transponder antennas on top of airplanes either.
|
| Quote: | > But chances are that an antenna on top would work just as well as one
|
| Quote: | The quater-wave, ground-plane antenna has a
|
| Quote: | radiation patter like shown in this illustration.
|
| Quote: | Very attenuated response 'below' the ground plane.
|
| Quote: | Probably even more attenuation on a 'large' ground
|
| Quote: | plane like an aircraft skin.
|
| Quote: | Looking at the elevation pattern we see the major
|
| Quote: | lobe is displaced about 30 degrees off the ground
|
| Quote: | plane . . . i.e. favoring ground based stations
|
| Quote: | when mounted upside down. Response out to the
|
| Quote: | horizon is only down 3db . . .
|
| Quote: | Talking to satellites? Got any links to
|
| Quote: | expand on that? I'm wondering what service is
|
| Quote: | expected to use xponder data . . . and for
|
It's just ADS-B, with a/c transmissions received by satellites. To the
FAA: Can I get a 'duh...'?
https://aireon.com/resources/overview-materials/its-just-ads-b/
Charlie
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________________________________ Message 4 _____________________________________
Time: 11:37:52 AM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>
Subject: A fascinating watch . . .
Get a bowl of popcorn and a large enough jug to last
80 minutes. Found this documentary to be rather
spell binding . . .
https://youtu.be/2ayA2UE-p8M
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
________________________________ Message 5 _____________________________________
Time: 11:52:46 AM PST US
Subject: Re: A fascinating watch . . .
From: "Daniel Clark" <dclark(at)nwlink.com (dclark(at)nwlink.com)>
Great documentary on Bob Hoover !
| Quote: | Get a bowl of popcorn and a large enough jug to last
|
| Quote: | 80 minutes. Found this documentary to be rather
|
| Quote: | spell binding . . .
|
| Quote: | Un impeachable logic: George Carlin asked, "If black boxes
|
| Quote: | survive crashes, why don't they make the whole airplane
|
| Quote: | out of that stuff?"
|
________________________________ Message 6 _____________________________________
Time: 01:13:07 PM PST US
From: "Bill Settle" <billsettle(at)bellsouth.net (billsettle(at)bellsouth.net)>
Subject: RE: A fascinating watch . . .
Bob,
Thanks for sharing!
Bill Settle
From: owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com)
<owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com)> On Behalf Of Robert L.
Nuckolls, III
Sent: Wednesday, April 13, 2022 2:37 PM
Subject: A fascinating watch . . .
Get a bowl of popcorn and a large enough jug to last
80 minutes. Found this documentary to be rather
spell binding . . .
https://youtu.be/2ayA2UE-p8M
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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