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AeroElectric-List Digest: 6 Msgs - 04/13/22

 
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PostPosted: Fri Apr 15, 2022 5:55 am    Post subject: AeroElectric-List Digest: 6 Msgs - 04/13/22 Reply with quote

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

  ---

  Total Messages Posted Wed 04/13/22: 6

  ----------------------------------------------------------





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:


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:
>

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:
> on the bottom.

Quote:


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:


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:


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

Quote:
what purpose.

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

--

This email has been checked for viruses by Avast antivirus software.

https://www.avast.com/antivirus

________________________________ 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:


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:


Quote:
https://youtu.be/2ayA2UE-p8M

Quote:


Quote:


Quote:
Bob . . .

Quote:


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?"

Quote:




________________________________ 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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