Today's Message Index:
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1. 08:45 AM - Re: Transponder antenna ground plane (Robert L. Nuckolls, III)
2. 11:16 AM - Re: Transponder antenna ground plane (Eric Page)
3. 03:34 PM - Re: Transponder antenna ground plane (user9253)
4. 04:59 PM - Re: Transponder antenna ground plane (Eric Page)
5. 07:42 PM - Re: Transponder antenna ground plane (user9253)
Message 1
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| Subject: | Transponder antenna ground plane |
At 01:57 PM 4/11/2022, you wrote:
>Forgot to ask ' should the ground plane be
>=93grounded=94 to the fuselage as some suggest,
>should it be isolated from the fuselage, or does it make any difference?
>
>The ground plane probably should be grounded to the fuselage for lightning
>protection. But I don't think it matters for performance.
>
>--------
>Joe Gores
Agreed . . . and yeah, making the ground plane from
a hexagon or octagon cut our on a shear makes good
sense labor wise as opposed to cutting out a circle.
I was fixated on demonstrable performance as opposed to
practical convenience!
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 2
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| Subject: | Re: Transponder antenna ground plane |
I put transponder and ADS-B antennas inside the wings of my Kitfox. The ground
planes were made from a piece of very thin galvanized steel flashing material
that I sourced from Home Depot. I drew circles on the material in the required
sizes, rough-cut the parts with hand shears, then shaped them to final size
in a couple of minutes with a disc sander. The center hole was made with a step
drill, then the parts were coated with zinc chromate primer. I removed primer
from a small area around the center holes to ensure good electrical contact
to the antenna. I think my total investment in the parts was about $4 and
one hour of labor. A couple of varnished wood sticks and some structural epoxy
mounted them securely inside the wings, well away from the spar tubes.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=506541#506541
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| Subject: | Re: Transponder antenna ground plane |
Nice work Eric. Is the antenna on the bottom or top of the ground plane?
Does it matter?
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=506542#506542
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| Subject: | Re: Transponder antenna ground plane |
user9253 wrote:
> Is the antenna on the bottom or top of the ground plane?
> Does it matter?
In flight, the radiating elements (pointing up in the photo) will point down toward
the ground, and the BNC connector will face up. Not sure about your second
question, but I've only ever seen transponder antennas on the bottom of airplanes,
pointing down.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=506543#506543
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| Subject: | Re: Transponder antenna ground plane |
Next year Canada is going to require aircraft flying in Class A & B airspace to
be able to send transponder signals to satellites. This requirement can be met
either through antenna diversity (the use of a top and bottom antenna) or with
a single antenna that is capable of transmitting both towards the ground and
up towards satellites.
I have never seen transponder antennas on top of airplanes either. But chances
are that an antenna on top would work just as well as one on the bottom.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=506544#506544
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