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A321 Antenna

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Old 3rd Jul 2019, 19:31
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A321 Antenna
Any thoughts as to what this antenna is for? And no, the TCAS one is the circular one to the aft.
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Old 3rd Jul 2019, 20:13
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Possibly a Marker Beacon Antenna:

Marker Beacon Antenna Archives - Sensor Systems Inc., Aircraft Antenna
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Old 3rd Jul 2019, 20:20
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A very reputable source to the A320f says that it is the Tcas.
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Old 3rd Jul 2019, 20:22
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Originally Posted by tubby linton
A very reputable source to the A320f says that it is the Tcas.
The round antenna is TCAS.
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Old 3rd Jul 2019, 20:31
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I think the round one is the gps and the flat one tcas. There are lots of images here.
TCAS Antenna Archives - Sensor Systems Inc., Aircraft Antenna
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Old 3rd Jul 2019, 20:56
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Originally Posted by Altcrznav


The round antenna is TCAS.
Why so certain the round one is TCAS?
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Old 4th Jul 2019, 00:11
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Our A320 do not have ADFs fitted but that looks like an ADF sense antenna to me.

S02
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Old 4th Jul 2019, 00:23
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Originally Posted by Smithy02
Our A320 do not have ADFs fitted but that looks like an ADF sense antenna to me.

S02
ADF antennas are on top.
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Old 4th Jul 2019, 00:25
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I’m thinking it is a plug for the old TCAS I antenna. When aircraft was upgraded to TCAS II, the ACSS round antenna was installed.
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Old 4th Jul 2019, 00:44
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A bit of Googling (and only a little bit) 'cos I'm bored suggests it's a MKR.
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Old 4th Jul 2019, 08:00
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How old is this A321? It surely looks like a TCAS antenna.
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Old 4th Jul 2019, 09:49
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If it's not the TCAS then it must be the Marker. Can't think of anything else with that shape.
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Old 4th Jul 2019, 10:22
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The Chemtrails Report Interchange Beam is not displayed for logical reasons, but the location varies for that one anyway.
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Old 4th Jul 2019, 11:45
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Round one behind is TCAS, not likely to be ATC or DME as they are the small yellow ones.

My guess some kind of air to ground coms, possibly cellular or some kind of gatelink. Not standard as there is a skin doubler externally for it.
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Old 5th Jul 2019, 17:50
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Solved

It is not an antenna but a cover plate for the old ATG-4 antenna used for our terrestrial-based internet. We're completely switched over to satellite so, obviously, these antennas were removed.

Gogo ATG-4 - what is it, and how does it work? - Gogo Concourse Blog
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Old 5th Jul 2019, 17:52
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Here's a different install of the old antenna.


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Old 11th Jul 2019, 09:42
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Not the GPS aerial ...?
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Old 11th Jul 2019, 22:20
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GPS = Satellites. Satellites above aircraft. therefore GPS antenna on top, simple.
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Old 11th Jul 2019, 23:01
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Originally Posted by Wodrick
GPS = Satellites. Satellites above aircraft. therefore GPS antenna on top, simple.
The GPS antenna under the plane is for navigation in the southern hemisphere
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Old 12th Jul 2019, 03:19
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Just curious, will GBAS need a separate one?
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