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Altcrznav
3rd Jul 2019, 20:31
Any thoughts as to what this antenna is for? And no, the TCAS one is the circular one to the aft.
https://cimg8.ibsrv.net/gimg/pprune.org-vbulletin/1500x2000/img_5645_7f9ca8de404fb1e3b813378c80a746d09d155b86.jpg

Exrigger
3rd Jul 2019, 21:13
Possibly a Marker Beacon Antenna:

Marker Beacon Antenna Archives - Sensor Systems Inc., Aircraft Antenna (http://www.sensorantennas.com/products/marker-beacon/)

tubby linton
3rd Jul 2019, 21:20
A very reputable source to the A320f says that it is the Tcas.

Altcrznav
3rd Jul 2019, 21:22
A very reputable source to the A320f says that it is the Tcas.

The round antenna is TCAS.

tubby linton
3rd Jul 2019, 21:31
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 (http://www.sensorantennas.com/products/tcas/)

AerocatS2A
3rd Jul 2019, 21:56
The round antenna is TCAS.
Why so certain the round one is TCAS?

Smithy02
4th Jul 2019, 01:11
Our A320 do not have ADFs fitted but that looks like an ADF sense antenna to me.

S02

Altcrznav
4th Jul 2019, 01:23
Our A320 do not have ADFs fitted but that looks like an ADF sense antenna to me.

S02

ADF antennas are on top.

Altcrznav
4th Jul 2019, 01:25
Iím thinking it is a plug for the old TCAS I antenna. When aircraft was upgraded to TCAS II, the ACSS round antenna was installed.

LookingForAJob
4th Jul 2019, 01:44
A bit of Googling (and only a little bit) 'cos I'm bored suggests it's a MKR.

pineteam
4th Jul 2019, 09:00
How old is this A321? It surely looks like a TCAS antenna.

sonicbum
4th Jul 2019, 10:49
If it's not the TCAS then it must be the Marker. Can't think of anything else with that shape.

FlightDetent
4th Jul 2019, 11:22
https://cimg7.ibsrv.net/gimg/pprune.org-vbulletin/640x334/antennae_46b29fd70ba7c18e981e19a124b9e07eea90f766.png

The Chemtrails Report Interchange Beam is not displayed for logical reasons, but the location varies for that one anyway.

Station Zero
4th Jul 2019, 12:45
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.

Altcrznav
5th Jul 2019, 18:50
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 (http://concourse.gogoair.com/gogo-atg-4-work/)

Altcrznav
5th Jul 2019, 18:52
Here's a different install of the old antenna.


https://cimg5.ibsrv.net/gimg/pprune.org-vbulletin/2000x1504/img_5649_2_5f53c36ea5283c399893dba1da1effd623385279.jpg

Steve Zissou
11th Jul 2019, 10:42
Not the GPS aerial ...? :*:ugh:

Wodrick
11th Jul 2019, 23:20
GPS = Satellites. Satellites above aircraft. therefore GPS antenna on top, simple.

Check Airman
12th Jul 2019, 00:01
GPS = Satellites. Satellites above aircraft. therefore GPS antenna on top, simple.
The GPS antenna under the plane is for navigation in the southern hemisphere :}

FlightDetent
12th Jul 2019, 04:19
Just curious, will GBAS need a separate one?

Smythe
13th Jul 2019, 04:30
Just curious, will GBAS need a separate one?

No, the GPS/GBAS antennae are the same..GBAS broadcasts a correction factor that the antennae picks up. The MMR separates and applies the correction factor.

The question mark is likely one of the DME ant

FlightDetent
13th Jul 2019, 20:28
Thanks. The question mark is the Altcrznav's Cell antenna before de-installation. DMEs are more forward.