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-   -   A321 Antenna (https://www.pprune.org/tech-log/623165-a321-antenna.html)

Altcrznav 3rd July 2019 19:31

A321 Antenna
 
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....d09d155b86.jpg

Exrigger 3rd July 2019 20:13

Possibly a Marker Beacon Antenna:

Marker Beacon Antenna Archives - Sensor Systems Inc., Aircraft Antenna

tubby linton 3rd July 2019 20:20

A very reputable source to the A320f says that it is the Tcas.

Altcrznav 3rd July 2019 20:22


Originally Posted by tubby linton (Post 10508926)
A very reputable source to the A320f says that it is the Tcas.

The round antenna is TCAS.

tubby linton 3rd July 2019 20:31

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

AerocatS2A 3rd July 2019 20:56


Originally Posted by Altcrznav (Post 10508931)


The round antenna is TCAS.

Why so certain the round one is TCAS?

Smithy02 4th July 2019 00:11

Our A320 do not have ADFs fitted but that looks like an ADF sense antenna to me.

S02

Altcrznav 4th July 2019 00:23


Originally Posted by Smithy02 (Post 10509063)
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 July 2019 00:25

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.

LookingForAJob 4th July 2019 00:44

A bit of Googling (and only a little bit) 'cos I'm bored suggests it's a MKR.

pineteam 4th July 2019 08:00

How old is this A321? It surely looks like a TCAS antenna.

sonicbum 4th July 2019 09:49

If it's not the TCAS then it must be the Marker. Can't think of anything else with that shape.

FlightDetent 4th July 2019 10:22

https://cimg7.ibsrv.net/gimg/pprune....7eea90f766.png

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

Station Zero 4th July 2019 11:45

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 July 2019 17:50

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

Altcrznav 5th July 2019 17:52

Here's a different install of the old antenna.


https://cimg5.ibsrv.net/gimg/pprune....d623385279.jpg

Steve Zissou 11th July 2019 09:42

Not the GPS aerial ...? :*:ugh:

Wodrick 11th July 2019 22:20

GPS = Satellites. Satellites above aircraft. therefore GPS antenna on top, simple.

Check Airman 11th July 2019 23:01


Originally Posted by Wodrick (Post 10516373)
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 July 2019 03:19

Just curious, will GBAS need a separate one?

Smythe 13th July 2019 03:30


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 July 2019 19:28

Thanks. The question mark is the Altcrznav's Cell antenna before de-installation. DMEs are more forward.


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