Questions tagged [antenna]

Questions about antennae, the typically-long-and-thin things used by aircraft to send and/or receive radio signals (for communication and/or navigation and/or other things as well).

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5
votes
1answer
144 views

Can you identify this antenna on a Cessna 172N?

Does anybody know what this antenna is used for? I suspect a glideslope antenna but I am not totally sure.
0
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0answers
81 views

Can you identify this ILS/VOR antenna?

I'm looking for an ILS/VOR cheap and lightweight antenna. I can see there are several models (p.e. aircraftspruce catalog) but the following one drew my attention: All I know is it's being used by a ...
2
votes
1answer
454 views

What is this “stick” on top of Cessna 152's wing, and how does it work? [duplicate]

What is this device? What is it for? Seems that some variants have only one, while some others have two. Added: As some have two, so what are they? The answers and comments have not explained which ...
1
vote
2answers
173 views

Why did this old Japan Nakajima J1N airplane use a Yagi rather than a parabolic antenna?

Picture source. As per my understanding, a Yagi antenna is a directional antenna with limited gain, which it broadcasts or receives the microwave signal to and from the front side. It can only ...
2
votes
1answer
81 views

How much extra drag does an external HF antenna incur?

As seen in the picture, some older planes have external HF antennas that run from the fuselage to the tail. Have any studies found the wire to be a significant source of drag or is the difference ...
4
votes
1answer
109 views

Is this a type of navigation aid?

I saw this contraption on the southeast corner of Eastern West Virginia Regional Airport, Martinsburg, WV (MRB). My first thought was this was some kind of NDB antenna but not sure.
0
votes
2answers
389 views

AWACS - what do these antennas do?

In a press release for a new Boeing "wingman" (BATS) drone being built in Australia, a closeup of this Australian AWACS flying in formation was provided. What would be some of the specific uses for ...
2
votes
3answers
762 views

What are the radio characteristics of communications between tower and aircraft?

I have a few questions on the types of antenna used for tower-aircraft comms. What type of antennas are used today for tower-aircraft comms? Are they directional or omni-directional? What's the ...
1
vote
1answer
189 views

How the Log Periodic Dipole Antenna of Localiser help in varying modulation depth?

Here Albert Helfrick speaks about 40% modulation depth for each tone in a localiser radio signal. However latest manuals of ILS manufacturers and google source speaks about 20% modulation depth, not ...
5
votes
1answer
2k views

Which antenna on an commercial airline airplane is used for the transponder (SSR)?

On the 767-200 image I see no SSR antenna, but since that TCAS uses the transponder I guess that are sharing the same antenna. Am I right ?]1