Questions tagged [radio]

Radio equipment, including antennas, receivers, two-way radio systems, and more.

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2answers
2k views

Is it legal to use handheld radios to listen to airport frequencies in Australia?

I am a student pilot at ABX (YMAY) in Australia. It is a single engine aerodrome with three frequencies: 123.25; 125.80; and the ATIS frequency I live very close to the airport, directly under the ...
29
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5answers
17k views

Why is the quality of radio communication bad?

Why don't modern planes and ATC centers have good-quality audio for communication? For example in this video: Or basically any other example of pilot communication(...
10
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3answers
1k views

Why don't transponders have active and stand-by value like radios?

This answer explains how pilots when switching code on transponder should either carefully avoid temporarily squawking one of the emergency codes, or should temporarily put the transponder in stand-by....
4
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1answer
398 views

Can aviation HF radios receive while transmitting?

I was listening to Gander Radio on HF at 5616 kHz today and I've noticed that operator at Gander would often start transmitting reply before the airplane finished transmission, as if trying to ...
5
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1answer
2k views

Does radar altimeter work over the ocean?

I'm wondering if radio waves are reflected by the sea. If so then the usual radar altimeter would work. If not, then is there any other fallback besides barometric altimeter? According to the wiki ...
5
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2answers
1k views

As a passenger, can I use my handheld radio in commercial flights?

During flight from one country to another, can I use my hand held radio during flight to listen to ATC?
5
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2answers
8k views

How does the PTT button on the radio work?

I've always seen a button either built into the yoke or attached to the yoke with velcro on older aircraft. However, the other day my instructor used an older-looking headset that had a push to talk ...
6
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4answers
2k views

How do pilot and copilot operate and coordinate the radio?

How do the pilot and copilot of a large commercial jet operate the radio when talking to ATC? Is there a push-to-talk button, or some voice-triggered mechanism? Also, how do they coordinate it? How ...
12
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2answers
10k views

OBI, RMI, HSI… What combination do GA aircraft w/o glass typically have?

I'm learning about radionavigation, and all the various analog displays that can be used: Automatic Direction Finder (ADF) - Provides basic bearing information to practically any radio source the ...
5
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3answers
1k views

Exactly what kind of radios are prohibited for passengers inside an aircraft?

I know that passengers are asked to put their cell phones on flight mode. But some carriers allow use of WLAN on-board. So, what radios should passengers refrain from using? Also, if a person uses a ...
13
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2answers
4k views

What radio frequency bands are associated with the long wire antennas, why do some aircraft have them and others don't?

On many older aircraft, and in vintage aircraft photos, you can often see long wire antennas strung from some point on the top of the fuselage to the top front of the vertical fin. On newer aircraft, ...
1
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2answers
119 views

Do regulations permit an airliner be equipped with a radio transmitter which cannot be controlled by the crew? [duplicate]

In response to the case of MH370, an idea which has been floated is that of a device to transmit an aircraft's GPS position. Not specified is whether such a device would be operable by the flight crew....
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3answers
1k views

How would ATC try to establish contact with a VFR craft?

Example: I'm in a 172 tailed N1234A, on a pleasure hop between Hicks Field and Addison, circling around DFW International to the north, flying at 1500ft within DFW's Mode C veil under VFR (so I'm ...
9
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5answers
3k views

Can VOR indication be reliable if one of its antennas breaks?

What will be the reliability of the VOR indication inside the cockpit if one of the two outside antenna is broken ? Can we trust it to make a VOR approach? What will be the consequences assuming ...
8
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2answers
1k views

What is transmitting this radio signal @~110.515MHz and for what purpose?

I was scanning the local aviation radio frequencies, and came across an odd signal (listen to a recording here). It's at around 110.515MHz, and it seems strong within a 30 mile radius of Shropshire, ...
8
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2answers
2k views

Is it legal to use a home-made Airband radio receiver in the United States?

I work at a local small airport (very small, if we get more than about 10 or 15 airplanes taking off/landing it's a "busy day") and I mow the runways (we have multiple grass ones). Because of the ...
2
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1answer
314 views

How many VHF system can be in MEL for an A340?

How many VHF (Voice Communication) system can be in MEL for A340 aircraft? What are the guidelines to decide that and is it different for aircraft operating under FAR 121, 125 and 135?
2
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2answers
5k views

What is the range of an air traffic control tower's radio transmission? [duplicate]

What is the maximum distance the voice messages sent by the tower on a radio channel can be received by an aircraft?
15
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5answers
9k views

Can I fly with an airband receiver in the United States?

I'm flying with American Airlines on a cross-country flight soon and was thinking about bringing along my airband receiver/scanner since it'd be fun to listen to ATC. It looks like I'd be unable to ...
8
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3answers
3k views

What radios are airliners / large aircraft equipped with?

I know that pilots have to talk to the tower over the radio, and apparently you have to tune the radio to the right tower frequency. I've also heard that in an emergency, you're supposed to "squawk ...
6
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2answers
5k views

What requirements are there for radio systems in aircraft?

What are the requirements for radio systems in aircraft? For example, are there requirements about: Reception ability Transmit ability Transmit power This is primarily about voice communication ...
10
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3answers
7k views

How to record Intercom / ATC in a small aircraft like a Piper Archer?

For making videos it would be nice to have some more sound than the engine sound recorded by my GoPro. What ideas do you have to record the aircraft intercom? It won't be a problem for me to have two ...
15
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3answers
4k views

Why shouldn't you use HF radio while refueling?

FCOM limitations for many aircraft state: DO NOT USE HF RADIO WHILE REFUELING Why is this? I have heard from people that it's because most of the big airliners have a 'notch' antenna for HF; it's ...

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