Questions tagged [radio-communications]

Radio is the primary way that pilots communicate with air traffic control and with other aircraft.

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19
votes
3answers
5k views

How is the ATC language structured?

Is the content of spoken communications used by air traffic control and pilots defined as part of a rigorous language definition? Such as a morphological or lexical foundational system, or is ...
26
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2answers
6k views

Does air traffic control identify a distress situation when an aircraft flies triangles in the sky?

Can you confirm whether this left-hand triangular pattern procedure can be used to report to ATC a distress situation? Is (or was) apparently used by US Navy (page I-7). Is mentioned in this UK ...
7
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4answers
1k views

What is the purpose of using 8.33 kHz instead of 25 kHz frequency spacing?

What is the purpose of using 8.33 kHz instead of 25 kHz frequency spacing?
5
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1answer
117 views

What is the 'Deconfliction Service'?

High Speed Flights 2.36 - When receiving an ATS surveillance service, certain ex-military aircraft types have been granted a CAA exemption from the Air Navigation Order requirement to fly at an ...
12
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3answers
9k views

How are squawk codes assigned?

How are the 4-digit squawk codes assigned to individual flights? This answer indicates that there should be a "correct" one. How does ATC know what is "correct" and what is "incorrect"?
9
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2answers
903 views

How can I find the location and coverage of aviation VHF transmitters?

In the USA, is there a way to find locations of VHF transmitters that are used for air traffic communication, and the frequencies they transmit/receive on? There are some places (Northern Bay Area, CA)...
29
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2answers
5k views

What does ATC do during “slow” times?

I know at larger airports, it's NEVER a slow time. But what about at smaller airports that are large enough to rate manned ATC, but things aren't always fast-paced, high-traffic like at JFK or DFW, ...
-2
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1answer
78 views

What are some alternate methods of communication with aircraft (specifically small drones)?

I've been thinking about his alot but I've yet to find an answer. Most of the time drones use radio, wi-fi, GPS and Bluetooth signals to communicate with their controllers but all of these methods ...
5
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4answers
2k views

An appropriate way to practice ATC communications

I'm a PPL trainee and I'm looking for a way to improve my radio communication. https://www.liveatc.net/ is a great way to practice but I can't fully understand the conversation between the unit and ...
3
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3answers
161 views

How do you write 'to', 'then', or 'via' in IFR clearances shorthand symbols?

Although there are NO restrictions about the usage of shorthand symbols, still it would be useful when I fly with another person together, so I studied those symbols and got some doubt points. If ...
5
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1answer
445 views

What terminologies are used when ATC instructs a pilot to stop or proceed with his transmission?

If some pilot forgets to release his mic button, distracting everyone on the frequency, what terminology can be used by an ATC to stop it? And if another pilot stop transmitting his message until the ...
2
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0answers
157 views

Is there a specific reason Delta Airlines is allowed to have a call sign that's also code word in the NATO phonetic alphabet?

This is a followup to Is there any specific reason why Delta Air Lines doesn't have its own callsign? I was... "helpfully" informed that, um, actually, Delta Airlines does have its own callsign, it's "...
26
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4answers
6k views

Is there any specific reason why Delta Air Lines doesn't have its own callsign?

Many airlines have their own callsigns for use over the radio. A British Airways plane is called "Speedbird", US Airways was "Cactus", etc. So why doesn't Delta Air Lines do the same? It would seem to ...
2
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1answer
152 views

Why are the VHF and UHF airbands directly adjacent to frequency bands used by vital radionavigation aids?

Of the three main frequency ranges used by aircraft for radio communications (HF, VHF, and UHF), two (VHF and UHF) have their aircraft-radio-communications frequencies clumped together into a ...
13
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1answer
2k views

What happens if a crew complies but does not read back ATC instructions?

For example, a commercial airliner is inbound and is in the traffic pattern; ATC instructs the aircraft to reduce speed to 160 knots, which the airliner does. ATC notice the aircraft has complied but ...
8
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2answers
243 views

Is a cIearance only valid once it's accepted?

I've read somewhere that "a clearance is not valid until read back correctly," but I can't remember where or find a specific rule saying that. I understand some clearances can be accepted with "Wilco"...
13
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3answers
800 views

Does a line up and wait instruction clear me to backtrack the runway?

I had an interesting occurrence at the start of a recent flying lesson, at an aerodrome with ATC service. We were holding at A and completed our power checks. We hadn't requested nor been offered an ...
0
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3answers
163 views

Can ADS-B used for voice communications?

Everyone knows the radio communications doesnt sound great altough they work perfectly. But can the brand new ADS-B communications be used for carrying audio signal? Would it be clearer? The ADS-B ...
3
votes
1answer
125 views

How could I match the surrounding traffics displayed with their radio communication

If I have a traffic display I could see the traffics in proximity of my aircraft and meanwhile I could listen to their voice communication. So how could I match the traffic shown in the display with ...
6
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3answers
2k views

How does the modulation of the transponder work?

The transponder works in PCM (pulse code modulation): how does it work in the transponder? I can find explanation of what PCM is, but not if the signal sent from the transponder antenna is digital or ...
2
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1answer
142 views

Why is VHF still used? [duplicate]

I have a rather easy(?) question. Why is VHF radio still the main communication method between the ATC and pilot? Is it because there is no better solution at the moment? Best regards
36
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5answers
9k views

What prevents someone from hijacking a radio frequency mid-air?

For someone who wants to stay anonymous and probably terrorize the skies, what protective measures do we have? Without even thinking too deep, I can imaging the following scenarios for someone who's ...
1
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4answers
796 views

What to look for when purchasing a headset

I'm currently a student pilot, and I'm starting at an aviation university this fall to major in commercial aviation. Needless to say, I will be flying a lot. I'm looking to upgrade to a nice headset ...
1
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2answers
2k views

Where do I find a complete Volmet frequencies list for Europe? [closed]

Is there any website or ,even better, book to buy to get such frequencies?
6
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1answer
425 views

What are ATC-side procedures to handle a jammed frequency?

A few days ago, I was flying into my base airport in the USA with a control tower, and something/someone was jamming the frequency with what the tower thought was a hot mic after I had established ...
2
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3answers
813 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 ...
7
votes
1answer
12k views

What connector standard is used for aviation headsets?

The typical aviation headset features two cords with connectors that at first glance are identical. One is a standard 1/4" (0.25 inch) stereo audio jack. What kind of connector is the slightly ...
9
votes
6answers
13k views

Is it possible to use normal headphones for passengers in a light aircraft?

I'm just finishing up my private license and am looking forward to taking some friends up in a Cessna 172. I've invested in a nice aviation headset for myself, but, as none of my friends are pilots, ...
2
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0answers
94 views

Why would it be logical to call clearance delivery prior to CTAF during an instrument approach?

I am quoting this directly from the FAA's Instrument Procedures Handbook publication. "The communication strip provided near the top of FAA approach charts gives flight crews the frequencies that ...
15
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2answers
2k views

Do transoceanic airliners monitor marine VHF emergency frequencies?

I know that modern jetliners often have a multitude of radio equipment on board, including VHF, HF, satellite, etc. From what I've read (such as here), it's customary for jetliners to monitor 121.5 ...
3
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1answer
201 views

Do aircraft really have text communication over FMC?

I saw a photography that is obviously Photoshopped that sparked my curiosity Does aircraft have text messages transmission? Can text messages or text strings be transported over the air like ...
36
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6answers
14k views

Why do we say certain things three times (e.g., “Mayday, Mayday, Mayday”), rather than two or four?

Repetition is a key characteristic of communication in the control tower, cockpit, and control room. Some phrases, like "Mayday" get repeated. The speaker says the same thing three times. We know ...
2
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2answers
429 views

What is the proper ICAO phraseology to activate a flight plan?

OK, so you have a flight plan filed (over internet, phone, company or however), go to the aircraft and get in the cockpit. So you call the controller and request IFR or VFR as appropriate. What is ...
12
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1answer
207 views

How do you communicate with a military drone operator over radio?

This article (and other similar ones) states: In remarks at the White House on Thursday, US President Donald Trump said the drone had flown to within 1,000 metres of the USS Boxer and had ignored "...
5
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2answers
1k views

How do aircraft making HF transmissions avoid stepping on other HF users?

HF radio (High Frequency; the portion of the radio spectrum extending from 3 to 30 megahertz (MHz),1 although only some of this slice is available for aeronautical use) is the backbone of long-range ...
5
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1answer
3k views

What are the reasons for the particular range of VHF and UHF frequencies?

Generally, VHF frequency range is 30~300MHz and UHF is 300~3,000MHz. (according to Wikipedia). However, in ATC, VHF frequency range is 117.975-137MHz and UHF is 225MHz-400MHz. Why is there a ...
0
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1answer
303 views

What causes harsh noise during TX/RX on VHF radio?

I am running some trial radio test on PAE VHF main radio and during TX from ATC there is harsh noise at the background even though TX is 5/5. Likewise for the incoming RX from aircrafts. So I swapped ...
1
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1answer
110 views

When should I request clearance to return to altitude, after leaving cruise altitude?

I can not understand the term”cruise” perfectly. I know I should request ATC clearance to return to cruise altitude, if I leave cruise altitude to out side of the block. Ex) Cleared cruise altitude ...
45
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9answers
158k views

What are the advantages of squawking 7700?

I was reading this question about how do pilots send distress signals in emergency scenarios, and that got me thinking... In voretaq7's answer, he states that there are three ways to send distress ...
5
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2answers
873 views

How unusual were MH370's final ATC exchanges?

There are 2 noteworthy occurrences in the ATC radio transcript within just minutes of a 3rd noteworthy, quite unprecedented occurrence in aviation history: At 01:07:55 MH370 unnecessarily reported ...
1
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2answers
153 views

How feasible digital radio communications would be? [closed]

Its been over 100 years since we first flew and we still use analog radio with parasites and "radio effect" which changes your sound. Why don't we ditch the old system and make a mandate a new law ...
0
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1answer
173 views

What kind of microphones does aviation use?

Do they use the dynamic ones or cheap ribbon ones? Also why are these microphones so small? I guess they dont use condensers. (I am yet to see an 3.5mm jack (which is used both on the C172 and the ...
32
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6answers
21k views

How would an airplane land if the on-board radio breaks down?

Is there a special protocol for a situation where the on-board radio communication equipment suddenly breaks down? Would the pilot be able to land on a busy towered airfield or would they be forced to ...
5
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4answers
4k views

Can normal PC headsets replace 'aviation' headsets?

Aviation headsets have Noise Reduction and a larger jack (1/4") than most PC headset counterparts (1/8"). But there are many excellent quality PC headsets with sound-proofing materials which eliminate ...
7
votes
4answers
498 views

Are ham radio contacts allowed from inside an airplane?

This question probably lies in the middle ground between Amateur Radio.SE and Aviation.SE. I have seen a couple of videos where ham radio contacts are made with people on board a commercial aircraft ...
8
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2answers
453 views

Is it legal to fly without a radio in Germany?

Most people in the aviation world know that it's legal to fly a Super Cub without a radio in the US. Is it legal in other parts of the world, specifically Germany? I stumbled across this section in a ...
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2answers
149 views

What are the Area Control Center (ACC) frequencies for Germany?

I'm looking for the frequencies of all Area Control Centers (ACC) in Germany. What are they, or where are they published?
5
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2answers
281 views

What is a metering frequency and why would an airport have it?

I just read a post from a pilot complaining about how he thought a metering frequency was useless. It has something to do with being on the ground at an airport. What is it, what purpose does it ...
6
votes
2answers
270 views

How do messages get from the destination airport to a pilot?

A captain waiting in her airliner for take-off at an airport might inform her passengers: We'll be waiting another ten minutes before we're able to take off, as traffic is very busy at [destination]...
11
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5answers
884 views

Is it possible for ATC to see who’s transmitting on the radio on their radar?

I don’t think ATC currently has the capability of seeing who’s actually transmitting on the frequency. If technology permits (probably by making a connection between the radios and the transponder), ...

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