Quick Answer: Are ATC frequencies AM or FM?

It’s in AM. The VHF aero band extends from 108 to 135.975Mhz, while the UHF bands falls between 225 and 400Mhz. AM is used for both VHF/UHF traffic for two reasons. FM signals coming and going to an aircraft would be subject to the Doppler effect, wich can shift them off the established communications channels.

What frequency is ATC?

All ATC communications are between 118.0 and 137.0 MHz. If you think you’re given a frequency above or below those numbers, there is a mistake.

What type of radio does ATC use?

The most common form of communication in aviation, very high frequency (VHF) radio calls are what we use for around 95% of our communications with ATC. In simplified terms, the transmitting station sends a signal that travels in a straight line and is picked up by the receiving station.

Is VHF FM or AM?

VHF-FM Lo band: Frequency Modulation 30 MHz – 80 MHz, of which fire frequencies are between 30 MHz and 50 MHz. VHF-FM Hi band: Frequency Modulation 150 MHz – 174 MHz. This is the most widely used band by fire agencies. VHF-AM: Amplitude Modulation.

Which frequency is used in aircraft?

Spectrum Engineering & Policy – Radio Frequency Bands Supporting Aviation

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Frequency Band Name
118 – 137 MHz VHF Air / Ground Communications
138 – 150.8 & 162 – 174 MHz Fixed, Mobil
225 – 328.6 & 335.4 – 400 MHz UHF Air / Ground Communications (U.S. Military)
328.6 – 335.4 MHz ILS Glide Slope

What do you say at ATC?

Simply call on the frequency you are given, state your call sign and position, and the words “request flight following.” If the Center controller can work you, he’ll give you a transponder code and information on other radar-identified traffic around you.

Why do radio operators say Niner?

Pilots and air traffic controllers say niner instead of nine to distinguish it from other numbers. Radio transmissions may not be crystal clear, and with any disturbances on the frequency, nine could be easily confused with five, given they are one-syllable and rhyme.

What does ATC stand for?


Acronym Definition
ATC Air Traffic Control
ATC Average Total Cost
ATC Artist Trading Card
ATC Air Training Corps (United Kingdom and Australia)

Why is AM radio bad at night?

AM signals can be harder to hear at night than they are in the daytime. Each day, between sunset and sunrise, distant AM signals can reflect off the upper layers of the atmosphere and be reflected back to ground hundreds of miles away, causing interference to local stations.

Are police radios UHF or VHF?

Police radios operate in a 700/800 MHz UHF band. This gives them a considerable amount of range which is pretty good in urban areas.

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Can VHF talk to UHF?

VHF and UHF Walkie Talkies can’t talk to each other. The terms UHF and VHF refer to the “wavelength”. … That said, if a VHF wave and a UHF wave are transmitted over an area without obstructions, then the VHF wave would travel around twice as far. Since the VHF frequency waves are bigger, then the antenna must be bigger.

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