VHF airband

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VHF-AM aircraft band, worldwide allocation 108-137 MHz, divided into two subbands:

108.0 MHz - 117.95 MHz - aeronautical navigation only - VOR, VORTAC, localizers (50 kHz channel spacing) 117.975 MHz - 136.975 MHz - aeronautical voice and data communication, AM (25 kHz / 8.33 kHz channel spacing)

Emergency frequency 121.5 MHz is often known as GUARD CHANNEL.

8.33 kHz channel spacing is used in Europe and in select other locations, most of the world uses 25 kHz spacing for a total of 760 channels. VDL (VHF data link) systems such as ACARS (aircraft communications addressing and reporting system) use select frequencies in the VHF airband, including 131.550 MHz and 136.975 MHz (in the United States).

Military aircraft retain the capability to transmit and receive on the VHF-AM aircraft band, with US military aircraft radios covering up to 150 MHz in AM mode. Military aircraft also make extensive use of the UHF-AM aircraft band 225-400 MHz.

Icom IC-A210E VHF-AM airband transceiver, designed for installation in aircraft, this version of the IC-A210 supports the 8.33 kHz narrowband channel spacing required in Europe. Frequency coverage is 118.000 MHz to 136.975 MHz in 25 kHz or 8.33 kHz steps with 6 watts AM carrier power.

Selected VHF aircraft frequencies

Frequency Purpose/Use
121.500 MHz Emergency Frequency known as Guard, see also 243.0 MHz - UHF Guard
122.900 MHz Common SAR (Search and Rescue) aircraft frequency)
123.100 MHz Common SAR (Search and Rescue) aircraft frequency)
123.450 MHz Unofficial air-to-air pilot chit-chat frequency
123.475 MHz Unofficial air-to-air pilot chit-chat frequency



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