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13.2 Frequency Units

Frequencies are expressed in Hertz (Hz). One Hertz equals one cycle per second.
Radio frequencies are high and for convenience the following units may be used:

13.3 Radio Frequency Bands

13.3.1 Frequency Spectrum

The following table shows the division of radio frequencies into the various bands.

The bands used for radio communications are the VHF and the HF bands.

Frequencies Frequency Band Wavelength Facilities
VLF
3-30 kHz 100 km - 10 km
(Very Low Frequency) Very long range navigation
LF
30-300 kHz 10 km - 1km NDB, Decca, Loran -C
(Low Frequency)
MF
300-3,000 kHz 1 km - 100 meters NDB
(Medium Frequency)

HF
3 - 30 MHz 100 metres- HF R/T
(High Frequency)
10 meters

VHF
30 - 300 MHz (Very High 10 meters -1 VHF R/T, VDF,
meter VOR, ILS.
Frequency)
marker beacons,

UHF
300 - 3,000 ILS Glidepath, DME,
(Ultra High 1 meter -10 cm
MHz some Surveillance
Frequency)
Radar.

SHF
PAR, some Surveillance
3 - 30 Ghz (Super High 10 cm -1 cm Radar, Doppler Radar,
Frequency)
Radio Altimeter .AWR
EHF
30 - 300 GHz (Extremely High 1 cm -1 mm Airfield Surface
Movement Radar
Frequency)

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