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millimetres are used.

9.2 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:

9.3 RADIO FREQUENCY BANDS

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 metres NDB
(Medium Frequency)

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

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

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

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