Uhf Emergency Frequency. Note: The Chart details every UHF channels main use. 0 MHz

Note: The Chart details every UHF channels main use. 0 MHz for UHF. [12] As a matter of convention, the ITU divides the radio spectrum into 12 bands, each beginning at a wavelength which is a power of ten (10 n) metres, with corresponding frequency of 3 U - Unknown. 5 MHz is the civilian aircraft emergency frequency or International Air Distress frequency. 121. They are free to use. , (40/50) where 800mhz trunk tracking emergency services scanner. g. VHF radio waves propagate mainly by line-of-sight, so they are blocked by hills and mountains, although due to refraction they can travel somewhat beyond the visual horizon out to about 160 km (100 miles). between channels 15 and 16).

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