Ultra high frequency

Decimeter microwaves whose wavelength is in the decimeter range, ie between 10 and dm 1 dm, which corresponds to a frequency band of 0.3 GHz to 3 GHz.

This frequency band is also referred to as a UHF band, the UHF stands for Ultra High Frequency.

Decimeter are, inter alia, used for terrestrial television broadcasting, mobile communications, in wireless devices and in radar equipment and in process applications such as microwave ovens.

The frequency ranges which are used for terrestrial television, are divided in the frequency bands of the UHF band -IV ( 470-582 MHz) (channels 21 to 34 ), and UHF-band V ( 582-862 MHz) (channels 35-69 ). In addition, the hyper band cable television lies with the special channels S21 to S41 in the decimeter between 300 MHz and 470 MHz.

For the channels of the UHF yagi antennas, reflector antennas, patch antennas, and can be used ( for example, the corner - antenna).

At a high transmission power, the quasi-optical sight between transmitter and receiver is considered as the limit of the range. The ranges of up to 70 km in normal conditions and up to 140 km with special effort ( at least four Yagi antennas from 2 m length) and a good location are certainly possible for the TV reception.

The other TV frequencies ( VHF Band I and III, middle and bottom special channels ) and FM radio in Volume II of the ultra-short wave, however, are associated, they are below the UHF band.

UHF is also used by many remote controls and for voice and data transmission ( radio services, RFID, telemetry, wireless microphones ).

The amateur radio service here has the 70 -centimeter band that get assigned to 23 -centimeter band and the 13 -centimeter band.

Wavelengths of about 12 cm ( 2.5 GHz) are assigned to private and industrial use: This working microwave ovens, wireless LAN and point - to-point data links. Here come to transmit and receive antennas and spiral antennas and pot ( on vehicles ) are used.