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Broadband Offers: Microwave Relay. The development of radar i World War II led to widespread use of micro-ave technology after the war. In particular, it as found that microwave frequencies ranging om about 1 to 10 GHz were suitable for trans-ission of broadband offers signals (such as those used television) for which no room was available in ic heavily used lower frequency bands. Broad-ind signals enable many types of signals to be irried simultaneously over the same path.7. Summer Courses for Students and Teachers Stockholm Univer sity offers 3-weeks' lecture courses (May and late August) on "Sweden oi Today." Lund University offers a 2-weeks' course (early September) on some phase of the social sciences.
Overland Microwave Relay. A broadband offers microwave repeater system basically consists of two terminal stations and a number of repeater stations. The latter are placed at intervals of 20 to 30 miles (32 to 48 km), depending on the hilliness of the terrain. The microwave repeater system uses high-gain horn or parabolic antennas and operates in the frequency band from 2 to 6 GHz. The repeater system, which handles up to 2,400 voice channels or four TV channels, serves in transcontinental telephone networks and for relaying television programs. |
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