. The Bell System technical journal . Fig. 5—General view of antennas and pole mounted radioequipment at Green Harbor terminal. 540 BELL SYSTEM TECHNICAL JOURNAL mounted on a single wooden pole about ninety feet high. Horizontalexciter and reflector elements are supported on standard pairs of half-wave exciter elements, each comprising two half-wave conductors, are spaced one-half wave-length apart in a vertical. Fig. 6—Open view of ultra-short-wave transmitter. plane on one side of the pole. Four pairs of half-wave reflector ele-ments are similarly arranged on the opposite sid
. The Bell System technical journal . Fig. 5—General view of antennas and pole mounted radioequipment at Green Harbor terminal. 540 BELL SYSTEM TECHNICAL JOURNAL mounted on a single wooden pole about ninety feet high. Horizontalexciter and reflector elements are supported on standard pairs of half-wave exciter elements, each comprising two half-wave conductors, are spaced one-half wave-length apart in a vertical. Fig. 6—Open view of ultra-short-wave transmitter. plane on one side of the pole. Four pairs of half-wave reflector ele-ments are similarly arranged on the opposite side of the pole. Thespacing between exciters and reflectors is one-quarter antennas when mounted as shown in Fig. 5, give a gain, measured ULTRA-SHORT-WAVE RADIO TELEPHONE SYSTEM 541 at the other end of the circuit, of 12 db over a simple half-wave elementwith the same power input, at the same mean height. This type ofantenna was used as it gave the highest gain and directivity whichcould be conveniently mounted on a single pole. High directivity wasdesirable not only as a means of increasing the received signal but alsoto exclude automobile ignition and other noises originating near thereceiving stations. The transmitters and receivers are mounted on thepoles with their respective antennas. Daily observations of the circuit loss have not shown variationsgreater than ± 4 db from the normal value. Noise
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
