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Additional resources for 06.Broadcasting
Allband’’ Yagi antennas include more than one driven element and several directors of different lengths and spacing in order to provide reception for all TV channels. Yagi antennas may be stacked in various configurations for increased gain and directivity. Since the characteristics of the Yagi-type antenna are inherently parasitic, they are strongly influenced by metallic structures to which the antenna is mounted. The best mounting is on a vertical steel pipe long enough to separate the antenna structure by several wavelengths from any other metallic objects.
The network operates at nominal 75 ⍀ throughout. No subscribers are connected directly to trunk or express 668 CABLE TELEVISION SYSTEMS cables. Depending on the length of the trunk cable, a series string, or cascade of trunk amplifiers, sometimes called trunk repeaters, is generally required to offset frequency-dependent cable losses, as well as various frequency-independent losses. In typical HFC networks, such series strings require fewer than five to ten repeaters, spaced about 500 m to 600 m.
A broader designation, cable TV or simply ‘‘cable,’’ embracing locally generated and other video and audio signals not received over the air from terrestrial broadcasting stations, has replaced the earlier terms in popular usage. Pioneers probed the mountains and hilltops for suitable receiving sites, by Jeep, airplane, or helicopter and on foot or horseback, packing a TV set, antenna, mast, and portable generator. They set up phased arrays of Yagi antennas to overcome cochannel interference. They built huge rhombics with sides 10 wavelengths (10) long, large curtain (bedspring) arrays, corner reflectors, and even a gigantic wire mesh very-high-frequency (VHF) horn.