Combining separate analog and HD Radio FM transmitters into a single antenna allows broadcasters to use existing equipment including transmitters, transmission line, and antennas; however, the options for accomplishing this are limited. A new method of high level analog/FM HD combining is discussed and compared to the other traditional methods.
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(Type: Whitepaper; Publication Number: 20121001001_BEN; Revision: 01; Updated: ;Language Code: EN;)
Enclosures are discussed for the protection of antenna equipment in extreme environments.
(Type: Whitepaper; Publication Number: 20101122059_AEN; Revision: 01;Language Code: EN;)
Antenna amplitude and phase patterns, differential amplitude, differential phase, and group-delay are compared for end-fed and center-fed array configurations.
(Type: Whitepaper; Publication Number: 20101122060_AEN; Revision: 01;Language Code: EN;)
Antenna patterns are measured using two independent methods and compared. Excellent agreement between far-field measurement and measurements from anechoic chamber and nearfield techniques.
(Type: Whitepaper; Publication Number: 20101122061_AEN; Revision: 01;Language Code: EN;)
Antenna beam tilt affects areas covered by strong signals. Improvements greater than 10dB are realized using greater beamtilts offered in end-fed arrays.
(Type: Whitepaper; Publication Number: 20101122062_AEN; Revision: 01;Language Code: EN;)
Properties of circular waveguide are discussed with application to UHF TV broadcast systems. Mode filtering pins are introduced to eliminate cross-polar and higher order modes.
(Type: Whitepaper; Publication Number: 20101122063_AEN; Revision: 01;Language Code: EN;)
Antenna patterns and reliability of UHF slot array and panel array antennas are compared.
(Type: Whitepaper; Publication Number: 20101122064_AEN; Revision: 01;Language Code: EN;)
Terrestrial digital television (DTV) broadcast employs complex transmission facilities composed of filters, diplexers, transmission line components, and antennas. The reflections introduced by these components are minimized by broadband design methods, and the nature of the total reflection as these components are combined into a system is developed. The radio frequency (RF) transmission line, immitance, and network parameters used to characterize these systems (i.e., voltage standing wave ratio or VSWR) are related to key DTV performance parameters.
(Type: Whitepaper; Publication Number: 20101122065_AEN; Revision: 01;Language Code: EN;)
The major design criteria for standard broadcast transmission lines and their correlation to published specifications are detailed. Technical performance and applications for DTV are outlined.
(Type: Whitepaper; Publication Number: 20101122066_AEN; Revision: 01;Language Code: EN;)
Antenna climbing systems are compared. Dedicated, separate climbing ladders are found to have superior safety and reliability characteristics.
(Type: Whitepaper; Publication Number: 20101122067_AEN; Revision: 01;Language Code: EN;)