Analysis of Antenna Beam-tilt and Broadcast Coverage
Antenna beam tilt affects areas covered by strong signals. Improvements greater than 10dB are realized using greater beamtilts offered in end-fed arrays.
Download FileAnalysis of Antenna Climbing Equipment
Antenna climbing systems are compared. Dedicated, separate climbing ladders are found to have superior safety and reliability characteristics.
Download FileAnalysis of Antenna Null-fill and Broadcast Coverage
Antenna pattern characteristics of end-fed and center-fed arrays are discussed. End-fed arrays are found to have improved null-fill and coverage.
Download FileAnalysis of Dual-Channel Broadcast Antennas
The design concept is discussed for slotted UHF antennas that allows the combining of a high power NTSC channel with an adjacent DTV channel assignment using a single transmission line and antenna.
Download FileAnalysis and Measurement of RF System Reflections and DTV Transmission
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.
Download FileAnalysis of Pressurized Radome Enclosures
Enclosures are discussed for the protection of antenna equipment in extreme environments.
Download FileAnalysis of Smooth Patterns and Broadcast Coverage
Antenna pattern characteristics of side-lobe level and null-fill are compared. The application of smooth, null free patterns is discussed.
Download FileAntenna Contributions to Amplitude and Phase Variation Across a Broadcast Channel
Antenna amplitude and phase patterns, differential amplitude, differential phase, and group-delay are compared for end-fed and center-fed array configurations.
Download FileAntenna Pattern and Coverage Optimization
Antenna patterns of end-fed and center-fed antenna arrays are compared. Coverage improvements are produced by end-fed array elevation patterns.
Download FileArray Antenna Pattern Measurement Techniques
Antenna patterns are measured using two independent methods and compared. Excellent agreement between far-field measurement and measurements from anechoic chamber and nearfield techniques.
Download FileHigh Level IBOC Combining Methods for Single Input Antenna Systems
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.
Download FileSlotted Coaxial Arrays Provide Lightweight, Economical Antenna Alternatives to Panel Arrays
Antenna patterns and reliability of UHF slot array and panel array antennas are compared.
Download FileTransmission Line for Broadcast Applications
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.
Download FileTransmission System Design Considerations For Analog FM Facilities With 400 kHz Spaced Allocations
FM Broadcast facilities with reduced guard bands require special consideration to prevent interference.
Download FileWaveguide for TV Broadcast
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.
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