Abstract :
Summary form only given. A receive system, mounted in a survey vehicle with a telescopic mast, has been used to measure field strength and picture quality throughout the Winchester area. Particular studies have been made of: comparison of the two modulation schemes, FM and VSB-FM; bit-error-ratios for both modulation schemes; cross-polar discrimination; comparison between winter and summer; multi-path effects, using the swept-frequency source; and propagation just beyond the horizon, using four remote data-loggers. These measurements have been compared with the predictions of the IBA transmitter coverage software, which uses a 50 m terrain data base. A clutter data base has been added, with the same horizontal resolution, and various techniques have been assessed for using this information in the prediction software
Keywords :
database management systems; field strength measurement; frequency modulation; interference (signal); microwave measurement; radiowave propagation; television broadcasting; television reception; 12 GHz; FM; IBA transmitter coverage software; SHF; TV broadcasting; TV picture quality; VSB-FM; Winchester area; bit-error-ratios; clutter data base; cross-polar discrimination; field strength measurement; microwave frequencies; multi-path effects; propagation modelling; terrain data base;
