Influence of obstacles on VHF TV signal propagation

Propagation measurements are conducted over 13 paths mostly in Western India. All the paths are chosen in such a way that they constitute single knife edge diffraction propagation paths. The fieldstrength data has been collected utilising Bombay, Poona and Srinagar TV transmissions. Out of the 13 paths chosen in this study 5 fall in the region around Bombay transmitter, 6 around Poona and 2 around Srinagar region. Both Bombay and Srinagar transmitters operate on channel 4 (61-68 MHz) and kPune operates on channel 5 (174-181 MHz). The e.i.r.p. of Bombay, Poona and Srinagar transmitters are 56 kw, 7.2 kw and 50 kw respectively. The observed fieldstrength values are converted into path loss values and compared with those obtained from different prediction methods