MEASUREMENT OF THE REQUIRED CROSS-POLAR PROTECTION RATIO IN G-PAL TV FM SATELLITE TRANSMISSIONS PLANNING

A measurement campaign using live TV broadcast satellite signals and r eceiving commercial equipment has been carried out to study the requir ed cross-polar protection ratio at the receiving antenna in satellite transmission planning. This experiment provides useful and realistic c onclusions for the optimum spectrum allocation of TV channels in broad casting satellite systems, as for example, the frequency offset requir ed between cross-polar channels depending on the cross-polar rejection at the receiving antenna, for a certain grade of video signal impairm ent due to the cross-polar channel interference effects, and taken als o into account the noise contribution on the signal.