Polarization discrimination in v.h.f. reception

An account is given of measurements in the band 40¿200 Mc/s of the discrimination likely to be achievable between common-frequency transmissions by the use of orthogonal polarizations. It is shown that the discrimination is determined primarily by the topographical nature of the receiving site, that it is substantially independent of distance from the transmitter and of frequency in the band under consideration, and that the median value is about 18dB. The perturbing effects of pick-up on the feeder and of receiving aerial misalignment are discussed.