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ABSTRACT
Regular short wave C.W. transmissions from three stations, namely Bombay, Hyderabad and Madras, have been received at Waltair and their fading characteristics have been studied in relation to the overhead spead-F conditions. It was found that the fading rates were higher under spread-F conditions, compared to those under normal conditions. Allowing for the time shifts in the occurrence of similar peaks in the fading rate and spread-F index temporal variations, a systematic linear increase of the fading rate with spread-F index has been found. It was also observed that the C.W. transmissions in the E-W direction are more affected by spread-F conditions than the transmissions in the N-S direction. From amplitude probability distribution of the fading patterns, it was found that the steady to random component ratio was around 1·8 under spread-F conditions. These distributions under spread conditions were compared with those under normal conditions which are nearer to the Rayleigh type.