Abstract
In this paper, results on attenuation measurements at 13 GHz under rainy conditions over another microwave link propagation path (Panihati-Barackpore) located over Kolkata have been presented. The link suffers large attenuation due to heavy rain. The communication link belongs to an operational agency. The microwave amplitude variation was monitored and rain rate measurements were made on twenty tour-hour basis by a fast response rain gauge in the monsoon months during 2005. The observed microwave radio signal was characterized with a steady signal. level similar to -42 to -43 dBm with fade depth similar to 1 to 2 dB under non-precipitation condition. The results on attenuation have been studied in the light of simultaneous rain rate observations. The results on attenuation of radio wave under rainy condition are useful to design and installation of future communication links both for terrestrial and earth space paths in the regions in India where we have rain characteristics similar to Indian eastern coastal station. The probability distribution of attenuation and rain rates have been deduced from measured observations.