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Title: Radio Noise Field Strength Measurements at VHF
Authors: Ghosh, B B
Saksena, R C
Issue Date: Apr-1980
Publisher: NISCAIR-CSIR, India
Abstract: Ambient radio noise field strengths have been measured for 95 MHz during the year 1977. Special low noise RF amplifiers have been designed and fabricated to increase the gain of an available high-frequency field intensity meter. It has been found that the ambient radio noise field strength at Delhi is less than 0.1 µV/m for 1 kHz bandwidth at this frequency Summer values were found to be somewhat higher than spring and autumn values, while winter values were found to be the lowest. However, for about 3% of total observations, this noise field strength increased to 1 µV/m or more. The periods of increased field strength extend from a few minutes to a few hours. For some of them, local thunderstorm in the vicinity could be identified as the cause, while others may be due to propagation via tropospheric ducting or abnormal ionospheric paths.
Page(s): 44-46
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.09(2) [April 1980]

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