1.4GHz-Band Radio Interferences at Seoul Radio Astronomical Observatory

Details 1.4GHz-Band Radio Interferences at Seoul Radio Astronomical Observatory 1.4GHz-Band Radio Interferences at Seoul Radio Astronomical Observatory

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pkas...14...39k&link_type=abstract

Publications of the Korean Astronomical Society, vol. 14, no. 1, pp. 39-45

Astronomy and Astrophysics

Astronomy

Scientific paper

We have carried out measurements of 1.2-1.6GHz radio interferences around Seoul Radio Astronomy Observatory located in the campus of Seoul National University. We received interference signals using a pyramidal horn antenna and measured its power using a spectrum analyzer with 1 MHz resolution after ~ 60dB amplification. In order to check the spatial characteristics, we made observations at every 30 deg in azimuth at elevation of 30 deg and 60 deg. Also, in order to check the temporal characteristics, we repeated the all-sky observations five times at every six hours. The results may be summarized as follows: (1) There are strong (>= -20dBm) interferences between 1.2 and 1.4GHz. Particularly strong interferences are observed at 1.271 and 1.281GHz, which have maximum powers of -0.34dBm and -0.56dBm, respectively. (2) The characteristics of the interferences do not depend strongly on directions, although the interferences are in general weak at high elevation and in east-west direction. (3) The interferences appear for a very short (<= 0.01s) period of time, so that the average power is much smaller than the maximum power. Strong interferences with large (<= -49.0dBm) average power have been observed at 1.271, 1.281, 1.339, and 1.576GHz. At these frequencies, the interferences appear repeatedly with a period of <= 0.1s. By analyzing the observed power, we find that, for the strongest 1.271GHz interference, the average intensity is -171 dBW/m^2/Hz and that the maximum intensity is -122 dBW/m^2/Hz. If this interference is delivered to the detector without any shielding, then its power would be much greater than the rms noise of a typical line spectrum. Therefore, it is important to shield all the parts of receiver carefully from radio interferences. Also, without appropriate shielding, the sensitivity of a receiver could be limited by the interference.

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