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INVESTIGATION OF INFLUENCING TOWN CONDITIONS ON EFFICIENCY AND DIRECTIONAL PROPERTIES OF DECAMETRIC BAND RECEIVED AERIALS ARRANGED INSIDE BUILDINGS

By Alexander Viktorovich Korolenkov

Abstract

The serials applied by the listeners for decametric broadcasting reception inside urban buildings were investigated: rod and equal. The aim is to determine directional characteristics of these aerials and their efficiency at reception of the spatial waves in town and to develop firstly on base of these investigations the recommendations for design of the broadcasting lines for remoted territories with presence of the cities. The efficiency decrease of the investigated aerials owing to the field intensity weakening stipulated with different elements of the up-to-date town buildings has been investigated theoretically. The field intensity weakening dependence on the arrival angle in the shadow field formed by the town buildings has been shown. The weakening stipulated with the external reinforced concrete walls constituted 30 - 50 dB, but in shadow field - 20 - 40 dB. The experimental investigations were performed by an aeroplane flying around town on different heights with mounted transmitter and aerial of the vertical polarization. The signal reception was performed with the investigated aerials arranged inside the buildings arranged in the different town districts. The aerial radiation pattern form of the receiving aerials in town and also the statistical regulation of the spatial field intensity distribution in town (logariphmic-standard one with deviation 7,3 dB) have been determined, the median weakening of the field in town up to 11,3 dB has been determinedAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio

Topics: 09E - Power transmission, signal transmission, ELECTRONICS. RADIO ENGINEERING
Year: 1995
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Provided by: OpenGrey Repository
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