Medium-Wave Station In The City’s Influence On The Surrounding Electromagnetic Environment

Along with the social economic development and urbanization continue to speed up, originally built in the city on the edge of the medium wave station surrounded by urban area. Medium wave transmitting equipment, due to launch power and principle of surrounding electromagnetic radiation level is higher, in the near region of the electromagnetic radiation intensity in the medium wave transmitting antenna may even exceed the national standard "controlling limita electromagnetic environment" (GB8702-2014).This paper, taking a medium-wave station in the western city of Inner Mongolia as the research sample, in its various equipment during normal operation of the transmitting antenna and medium wave surrounding environment protection target status of electromagnetic radiation measurement, setting the 330 survey points obtained 1650 data, according to the data analysis of medium wave station nearby regions, the trend of comprehensive field intensity in relation to the distance to the following conclusion:(1)Medium wave towers surrounding area field intensity increased with the increase of towers and distance attenuation rapidly,7 meter after the electric field intensity values are lower than the medium wave public exposure control limit is 40 V/m.(2)The ultra-short wave radio towers electric field intensity value with the increase of the distance as a whole also showed a trend of decline,500 meter within the scope of the electric field intensity value is lower than the public exposure control limit (12 V/m).(3)During normal operation, position transmitter inside part of the operating field intensity than the " controlling limita electromagnetic environment " (GB8702-2014) of public exposure control limit; Control the indoor part location field intensity is higher.(4)Now medium wave machine factory out the latest environmental protection target field intensity values between (0.8～1.1 V/m), is far less than the electromagnetic environment control limit rules limit.(5)According to the medium wave and ultrashort wave transmitting antenna field strength prediction of superposition theory, the medium wave station planning after the move, is 500 m from tower level outside electromagnetic radiation to meet environmental requirements, from the point of environment protection distance,500 meter distance protection, can meet the requirements.This study can provide the environmental protection department in the future for the supervision and management of the medium wave station to provide reliable data basis, based on the data at the same time to remove the public panic psychological influence on medium-wave station electromagnetic radiation.