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我国各地生产的10kW脉宽调制发射机的杂散辐射相对于载波场强来说,一般为—60～—70dB。为改善这项指标,我们做了一些工作,并取得一定成果。我们在一部200kW脉宽机上实验,其天线主向上的杂散辐射达到—80dB。以后将此经验用于黑龙江广播设备制造厂生产的10kW脉宽机,使杂散辐射也达到小于—80dB的水平。例如黑龙江省某转播台10kW脉宽机,在距天线约700米处,实测杂散辐射为—87dB。
Stray radiation produced by 10kW pulse width modulated transmitters in various parts of our country is generally -60 ~ -70dB relative to the carrier field strength. To improve this indicator, we have done some work and achieved some results. We experimented on a 200kW pulse width machine with up to -80dB of stray radiation on the main antenna. After this experience for Heilongjiang radio equipment factory production of 10kW pulse width, so that stray radiation also reached less than -80dB level. For example, a relay station in Heilongjiang Province 10kW pulse width of about 700 meters away from the antenna, the measured spurious radiation was-87dB.