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针对通信电台易受电磁干扰的问题,实验用正弦波作为干扰信号对正常工作的某型号通信电台进行带内电磁辐射的效应研究。根据GJB中对电台受干扰等级划分的相关规定,确定各种干扰程度的干扰等级。实验中通过改变各种影响因素,测试各种条件下电台干扰门限值。实验结果表明:电台受到带内干扰时,干扰信号频率与电台工作频差为15kHz以内,被试电台干扰门限值很小,且变化很小;当频差超过15kHz时,干扰门限值随着频差的增大急剧增大,干扰频率与电台工作频率越接近,电台受到的干扰随场强的变化越敏感。并且,电台的功率对电台带内干扰的门限值也有一定影响。
Aiming at the problem that the communication station is susceptible to electromagnetic interference, the experimental study of the effect of in-band electromagnetic radiation on a normal communication station using the sine wave as the interference signal is carried out. According to GJB radio interference level by the relevant provisions of the division to determine the level of interference of various levels of interference. Experiment by changing a variety of influencing factors, test radio interference threshold under various conditions. The experimental results show that when the radio is in-band interference, the frequency difference between the interference signal and the radio is within 15kHz, and the interference threshold of the radio station under test is small with little change. When the frequency difference exceeds 15kHz, the interference threshold The increase of the frequency difference rapidly increases. The closer the interference frequency is to the working frequency of the radio station, the more interference the radio station receives with the change of the field strength. Also, the power of the radio station has a certain influence on the threshold of interference in the radio band.