大功率中波广播发射台引起电离层交叉调制效应的测量

Measurement of lonospheric Cross-Modulation Effect Caused by Two High-power MF Broadcast transmitting Stations

主要介绍我国首次进行的大功率中波发射机间电离层交叉调制效应的试验情况及测量结果,并根据大量测量数据及对电离层底部电场强度的计算,给出交叉调制度一反射点电场强度关系曲线,用以推算不同功率、不同发射天线类型产生的交叉调制干扰程度的量级和受干扰影响区域。

The test conditions and results of measurement of ionospheric cross-modulation between two high-power MF broadcast transmitters conducted inChina for the first time are described in this article. Curves indicating therelationship between the depth of cross-modulation (in%) and the calculatedfield strength at the point of reflection in the ionosphere are given on basisof the numerous measuring data and the calculation of the field strength. Inlight of these curves, the level of ionospheric cross-modulation and the scopeof interfernece of cross-modulation can be estimated for different values ofcarrier power and type of antennas.