1.前言小型电视差转台在建台到常会遇到发射铁塔多高才合适的问题,有时还可听到这样一种说法:“铁塔越高,服务区就越大”。我们对此做过试验。试验条件是:铁塔立在45m高的山上,机房在塔旁,差转机发12频道,输出功率为10W;发射天线有1.3倍功率增益,其试验位置设在塔的5.5m、21m 1. Introduction Small-scale TV station in Taiwan often encountered towering towers are too tall to meet the appropriate issue, and sometimes heard such a statement: “The higher the tower, the greater the service area.” We have tried this. The test conditions are as follows: the tower stands on a hill with a height of 45m, and the engine room is near the tower, transmitting 12 channels to the generator with an output of 10W; the transmitting antenna has a power gain of 1.3 times, and its test position is set at 5.5m and 21m