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贵刊今年第4期19页刊登的《自制室外转动天线》一文中,所自制的转动天线,它的底座是三根支架,立在地上可能下沉,使天线不能平行。就我国的民房来说,大多数都不是平顶房,这就给架设带来困难。而且还不能将天线线杆立得太高,远离电视台的地区或山区难于使用。笔者根据以上的不足,给予了改进,改进方法是:将原文中图1所示的三根支架去掉,使套筒承托板接触地面并固定好。底盘大小据天线线杆的高度而定。为了立天线线杆时方便,应做一个U字形铁板支架(见图),其厚度为5～7 mm,铁板下方焊接一个
In your article “Making an Outdoor Rotating Antenna” published on page 19 of this issue 4 of this issue, you can make a self-made rotating antenna whose base is three brackets and may stand on the ground so that the antennas can not be parallel. Most of the houses in our country are not flat-roofed, which brings difficulties to erection. But also can not stand the antenna pole too high, far from the TV station area or mountain hard to use. Based on the above shortcomings, the author gave an improvement. The improved method is as follows: Remove the three brackets shown in Figure 1 from the original, so that the sleeve supporting plate contacts the ground and is fixed. The chassis size depends on the height of the antenna mast. In order to establish the antenna pole convenient, should do a U-shaped iron plate bracket (see photo), the thickness of 5 ~ 7 mm, welding a