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在无假负载的情况下,经常采用阻抗电压法测量中波发射机的输出功率。但当背景杂音特别大时,则无法利用阻抗电桥测出馈线阻抗,即无法测得功率因数。本文提出一种简单的方法,将馈线输入阻抗的电阻与电抗部分的测量转化为电压测量的方法,从而间接地测得功率因数,本文对这种方法的原理,测量中应注意的事项做了必要的论证。模拟屏耗法是中波发射机输出功率的另一种测量方法。本文还就水冷和蒸冷发射机采用模拟屏耗法的原理.估算公式及测量中应注意的问题分别做了扼要的叙述。两种方法在实践中证明是有效的,可以达到一定的测量准确度。
In the absence of false load cases, the impedance voltage method is often used to measure the output power of the mid-wave transmitter. But when the background noise is particularly large, you can not use the impedance bridge to measure the feeder impedance, that is unable to measure the power factor. In this paper, a simple method is proposed, which converts the resistance of input impedance and the reactance part into a voltage measurement method, so that the power factor can be measured indirectly. In this paper, the principle of this method and some precautions should be taken Necessary argument. Analog screen consumption method is another measure of the output power of a mid-wave transmitter. In this paper, we also use the principle of simulation screen dissipation method for water-cooled and steam-cooled transmitters, and give a concise description of the estimation formulas and the problems that should be noticed in the measurement. The two methods proved to be effective in practice and can reach a certain degree of measurement accuracy.