The advantages of strong anti-interference, random address selection make shortwave frequency-hopping (FH) communication have a wide application in the areas of military.

短波跳频通信具有较强的抗干扰能力和任意选址等优点而在军事通信领域得到了广泛的应用。

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Firstly, this paper presents an improved prediction method of maximum usable frequency (MUF) of skywave propagation based on the analysis of the current shortwave frequency prediction method.

在对当前短波频率预测方法进行分析的基础上，提出了一种天波传播最大可用频率预测的改进方法。

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The frequency prediction of skywave propagation in shortwave band is the precondition of performance prediction of skywave communication circuit.

短波天波传播频率预测是短波天波通信电路性能预测的前提。

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At the time, prosecutors allege, Mrs Heidrun was sitting in her study in front of a wireless transmitter that was receiving encoded messages on a shortwave frequency and was hooked up by cable to a computer, reports the German news website Spiegel Online.

BBC: Russia 'spies' go on trial in Germany

Clandestine agents in the United States monitoring the frequency on shortwave radio could decode the messages using a decryption program provided by the CuIS. Such methods were employed by defendants previously convicted of espionage on behalf of Cuba.

CENTERFORSECURITYPOLICY: Cuban Intelligence Operations in the US