... HF alkylation impact 氢氟酸烷基化过程 HF radio communication 高频无线电通信 HF reject 高频抑制 ...
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hf adaptive radio communication signal 短波自适应通信信号
HF radio communication has a significant communication blind zone in the range of 200 kilometers usually. This disadvantage restricts its application in the near range tactical mobile communication.
短波无线电通信在200公里范围内通常存在着盲区，这一特点制约了其在近距机动通信中的应用。
The domestic research on third generation HF communication came late and most of the HF radio stations are based on second generation.
我国第三代短波通信的研究刚刚起步，国内的短波通信系统大多基于第二代短波通信标准。
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