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extremely extra high frequency; very high frequency (30 〜300 MHz的无线电频率。108〜118 MHz 部分,用于某些导航设备; 118〜136MHz 用于民用的空对地通话。这个波段的其他频率与空中交通管制无关。甚高频是几乎没有地面波元素的视线频率。VHF 作用距离随着高度增加。语音通信的最大距离可达185mile (300km )。甚高频波段的通信系统,在飞机和地面站之间提供高质量的通信。尽管是视线通信,用甚高频通过转发站和卫星链路进行远距离通信也是可能的) | |||
very-high frequency | |||
very high frequency | |||
very high frequency (30 〜300 兆赫) | |||
very high frequency | |||
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very high frequency | |||
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very-high frequency (30 兆赫 ~ 300 兆赫) | |||
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very high frequency | |||
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VHF band (30 兆赫 ~ 300 兆赫) | |||
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very high frequency | |||
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very high frequency | |||
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very high frequency |
甚高频 : 265 phrases in 21 subjects |