single side band high frequency
... side frequency level difference 载频旁频防卫度 upper side frequency 上边频 single side band high frequency 单边带高频 ...
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现在海上通信系统主要有卫星通信、单边带、甚高频(VHF)。
Now maritime communications systems primarily include satellite communications, single side band, VHF (VHF).
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