For example, the codes of class 2 are the best full frequency hop codes up to now.

例如文中第2类码是目前已知的各方面综合性能最好的全频道跳频码。

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Fast frequency hopping system is the system whose hop rate is above one thousand per second.

快跳频系统指每秒频率跳变在一千次以上的跳频系统。

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When the frequency hop rate is more than tens of thousands, the design of frequency synthesizer is more complicated.

当跳频的速率达到每秒数以万计时，频率合成器的设计将要复杂得多。

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Recent discoveries, however, have such medgadgets being powered by photons, hip hop and now high-frequency radio waves.

ENGADGET: Stanford researchers make heart implant powered by radio waves, put batteries out of a job

Like a cordless phone looking for a clear channel, it can hop on to a less crowded frequency to send the next burst.

FORBES: Copper Hopper