Slow frequency Hopping in GSM means that the frequency of radio timeslot is changing burst by burst.

全球移动通信系统中的慢跳频意味着无线时隙跳频正一阵一阵地改变。

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Their instruments detected very faint radio waves at a frequency of 3 kilohertz.

他们的仪器探测到了频率为3千赫的非常微弱的无线电波。

《柯林斯英汉双解大词典》

Regular repeating actions such as sound waves, light waves, or radio waves have a certain frequency, or number of waves per second.

有规律的重复活动如声波、光波、无线电波都有一个特定的频率，或者说是每秒的波动次数。

《柯林斯英汉双解大词典》

But there is a limited amount of radio frequency spectrum available.

VOA: special.2010.03.19

Other anti-counterfeit efforts include the use of radio frequency identification tags.

VOA: special.2010.03.01

AM radio can be sent over larger distances, but the quality of the sound is not as good as a later kind of radio signal processing, called frequency modulation.

VOA: special.2010.12.08

By changing the frequency of a radio transmission many times a second, causing it to leap around in an apparently random fashion, a radio signal could be made almost impossible to intercept.

ECONOMIST: Player-piano pioneer

The Australian research focused on the thermal effects or specific absorption rate (SAR) of radio frequency radiation - a measure of its actual effects on brain tissue, whereas the earlier study simply looked at electromagnetic radiation levels.

BBC: Hands-free mobiles given safety boost

Deployment of radio frequency identification (RFID) chips, after years of hype and more than a few false starts, gets going in earnest.

FORBES: Magazine Article