VHF/ˌviː eɪtʃ ˈef/noun[uncountableU]technical (very high frequency)radio waves that move very quickly and produce good sound quality〔无线电的〕甚高频 时代网英语在线翻译词典收录了323754条英语词汇在线翻译词条,基本涵盖了全部常用英语词汇的中英文双语翻译及用法,是英语学习的有利工具。
Furthermore, such sounds as those of turbines for dental treatment and railways sometimes have very high frequency. Therefore, we are exposed to many high-frequency sound waves in our daily lives.Mari UedaT. G. LeightonHideyuki HasegawaMasaaki Hiroe...
This is our database of identified RF signals in the frequency range 30 MHz - 300 MHz, which is the Very High Frequency band.
While Very High Frequency (VHF) communications offers plenty of positives: such as sound quality, smaller and low cost antennas, and is less subject to atmospheric interference. Its one large drawback is its relatively short range. The range of VHF radios is dependent on many factors, the most...
It is the energy level of an electromagnetic wave that causes it to become ionizing, not the number of waves that occur. Short-wavelength (high frequency UV [ultra violet], X-rays, gamma rays) radiation is ionizing while low-frequency radiation is not. Examples of ionizing radiation include ...
Ultra-high frequency waves propagate in the form of a ground-level spatial wave. In practice, at most a quasi-horizontal range of about 30 national miles (Nm) can be achieved. It should be emphasized that in the maritime radio channel the terrain does not affect wave propagation; however, ...