헤르츠(Hertz, 기호: Hz, 문화어: 헤르쯔)는 SI 단위계의 주파수 단위이다. 이 이름은 전자기학 분야에서 큰 업적을 남긴 독일 물리학자 하인리히 루돌프 헤르츠(Heinrich Rudolf Hertz)를 기리기 위한 것이다.. 1 Hz는 SI 기본 단위로 표현하면 1 s 이다. 1 Hz는 “1초에 한 번”을 의미한다.

High-speed multimedia radio (HSMM) is the implementation of high-speed wireless TCP/IP data networks over amateur radio frequency allocations using commercial off-the-shelf (COTS) hardware such as 802.11 Wi-Fi access points.This is possible because the 802.11 unlicensed frequency bands partially overlap with amateur radio bands and ISM bands in many countries.

The ISM radio bands are portions of the radio spectrum reserved internationally for industrial, scientific and medical (ISM) purposes, excluding applications in telecommunications. Examples of applications for the use of radio frequency (RF) energy in these bands include radio-frequency process heating, microwave ovens, and medical diathermy machines. The powerful emissions …

Extremely high frequency (EHF) is the International Telecommunication Union (ITU) designation for the band of radio frequencies in the electromagnetic spectrum from 30 to 300 gigahertz (GHz). It lies between the super high frequency band and the far infrared band, the lower part of which is the terahertz band. Radio waves in this band have wavelengths from ten to one …

Nexus 7 is a series of Android-based mini tablet computers co-developed by Google, and may refer to: . Nexus 7 (2012), the first generation Nexus 7 (2013), the second generation

Le hertz (symbole : Hz) est l’unité dérivée de fréquence du Système international (SI). Un hertz est la mesure de la fréquence de répétition d'un événement qui se répète une fois par seconde (s-1 ou 1 ⁄ s).. Définition. Le hertz, de symbole Hz (du nom physicien Heinrich Hertz), est l'unité de mesure de la fréquence.Elle est reliée à la vitesse (v) et à la longueur d'onde ...