vhf wikipedia - EAS
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See all on Wikipediahttps://en.wikipedia.org/wiki/Very_high_frequencyVery high frequency (VHF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) from 30 to 300 megahertz (MHz), with corresponding wavelengths of ten meters to one meter. Frequencies immediately below VHF are denoted high frequency (HF), and the next higher … See more
Radio waves in the VHF band propagate mainly by line-of-sight and ground-bounce paths; unlike in the HF band there is only some reflection at lower frequencies from the ionosphere (skywave propagation). They do not follow … See more
VHF is the first band at which wavelengths are small enough that efficient transmitting antennas are short enough to mount on vehicles and … See more
Australia
The VHF TV band in Australia was originally allocated channels 1 to 10-with channels 2, 7 and 9 … See moreVHF transmission range is a function of transmitter power, receiver sensitivity, and distance to the horizon, since VHF signals propagate under … See more
Certain subparts of the VHF band have the same use around the world. Some national uses are detailed below.
• 50–54 MHz: Amateur Radio 6-meter band.
• 108–118 … See moreIn some countries, particularly the United States and Canada, limited low-power license-free operation is available in the FM broadcast band for purposes such as micro-broadcasting and sending output from CD or digital media players to radios without auxiliary-in … See more
Wikipedia text under CC-BY-SA license- https://en.wikipedia.org/wiki/Viral_hemorrhagic_fever
Viral hemorrhagic fevers (VHFs) are a diverse group of animal and human illnesses in which fever and hemorrhage are caused by a viral infection. VHFs may be caused by five distinct families of RNA viruses: the families Filoviridae, Flaviviridae, Rhabdoviridae, and several member families of the Bunyavirales order such as Arenaviridae, and Hantaviridae. All types of VHF are characteriz…
Wikipedia · Text under CC-BY-SA license- Specialty: Infectious disease
- Other names: viral haemorrhagic fever
- https://sv.wikipedia.org/wiki/VHF
- Enligt internationella överenskommelser (Internationella teleunionen) är användningsområdena i Sverige och i stort sett i resten av Europagrovt räknat och något förenklat så här: I andra länder kan indelningen vara annorlunda. Viktiga enskilda frekvenser är bland annat 121,5 megahertz (amplitudmodulering), internationell anrops- och nödfrekvens för...
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- https://fi.wikipedia.org/wiki/VHF_(taajuusalue)
- VHF-alueella radioaallot etenevät pääosin suoran säteilyn perusteella enintään 8–30 km. Maksimietenemisetäisyyttä voi arvioida laskemalla radiohorisontti. Muita etenemistapoja tällä alueella ovat pinta-aalto, lyhyt avaruusaalto ja meteorisironta, kaikki aaltoalueen alapäässä.lähde? Erityisen alueesta tekee televisio- ja yleisradiokäytössä olevat al...
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- https://ja.wikipedia.org/wiki/VHF
WebVHF 超短波 (Very High Frequency) ウイルス性出血熱 (viral hemorrhagic fever) このページは 曖昧さ回避のためのページ です。 一つの語句が複数の意味・職能を有する場合の水 …
- https://id.wikipedia.org/wiki/Frekuensi_sangat_tinggi
WebVHF (Very high frequency atau frekuensi sangat tinggi) adalah frekuensi radio yang berkisar dari 30 MHz ke 300 MHz. Frekuensi langsung di bawah VHF ditandai frekuensi …
- https://ko.wikipedia.org/wiki/초단파
Web초단파 (超短波, VHF, very high frequency)는 국제전기통신연합 (ITU)이 할당한 [1] 30 MHz 에서 300MHz의 무선 주파수 범위이다. 파장은 1 ~ 10 미터 이다. 아날로그 텔레비전, FM …
- https://zh.wikipedia.org/wiki/甚高頻
WebVery high frequency （英语：Very high frequency） ，缩写為 VHF ，中國稱 甚高頻 ，台灣稱 特高頻 ，是指頻帶由30 MHz 到300MHz的無線電電波。. VHF多數是用作 電台 及 …
- https://pt.wikipedia.org/wiki/Frequência_muito_alta
WebVHF é o termo referido para Very High Frequency, ou seja, trata-se de uma Frequência Muito Alta, determinada para faixas de radiofrequência de 30 a 300 MHz. Esse é o sinal …
- https://commons.wikimedia.org/wiki/File:VHF_Usage.svg
WebJan 17, 2021 · Description. VHF Usage.svg. English: The VHF radio band, showing usage for television, FM radio, Digital Audio Broadcasting, amateur radio, marine radio and …
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