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Les radios professionnelles ICOM sont disponibles en VHF et UHF avec différentes bandes de fréquences : en VHF sur la bande 136-174 MHz. en UHF sur la bande 400-470 MHz (technologie NXDN, norme dPMR) Sur le plan matériel, les radios VHF et UHF sont quasiment identiques, seules les antennes ont une longueur légèrement différente, les ...
15 de ago. de 2020 · In general, VHF radios operate in the 138-174 MHz frequency band and UHF radios operate in the 400-512 MHz frequency band making UHF roughly three times higher in frequency than VHF. One important characteristic of radio waves is the wavelength which is the distance between peaks on a wave: Wavelength is inversely proportional to the frequency.
UHF e VHF sono stati utilizzati ciascuno in situazioni di comunicazione specifiche. Ad esempio, VHF è normalmente la banda preferita per le trasmissioni radio FM, mentre l’UHF è stata spesso la banda preferita per l’uso nelle trasmissioni televisive via etere. Al contrario, la gamma superiore della banda UHF è spesso utilizzata per le ...
Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band as the wavelengths range from one meter to one tenth of a meter (one decimeter).Radio waves with frequencies above the UHF band fall into the super-high frequency (SHF) or microwave frequency range.
12 de mar. de 2019 · UHF radio waves are smaller than VHF. This means that UHF frequencies have smaller waves that produce a wider reception. While VHF has longer wave lengths. UHF are more likely to pass barriers like trees and building walls easier. VHF range is reduced due to signal degradation with barriers such as trees or hills.
27 de mar. de 2023 · uhf帯の電波は、vhf帯に比べ雑音の少ない良好な画質が得られる一方、vhf帯よりも障害物に弱く、山、丘、ビルなどで遮られた場合に受信が難しくなってしまうという特徴があります。そのため、uhfアンテナは見通しのよい場所に設置する必要があるのです。
19 de jul. de 2022 · Within VHF (band 8) and UHF (band 9), frequency licences are issued to communication, radio, and TV broadcasters allocating their portion of the radio spectrum over which they can transmit. In the US, for instance, TV channels 2 to 13 are VHF and occupy the range of frequencies between 54 MHz to 216 MHz.
