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Very high frequency (VHF) is the ITU designation [1] [2] [3] 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 frequencies are known as ultra high ...
The 800 MHz frequency band is a portion of the electromagnetic spectrum, or frequency band, that encompasses 790–862 MHz.. Being a part of the spectrum known as "UHF Bands IV and V" (i.e. 470 MHz to 862 MHz) it was allocated by the ITU to Broadcasting as the primary user in Region 1 and was used for analogue television broadcasting before changing to digital terrestrial television in many ...
Other series include the 100, 500, and the 2000 series. Kenwood also offers a "B" model, which is a transceiver without display or controls and is completely controlled by a remote computer or a separate control unit. Radios with built-in digital data modes and modems (for APRS)
A radio band is a small frequency band (a contiguous section of the range of the radio spectrum) in which channels are usually used or set aside for the same purpose. To prevent interference and allow for efficient use of the radio spectrum, similar services are allocated in bands.
Marine VHF radio is a worldwide system of two way radio transceivers on ships and watercraft used for bidirectional voice communication from ship-to-ship, ship-to-shore (for example with harbormasters), and in certain circumstances ship-to-aircraft.
VHF analog TV ceased in New Zealand on 1 December 2013. Channels 10 and 11 weren't added until the late 1980s (except Indonesia). VHF analog TV channel 1A is only used in Indonesia. VHF is currently no longer used for television in Indonesia (except in some regions until 2022) and only UHF is used for both analog and digital television, as in ...
The VRC-12 series includes the VRC-12 and VRC-43 to 49. which consist of various combinations of three basic components, two receiver-transmitter models, the RT-246 and the RT-524, and an auxiliary receiver, the R-442. The RT-246 can select one of ten frequencies preset by the operator.
The system was developed for VHF (also known as VHF-3) band (part of RF band lower than 300 MHz.) Some of the most important specs are listed below. [15] Channel spacing for CCIR television System B (VHF Bands) The separation between the aural and visual carriers is 5.5 MHz. Frame rate: 25 Hz; Interlace: 2/1; Field rate: 50 Hz [16] Lines/frame: 625