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Land mobile use of a TV channel (TV RF channels 14-20 only) LM As "LM" is used in the FCC database to indicate reallocation of an entire channel, but not to identify individual users transmitting in that spectrum, a 6 MHz LM allocation does not itself carry a TV-style call sign. The spectrum of TV channels 14-20 is called "T-band" in LMR use. [17]
The C band is a designation by the Institute of Electrical and Electronics Engineers (IEEE) for a portion of the electromagnetic spectrum in the microwave range of frequencies ranging from 4.0 to 8.0 gigahertz (GHz). [1] However, the U.S. Federal Communications Commission C band proceeding and auction, designated 3.7–4.2 GHz as C band. [2]
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
Channel C was used by a relay transmitter in Glanmire, Co. Cork. Channel B video is the same as Italian Channel A video and Channel C audio is the same as Channel 4 audio. There are currently no Band I Channels used in Ireland (except on cable TV, and these have mostly been phased out for DOCSIS use) and no plans to resume using them.
Home2US Communications Inc. also offers several ethnic channels on SES 1 at 101° W, as well as other free and pay-TV channels. Many religious broadcasters reach the DTH and distribution markets with unencrypted DVB-S television and radio channels on Galaxy 19. These channels are available as part of the Glorystar Satellite Service.
The idea to give each band a number, in which the number is the logarithm of the approximate geometric mean of the upper and lower band limits in Hz, originated with B. C. Fleming-Williams, who suggested it in a letter to the editor of Wireless Engineer in 1942. For example, the approximate geometric mean of band 7 is 10 MHz, or 10 7 Hz.
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The Pan-American television frequencies are different for terrestrial and cable television systems. Terrestrial television channels are divided into two bands: the VHF band which comprises channels 2 through 13 and occupies frequencies between 54 and 216 MHz, and the UHF band, which comprises channels 14 through 36 and occupies frequencies between 470 and 608 MHz.