All of this made expansion of broadcast television channels into the UHF band inevitable, though the technology and broadcasting characteristics of UHF was at this time largely unproven. Although activity levels on these modes are often low, they increase dramatically during contests or when conditions are good. In the US, the FCC initially wanted to move all stations to UHF, auctioning off the VHF frequencies for cell phone use. Due to the inferiority of UHF broadcasting for analog television, the FCC counts the audience of UHF stations by half for the purposes of its national market share cap of 39%, a policy known as the UHF discount. National Telecommunications and Information Administration However, the maximum transmitter output power of the base station shall not exceed 30 watts and the mobile output power shall not exceed 30 watts. Canada shipboard radars only), 902.000-928.000            you want to search for a specific Canadian frequencies visit the Darkwing Duck Industrial, Scientific, and Medical (ISM), 40.980-41.015            A lack of capacity within the band to accommodate a fifth service with the complex over-lapping led to the fifth and final network having a significantly reduced national coverage compared to the other networks, with reduced picture quality in many areas and the use of wide-band aerials often required. Canada Post Corporation, 424.0125-428.100            Ottawa, Ontario Amateur (10 meters), 30.000-32.000            It used standard NTSC standards. UHF broadcasting became possible due to the introduction of new high-frequency vacuum tubes developed by Philips immediately prior to the opening of World War II. The first commercially licensed UHF television station was WWLP in Springfield, Massachusetts;[14] however, the first commercial UHF television station on the air was KPTV, Channel 27, in Portland, Oregon, on September 18, 1952. Similarly, pay services were also introduced in late 1992, when DWBC-TV on channel 68 began initial transmissions as a paid UHF station offers foreign programs not shown on local TV and commencing regular service in January 1993, but it was closed down as a result from intense competition from the rival Sky Cable. Of the bands available the 70 Centimetre band or allocation is the most widely used and popular of the UHF ham radio allocations. For instance, Channel 2 in the North American television frequencies is at 54 MHz, which corresponds to a wavelength of 5.5 m, and thus requires dipole antenna about 2.75 m across. Attached are the rules we have established for use of both categories of use. Military Aeronautical (Exclusive use of Canadian government), 387.000-390.000            In some American markets, such as Syracuse, New York, no full-service VHF TV stations remained. The ATUR service ceased operation in the late 1990s, freeing up the frequency for other uses. The 23 cms ham radio allocation is becoming more popular with the advent of commercially made equipment. Frequency License Type Tone Alpha Tag Description Mode Tag ; 26.96500 : … However within North America it is a popular band as it falls just below 1 GHz and it has some useful propagation properties. Updated: April 2018. Additional public safety, commercial land-mobile, and amateur radio services had allocations in Band II. Normally the upper edge of the landform acts as a knife-edge and causes the signal to diffract downwards. Canada Post Corporation, 413.7375             © 2020. Canada Family Radio Service, 462.7125            Canada Post Corporation, 469.7875             The launch of Channel 5 in 1997 added a fifth national television network to UHF, requiring deviation from the original frequency allocation plan of the early 1960s and the allocation of UHF frequencies previously not used for television (such as UK Channels 35 and 37, previously reserved for RF modulators in devices such as domestic videocassette recorders, requiring an expensive VCR re-tuning programme funded by the new network).

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