As a virtual channel, however, KAXT-CD in San Francisco (broadcasting on physical UHF channel 22) was assigned virtual channel 1 in July 2009, becoming the first American station to be assigned virtual channel 1 via the digital television PSIP standard, which shows the channel as such on a digital television set. KAXT-CD's physical broadcasts on UHF channel 22 cause no interference for Channel 1 physically. Community television In 1946, prior to cable TV and the invention of public-access television channels, the FCC decided to reserve channel 1 for low-power Community television stations, and moved existing channel 1 stations to higher frequencies. Community television stations covered smaller cities and were allowed to use less radiated power. None of these stations were built before the FCC imposed a freeze on all television station construction permits in mid-1948, and removed the channel one allocations. A shared (non-primary) allocation From 1945 to 1948 TV stations in the U.S. shared Channel 1 and other channels with fixed and mobile services. The FCC decided in 1948 that a primary (non-shared) allocation of the VHF radio spectrum was needed for television broadcasting. Except for selected VHF frequencies in Alaska and Hawaii (and some overseas territories) the FCC-administered VHF band is primarily allocated for television broadcasting to this day. The FCC in May 1948 formally changed the rules on TV band allocations based on propagation knowledge gained during the era of shared-user allocations. The 44–50 MHz band used by Channel 1 was replaced by lower-power narrowband users. Channel 1 was reassigned to fixed and mobile services (44–50 MHz) in order to end their former shared use of other VHF TV frequencies. Rather than renumber the TV channel table, it was decided to merely remove Channel 1 from the table. Cable television On cable television systems, channel 1 was optionally used by some providers in between channels 4 and 5 at the frequencies of 72–78 MHz (moving channel 5 and 6 allocations up by 2 MHz; however, this would prevent channels 5 and 6 from being viewed on non-cable-ready television sets). Channel 1, where available, has also been mapped to 99 (frequency range 114–120 MHz) on some cable boxes. Modern allocations 43–50 MHz As of September 2000, the Federal Spectrum Use of the band (which is regulated by the NTIA and not the FCC) was as follows: 43.69–46.6 Non-Military Land Mobile Radio (LMR):Primarily used by Federal agencies for mutual