Cable Television Interference Issues
The use of 45.75 MHz as an intermediate frequency within television receivers became commonplace after UHF reception became an option in 1953. Channel 1's signal on this frequency (over the air, or on analogue cable) could create interference internally within TV's.
Most cable systems use frequencies below 54 MHz (VHF TV 2) for communication back to the cable provider from cable modems and digital apparatus, so any "Cable 1" channel needs to avoid operation on the original VHF Channel 1 frequencies from the pre-1948 bandplans. As such, "cable 1" is not related to the original 44-50 MHz VHF channel except in name. It operates always at some higher frequency - often with channels 00 and 01 merely aliased to 98/99 or 100/101.
HRC and IRC systems increase the spacing between channels 4 and 5 to a non-standard 6 MHz, inserting "cable 1" between channels four and five. This non-standard spacing is rarely-used, is not compatible with all television receivers and has the effect of pushing channel six partially into the FM broadcast band.
Read more about this topic: Channel 1 (North American TV)
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