Late 1940's RCA TV design- Adjacent Channel Rejection

[Tim Tress]

UHF stations had a hard time in the 1950s. For example, Pittsburgh's channel 53 was on and dark twice, from two different locations, before staying on for good in the late 1970s. Cable TV was a big help; the UHF tuners in some of the old sets were not too sensitive.

[old_tv_nut]

Originally Posted by Electronic M

I think you're both wrong...
All new sets sold were mandated to have UHF tuners in 1964.

...

You are correct. the all-channel act was passed in 1961 and FCC regs based on it required all sets to have UHF starting in 1964.