1st non stop radio & tv broadcasting
 

When the 1st non stop radio & television broadcasting where introduced?

For television, probably the service in England in the 1930s?
Radio was earlier, starting with unregulated broadcasts that eventually were regulated due to the uncontrolled interference among stations.

If you mean "all night" broadcasting without signing-off or closing down, would likely have been New York radio in the 1930's ("Milkman's Matinee" on (the real) WNEW comes to mind) and probably the TV's in NYC and L.A., perhaps as early as the 1950's...

I remember some of the radio stations around here playing a smarmy jingle-"It's broadcasting's Golden Anniversary !" back in 1970, so that would have made the start of it all 1920.

As far as radio is concerned, the oldest broadcaster still around is KCBS-740 in San Francisco, which can trace its roots back to 1909. As for TV, I'd have to say WRGB in Schenectady is the oldest having started out as W2XB experimental with mechanical scanning in 1926.

Good question, radio, I don't know. I know here in Pittsburgh, WDTV on channel 3 which became KDKA-TV on channel 2 did broadcast 24 hours. They showed movies at night called "Swing Shift Theater" because at that time, Pittsburgh was an industrial city, famous for steel. There were many people who worked at night and/or were awake at night and slept during the day so we had a market for viewers. I think Channel 11, WIIC, now WPXI, signed off too, I'm not sure. Channel 4, WTAE-TV did as well as Channel 13/16 which were PBS then.

WDTV went on the air in late 1948 or early 1949.

Back when I called the least coast home, WTAE-4 would make it to Alexandria, VA on nights when no other DX signal would make it. In the early 1970's, they would run a late movie after the late news followed by the Cavett show on VTR. After Cavett was over, they would then sign-off... usually around 0230.

Cool!:banana: I remember when we were in high school 1982/85), my buddy and I stayed up late at night and put the rabbit ears on the 1982 Zenith (still use it everyday even today) to see what we can pick up. WTAE-TV did sign off and after that, we did pick up WRC from Washington DC on channel 4. WTAE back then signed off at around 1 or 1:30 AM. It's weird the signal made it as far as you, usually WTAE-TV was hard t get here in the Western suburbs of Pittsburgh, then again, we liver in hilly terrain.

It is an interesting question, and although I don't know the answer, I can suggest a way of finding out that might not be all that hard: look for old television guides, the kind that are included with the Saturday or Sunday paper. Since 24/7 broadcasting is likely to have started in a large city, look for the high-circulation papers in the five or six largest cities in the country.