I grew up in the 50s and 60s watching the lines at the top of the TV
screen change in black and white segments according to their coded
information. My Dad had adjusted our set so he could see those lines.
(He was a field service specialist for Canadian General Electric.)
I think the network timing information was in "line 6", though I might
not remember accurately. There was all kinds of other information in
those lines at the top, although only technical people knew about it
because most TV sets were adjusted so you couldn't see them.
73,
... Martin VE3OAT
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