From: "John Mullan"
Who remembers transcription disks? Radio shows were distributed to the
radio stations on large diameter 78 RPM records. That was the reason for
the "island" turntables in radio studios, to allow overhang of the large
disks. They eventually went to phone line networks. Early television was
distributed over the phone line. The T1 line was designed to carry one
television signal.
I don't "remember" them - at least not as 78s - but I know what they were.
When I encountered them years later they had migrated to using standard
size 33-1/3 rpm LP records.
When I worked in TV in the early 70s, the network signal came down the
telephone company's microwave chain & was spit out directly to an
antenna on our remote control tower. We also sent the signal from the
studio out to the transmitter via microwave.
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