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It was originally required by the FCC for remote controlled transmitter stations. The studio had a Tektronix 147 inserter which stripped anything that was already on line 19 and insert the vir. The output fed the STL. At the transmitter there was a Tektronix 1440 which looked at the inserted vir and controlled luma, color and phase.
I remember there was a non-remote station that never had anything in the vertical interval. They even stripped the network vits.
We later upgraded the studio to the Tektronix 1910 which had GCR. We got calls from cable companies if the GCR was malfunctioning.
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Last edited by kf4rca; 09-26-2016 at 05:35 PM.
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09-26-2016, 05:25 PM
Hybrid Mode
