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The generators would have likely been the station sync generator which may have doubled as the test signal generator. Most likely a Tektronix device in those days.
I am not sure why we are discussing the reference to a 13.5MHz clock. The mid eighties was before ITU R 601 sampling. The clock reference in the generators would have been 4fsc or 4X 3.58 = 14.3 MHz.
Terry
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