Abstract
The master control system installed in Montreal headquarters of the Canadian Broadcasting Corporation, apart from being one of the largest on the North American Continent, is noteworthy for the fact that all the system wiring is carried out in unshielded telephone cable. It is estimated that nearly half a million feet of wire were used. In spite of this, the signal/crosstalk ratio has been kept better than 75 db for interfering signals (at full level) of frequencies up to about 4000 cycles and better than the RTMA specification figure of 65 db up to about 10,000 cycles. This paper describes the methods and precautions used throughout the installation to produce these results.
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