Closed-circuit radio

A closed-circuit radio is a radio that emits over a very small range, typically a college campus. This system can be achieved from two ways:

By tying into the PA System^[1]
By using existing power lines, telephones lines, pipes, etc. to transmit a carrier current^[2]

References

↑ Radio Industry: closed circuit radio station, school radio station, college dormitories
↑ The early days of armed forces radio Archived 2011-07-21 at the Wayback Machine.

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