wireless microphones

When Did Referees Start Using Microphones?

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When Did Referees Start Using Microphones? Referees were equipped with wireless microphones in 1975. The microphones allowed officials to explain on-field rulings to a much wider audience, and fans watching on television — along with those in the stands — got a sense of the officials’ personalities for the first time. What year did NFL

Which Device Works In Half Duplex Mode?

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Which Device Works In Half Duplex Mode? In a half-duplex or semiduplex system, both parties can communicate with each other, but not simultaneously; the communication is one direction at a time. An example of a half-duplex device is a walkie-talkie, a two-way radio that has a push-to-talk button. What uses half-duplex transmission? The half-duplex mode