SUMMARY

2-33 MULTIPLEXING is a method for simultaneous transmission of two or more signals over a common carrier wave. An ORDER-WIRE CIRCUIT is a circuit between operators used for operations control and coordination. RECEPTION is when an electromagnetic wave passes through a receiver antenna and induces a voltage in that antenna. DETECTION is the separation of low-frequency (audio) intelligence from the high (radio) frequency carrier. REPRODUCTION is the process of converting electrical signals to sound waves. This sound is speech, music, and so on. SENSITIVITY of a receiver is the ability to reproduce weak signals. The greater the receiver sensitivity, the weaker the signal that will be reproduced. Receiver SELECTIVITY is the ability to select the desired signal and reject unwanted signals. NOISE SILENCER, NOISE SUPPRESSOR, or NOISE LIMITER, are circuits that clip the peaks of the noise spikes in a receiver. SQUELCH is a circuit that cuts off the output of a receiver when there is no input. A BALANCED-PHASE DETECTOR or PHASE-DISCRIMINATOR is a circuit that controls the oscillator frequency (afc).