Transmitters that transmit AM signals are known as AM transmitters. These transmitters are used in medium wave (MW) and short wave (SW) frequency bands for AM broadcast.
At the transmitter side, when the key is pressed, the telegraph signal current passes through the modulator, where high frequency signal from the osc is also received.
This was the first automatic telephone system introduced by Almon B. Strowger. This system uses selectors for switching.
A Rotary Or Mechanical Dial is an impulse sending device. When the subscriber lifts his handset, the D.C. loop is completed and steady current flows through the line provided by the exchange.
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