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AM Transmitters

Block diagram of High-Level AM TransmitterTransmitters 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.

Wireless Telegraphy

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.

Tone Dialing

In tone dialing type of telephones, pressing the digit keys causes the dial network to produce specific tones that the central office recognizes and decodes.

Rotary Or Mechanical Dial

Rotary Or Mechanical DialA 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.


A teleprinter (teletypewriter, Teletype or TTY) is a electromechanical typewriter that can be used to communicate typed messages from point to point and point to multipoint over a variety of communication channels
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