Wireless Transmitters and Receivers

Oscillation and Amplification

A radio transmitter employs one or more oscillators to generate an RF signal, and amplifiers […]

Modulation is the process of writing data onto an electric current or EM wave. The […]

Another method of modulation works by varying some aspect of a constant stream of signal […]

Time-domain graphs of various modes of pulse modulation. At A, pulse amplitude modulation; at B, […]

Nonmoving images can be sent within the same bandwidth as voice signals. For high-resolution, moving […]

In a radio or television transmitting antenna, electrons are moving back and forth at an […]

Radio-wave propagation has been a fascinating science ever since Marconi and Tesla discovered, around the […]

Data can be transmitted over various media. The most common are cable, radio (also called […]

A wireless or radio receiver converts EM waves into the original messages sent by a […]

In a superhet, the stages preceding the first mixer must be designed so they provide […]

At A, envelope detection of AM, shown in the time domain. At B, slope detection […]

Enhanced selectivity can be obtained by tailoring the frequency response in the AF amplifier stages […]

Block diagram of a conventional FSTV receiver. A television (TV) receiver has a tunable front […]

Some less common wireless communications techniques are effective under certain circumstances. Dual-Diversity Reception Block diagram […]