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Wireless Transmitters and Receivers | Loop and Break

Category: Wireless Transmitters and Receivers

Wireless Transmitters and Receivers

Specialized Wireless Modes

Specialized Wireless Modes

Some less common wireless communications techniques are effective under certain circumstances. Dual-Diversity Reception Block diagram of a dual-diversity radio receiver system. A dual-diversity receiver can reduce the fading that occurs in radio reception at...

Television Reception

Television Reception

Block diagram of a conventional FSTV receiver. A television (TV) receiver has a tunable front end, an oscillator and mixer, a set of IF amplifiers, a video demodulator, an audio demodulator and amplifier chain,...

Audio Stages

Audio Stages

Enhanced selectivity can be obtained by tailoring the frequency response in the AF amplifier stages following the detector, in addition to the RF selectivity provided in the IF amplifier stages preceding the detector. Filtering...

Detectors

Detectors

At A, envelope detection of AM, shown in the time domain. At B, slope detection of FM, shown in the frequency domain. At C, a ratio detector circuit for demodulating FM signals. At D,...

Predetector Stages

Predetector Stages

In a superhet, the stages preceding the first mixer must be designed so they provide reasonable gain, but produce as little noise as possible. They must also be capable of handling strong signals without...

Transmission Media

Transmission Media

Data can be transmitted over various media. The most common are cable, radio (also called wireless), satellite links (a specialized form of wireless), and fiber optics. Cable, radio/TV, and satellite communications use the RF...

Wave Propagation

Wave Propagation

Radio-wave propagation has been a fascinating science ever since Marconi and Tesla discovered, around the year 1900, that EM fields can travel over long distances without any supporting infrastructure whatsoever. Let’s look at a...

Pulse Modulation

Pulse Modulation

Another method of modulation works by varying some aspect of a constant stream of signal pulses. Several types of pulse modulation (PM) are briefly described in the following sections. They are diagrammed in below...

Modulation

Modulation

Modulation is the process of writing data onto an electric current or EM wave. The process can be done by varying the amplitude, the frequency, or the phase of the current or wave. Another...