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A radio transmitter design has to meet certain requirements. These include the frequency of operation, the type of modulation, the stability and purity of the resulting signal, the efficiency of power use, and the power level required to meet the system design objectives. [1]
The basic problem is the amplifying element is dissipating power. Switching Class C amplifiers are nonlinear, but they can be better than 50 percent efficient because an ideal switch does not dissipate any power. A clever design can use the nonlinear Class C amplifier for both gain and as a frequency multiplier.
Bluetooth devices intended for use in short-range personal area networks operate from 2.4 to 2.4835 GHz. To reduce interference with other protocols that use the 2.45 GHz band, the Bluetooth protocol divides the band into 80 channels (numbered from 0 to 79, each 1 MHz wide) and changes channels up to 1600 times per second.
The main transmitter module was a cigar-sized device that weighed 7 ounces (200 g), contained the microphone and circuitry including four junction transistors (a two-transistor audio amplifier, a one-transistor oscillator/modulator similar to the one described by Thomas, and a final RF amplifier), and was suspended around the user's neck in ...
Guitar wiring refers to the electrical components, and interconnections thereof, inside an electric guitar (and, by extension, other electric instruments like the bass guitar or mandolin). It most commonly consists of pickups , potentiometers to adjust volume and tone, a switch to select between different pickups (if the instrument has more ...
In electronics, an antenna amplifier (also: aerial amplifier or booster) is a device that amplifies an antenna signal, usually into an output with the same impedance as the input impedance. Typically 75 ohm for coaxial cable and 300 ohm for twin-lead cable. An antenna amplifier boosts a radio signal considerably for devices that receive radio ...