22 Facts About Radio receiver

The receiver uses electronic filters to separate the desired radio frequency signal from all the other signals picked up by the antenna, an electronic amplifier to increase the power of the signal for further processing, and finally recovers the desired information through demodulation.

The most familiar type of radio receiver for most people is a broadcast radio receiver, which reproduces sound transmitted by radio broadcasting stations, historically the first mass-market radio application.

Radio receiver is connected to an antenna which converts some of the energy from the incoming radio wave into a tiny radio frequency AC voltage which is applied to the receiver's input.

The degree of amplification of a radio receiver is measured by a parameter called its sensitivity, which is the minimum signal strength of a station at the antenna, measured in microvolts, necessary to receive the signal clearly, with a certain signal-to-noise ratio.

The bandwidth of a filter increases with its center frequency, so as the TRF Radio receiver is tuned to different frequencies its bandwidth varies.

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RF filter on the front end of the receiver is needed to prevent interference from any radio signals at the image frequency.

At the cost of the extra stages, the superheterodyne Radio receiver provides the advantage of greater selectivity than can be achieved with a TRF design.

The total amplification of the Radio receiver is divided between three amplifiers at different frequencies; the RF, IF, and audio amplifier.

One of the most important parameters of a Radio receiver is its bandwidth, the band of frequencies it accepts.

Radio receiver waves were first identified in German physicist Heinrich Hertz's 1887 series of experiments to prove James Clerk Maxwell's electromagnetic theory.

The Radio receiver would have a resonant circuit, and could receive a particular transmission by "tuning" its resonant circuit to the same frequency as the transmitter, analogously to tuning a musical instrument to resonance with another.

The heterodyne Radio receiver remained a laboratory curiosity until a cheap compact source of continuous waves appeared, the vacuum tube electronic oscillator invented by Edwin Armstrong and Alexander Meissner in 1913.

At the beginning of the 1920s the radio receiver was a forbidding high-tech device, with many cryptic knobs and controls requiring technical skill to operate, housed in an unattractive black metal box, with a tinny-sounding horn loudspeaker.

The receiver market was divided into the above broadcast receivers and communications receivers, which were used for two-way radio communications such as shortwave radio.

Vacuum-tube receiver required several power supplies at different voltages, which in early radios were supplied by separate batteries.

Vacuum tubes were bulky, expensive, had a limited lifetime, consumed a large amount of power and produced a lot of waste heat, so the number of tubes a Radio receiver could economically have was a limiting factor.

Therefore, a goal of tube Radio receiver design was to get the most performance out of a limited number of tubes.

The major radio receiver designs, listed below, were invented during the vacuum tube era.

Radio receiver was the first to give a correct explanation of how De Forest's triode tube worked.

Radio receiver invented the feedback oscillator, regenerative receiver, the superregenerative receiver, the superheterodyne receiver, and modern frequency modulation .

Since the bandwidth of a filter with a given Q is proportional to the frequency, as the Radio receiver is tuned to higher frequencies its bandwidth increases.

Since the marginal cost of adding additional amplifying devices to the chip was essentially zero, the size and cost of the Radio receiver was dependent not on how many active components were used, but on the passive components; inductors and capacitors, which could not be integrated easily on the chip.