Category:Radio receiver type

A radio receiver converts radio waves into an electric signal that can be converted into sound by a speaker. Receivers can work on different electronic principles; as a result, there are two basic receiver types:
 * Tuned radio frequency receiver: TRF receivers are tuned into one particular frequency. These were prefered in radios of the 1920's, since they were cheaper to build, easier to use, and less costly to operate.
 * Superheterodyne receiver: Invented in 1918 by Edwin Armstrong and quickly adopted for use in US military radios, "superhet" receivers process the radio signal to an intermediate frequency. These began to displace TRF receivers in the 1930's as vacuum tube technology improved and the growing number of radio stations limited the usefulness of TRF receivers.