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By the late 1920s (and even later, it seems) there were two standard forms of receivers: regenerative, and superheterodyne. This form managed to amplify the received radio signal by using feedback from the output to input to amplify and widen the signal as compared to the original. The amplifier circuitry of a superheterodyne receiver is powered by a separate power supply from that used by the antenna and radio frequency (RF) amplifier. This is a consequence of the power supply of the amplifier, being voltage-controlled and not current-controlled, and thus incapable of providing appropriate quiescent current to the various components of a receiver.
For example, in the early 1950s, the receiver at the main California Institute of Technology (Caltech) in Pasadena was a superheterodyne receiver with 10 kW of output power. It used a combination of field effect transistors (FETs) and vacuum tubes, and was able to pick up signals in the microwave band of frequencies (~1 GHz) with output power of 5 kW. The important thing to note is that because the output power is high, it requires a considerable amount of circuit area to implement the various functions and components, and thus has a high cost to manufacture it.
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