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  2. Regenerative circuit - Wikipedia

    en.wikipedia.org/wiki/Regenerative_circuit

    Although the superheterodyne receiver is the most common receiver in use today [citation needed], the regenerative radio made the most out of very few parts. In World War II the regenerative circuit was used in some military equipment.

  3. Q multiplier - Wikipedia

    en.wikipedia.org/wiki/Q_multiplier

    It is a regenerative amplifier adjusted to provide positive feedback within the receiver. This has the effect of narrowing the receiver's bandwidth, as if the Q factor of its tuned circuits had been increased. The Q multiplier was a common accessory in shortwave receivers of the vacuum tube era as either a factory installation or an add-on ...

  4. Crystal radio - Wikipedia

    en.wikipedia.org/wiki/Crystal_radio

    Crystal radios are the simplest type of radio receiver [2] and can be made with a few inexpensive parts, such as a wire for an antenna, a coil of wire, a capacitor, a crystal detector, and earphones (because a crystal set has insufficient power for a loudspeaker). [3]

  5. Audion receiver - Wikipedia

    en.wikipedia.org/wiki/Audion_receiver

    An audion receiver makes use of a single vacuum tube or transistor to detect and amplify signals. It is so called because it originally used the audion tube as the active element. Unlike a crystal detector or Fleming valve detector, the audion provided amplification of the signal as well as detection.

  6. National Radio Company - Wikipedia

    en.wikipedia.org/wiki/National_Radio_Company

    By the early 1930s National had established a reputation with the amateur radio community based upon their line of regenerative receivers, including the SW-3 and SW-5. National HRO receiver, circa 1938 Logo of National Company, late 1940s. In 1935 National introduced their top-of-the-line HRO receiver. This radio included two RF stages and a ...

  7. Neutrodyne - Wikipedia

    en.wikipedia.org/wiki/Neutrodyne

    The Neutrodyne radio receiver, invented in 1922 by Louis Hazeltine, was a particular type of tuned radio frequency (TRF) receiver, in which the instability-causing inter-electrode capacitance of the triode RF tubes is cancelled out or "neutralized" [1] [2] to prevent parasitic oscillations which caused "squealing" or "howling" noises in the speakers of early radio sets.

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