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A regenerative receiver, by contrast, could often provide adequate reception with the use of only one tube. In the 1930s the regenerative receiver was replaced by the superheterodyne circuit in commercial receivers due to the superheterodyne's superior performance and the falling cost of tubes.
Many were dedicated types with special functions, such as VHF receivers for police and fire channels built into a CB radio. The company's best selling products were often shortwave receivers, parts, and portable radios. In the 1960s, many Lafayette brand radios were rebranded Trio-Kenwood sets. A significant share of 1960s and 1970s vintage ...
A crystal set receiver consisting of an antenna, a variable inductor, a cat's whisker, and a filter capacitor. A crystal receiver is very simple and can be easy to make or even improvise, for example, the foxhole radio. However, the crystal radio needs a strong RF signal and a long antenna to operate.
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.
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 ...
A tuned radio frequency receiver (or TRF receiver) is a type of radio receiver that is composed of one or more tuned radio frequency (RF) amplifier stages followed by a detector (demodulator) circuit to extract the audio signal and usually an audio frequency amplifier. This type of receiver was popular in the 1920s.
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