| Tuned Radio Frequency Receiver |
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The TRF receiver was patented in 1916 by Ernst Alexanderson . His concept was that each stage would amplify the desired signal while reducing the interfering ones. The final stage was often simply a Grid-leak Detector . A problem with the TRF receiver is that interelectrode capacitance causes Oscillation s and other modes in the Tuned Circuit s. In 1922, Louis Alan Hazeltine invented the Neutrodyne circuit, which - as its name implies - neutralizes these capacitances. Antique TRF receivers can often be identified by their cabinets. They typically have a long, low appearance, with a flip-up lid for access to the Vacuum Tube s and Tuned Circuit s. On their front panels there are typically two or three large dials, each controlling the tuning for one stage. Inside, along with several vacuum tubes, there will be a series of large coils. These will sometimes be tilted slightly to reduce interaction between their Magnetic Field s. SEE ALSO |
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