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  2. Tuned radio frequency receiver - Wikipedia

    en.wikipedia.org/wiki/Tuned_radio_frequency_receiver

    This 1920s TRF radio manufactured by Signal is constructed on a breadboard Tuning a TRF receiver, like this 5 tube Neutrodyne set from 1924 with two stages of RF amplification, was a complicated process. The three tuned circuits, controlled by the 3 large knobs, had to be tuned in unison to the new station.

  3. Antique radio - Wikipedia

    en.wikipedia.org/wiki/Antique_radio

    Audio reproduction quality of TRF sets was limited by the available loudspeakers. "High Fidelity" was not to become a radio marketing concept until the mid-1930s and was not realized until the advent of FM broadcasting. Reaction sets, also known as regenerative receivers, rely on positive feedback to achieve adequate gain. This approach ...

  4. Vintage amateur radio - Wikipedia

    en.wikipedia.org/wiki/Vintage_amateur_radio

    Repair and restoration of vintage amateur radio equipment may involve replacing vacuum tubes, reforming electrolytic capacitors if needed, replacing any faulty resistors, replacing two-wire power cords with three-wire cords except on transformerless AC/DC radios, and receiver alignment as necessary.

  5. 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.

  6. Radio receiver - Wikipedia

    en.wikipedia.org/wiki/Radio_receiver

    The Neutrodyne receiver, invented in 1922 by Louis Hazeltine, [133] [134] was a TRF receiver with a "neutralizing" circuit added to each radio amplification stage to cancel the feedback to prevent the oscillations which caused the annoying whistles in the TRF.

  7. College Football Playoff bracket picks, predictions: Who will ...

    www.aol.com/sports/college-football-playoff...

    Nearly seven years in the making, the expanded College Football Playoff will make its debut this season with Indiana at Notre Dame on Friday.. The 2024 college football season was rife with drama ...

  8. David R. Goode - Pay Pals - The Huffington Post

    data.huffingtonpost.com/paypals/david-r-goode

    From January 2008 to December 2012, if you bought shares in companies when David R. Goode joined the board, and sold them when he left, you would have a 30.7 percent return on your investment, compared to a -2.8 percent return from the S&P 500.

  9. File:Simple TRF receiver block diagram.svg - Wikipedia

    en.wikipedia.org/wiki/File:Simple_TRF_receiver...

    English: Block diagram of a tuned radio frequency (TRF) receiver, the simplest type of amplifying radio receiver circuit. It consists of one or more tuned RF amplifiers, each consisting of a tuned circuit which functioned as a bandpass filter followed by a radio frequency (RF) amplifier; a detector (demodulator) to extract the audio waveform from the radio carrier wave; followed by an audio ...

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