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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. 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.

  4. Vintage amateur radio - Wikipedia

    en.wikipedia.org/wiki/Vintage_amateur_radio

    Collins S-Line, featuring separate power supply, receiver, transmitter, and speaker console, c. 1960s. Amateur radio equipment of past eras like the 1940s, 50s, and 60s that are separate vacuum tube transmitters and receivers (unlike modern transceivers) are an object of nostalgia, and many see rehabilitation and on-air use by enthusiasts. [18 ...

  5. Texas State University System - Wikipedia

    en.wikipedia.org/wiki/Texas_State_University_System

    The Texas State University System (TSUS) is a public university system in Texas. It was created in 1911 to oversee the state's normal schools. It has since broadened its focus and comprises institutions of many different scopes. [1] It is the only public university system in the state without a flagship university. [4]

  6. An honor and an expense: How Texas State University ... - AOL

    www.aol.com/honor-expense-texas-state-university...

    In November, the Commission on Presidential Debates announced that Texas State University, about 30 miles south of Austin, would host the first of four presidential debates Sept. 16 at Strahan ...

  7. 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 ...

  8. Regenerative circuit - Wikipedia

    en.wikipedia.org/wiki/Regenerative_circuit

    Regenerative receivers require fewer components than other types of receiver circuit, such as the TRF and superheterodyne. The circuit's advantage was that it got much more amplification (gain) out of the expensive vacuum tubes , thus reducing the number of tubes required and therefore the cost of a receiver.

  9. Texas wants to buy surplus border wall parts but U.S ... - AOL

    www.aol.com/news/texas-wants-buy-surplus-border...

    Texas officials try to intercept sale of surplus border wall materials Patrick noted that Texas became aware of the materials slated for auction on Dec. 12, the same day the Daily Wire reported ...

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