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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. Online auction selling property of defunct Newcomerstown ...

    www.aol.com/online-auction-selling-property...

    NEWCOMERSTOWN ‒ The vehicles and equipment of the former Newcomerstown Emergency Rescue Squad, Inc. (NERS) are being sold through an online auction.. The auction, conducted by the company ...

  4. Deersville Historic District - Wikipedia

    en.wikipedia.org/wiki/Deersville_Historic_District

    The Deersville Historic District is located along Main Street in Deersville, Ohio. The buildings in the district include several houses, a community hall, a general store, two inns, a church, and an antique store, many of which are closed. The district was added to the National Register on October 27, 2004.

  5. 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 ...

  6. National Register of Historic Places listings in Madison ...

    en.wikipedia.org/wiki/National_Register_of...

    This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Madison County, Ohio, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in a Google map.

  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. Rare dime bought by Ohio farm family and hidden for decades ...

    www.aol.com/rare-dime-bought-ohio-farm-142306011...

    An extraordinarily rare dime whose whereabouts had remained a mystery since the late 1970s has sold for just over $500,000. The coin, which was struck by the U.S. Mint in San Francisco in 1975 ...

  9. Reflex receiver - Wikipedia

    en.wikipedia.org/wiki/Reflex_receiver

    The receiver functions as a tuned radio frequency (TRF) receiver. The radio frequency (RF) signal from the tuned circuit ( bandpass filter ) is amplified, then passes through the high pass filter to the demodulator , which extracts the audio frequency (AF) ( modulation ) signal from the carrier wave .

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