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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

   Today's radios are usually uneconomical to repair because mass production and technological improvements in numerous areas have made them so inexpensive to buy, while the cost of human labor and workshop overheads have increased greatly in comparison. Typical insides of an antique radio, showing the vacuum tubes.

4. 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.

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6. 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 ...

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

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

   Texas Lt. Gov. Dan Patrick said U.S.-owned border wall materials, which were available for sale, were pulled from an Arizona auction at the government's request. The Lonestar State had shown ...

8. 15 holiday gifts for dementia patients and caregivers ...

   www.aol.com/15-holiday-gifts-dementia-patients...

   11. A memory phone can store photos with names and contact information. 12. Puzzles and activity books stimulate the brain and promote cognitive sharpness.. 13. Card games and board games ...

9. Ford, GM donate $1 million and contribute vehicles to Trump's ...

   www.aol.com/news/ford-donates-1-million-fleet...

   DETROIT (Reuters) -U.S. automakers Ford Motor and General Motors will donate $1 million each, along with vehicles, to U.S. President-elect Donald Trump's January inauguration, company ...