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2. Trunked radio system - Wikipedia

   en.wikipedia.org/wiki/Trunked_radio_system

   A trunked radio system is a two-way radio system that uses a control channel to automatically assign frequency channels to groups of user radios. In a traditional half-duplex land mobile radio system a group of users (a talkgroup) with mobile and portable two-way radios communicate over a single shared radio channel, with one user at a time ...

3. File:Tuned radio frequency (TRF) receiver block diagram 2.svg

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

   English: Block diagram of a tuned radio frequency (TRF) receiver, a type of radio receiver circuit invented in 1916 by Ernst Alexanderson and widely used in the vacuum tube receivers of the 1920s.

4. Anderson Powerpole - Wikipedia

   en.wikipedia.org/wiki/Anderson_Powerpole

   Many pieces of amateur radio equipment run on 12-volt DC automotive voltage, which is also called 13.8-volt DC. The voltage delivered by a lead–acid battery with six-cells used as an automotive battery will vary depending on various electrical loads in a vehicle. Without loads the battery will float from 11.7 to 12.8 volts, and while charging ...

5. Multi-Use Radio Service - Wikipedia

   en.wikipedia.org/wiki/Multi-Use_Radio_Service

   To make MURS two-way radios work together, they must have matching CTCSS or DCS tones. This can usually be done via basic programming which almost all MURS two-way radios support. The goTenna, a digital radio product, operates on the MURS band and pairs with smartphones to enable users to send texts and share locations on a peer-to-peer basis ...

6. Two-way radio - Wikipedia

   en.wikipedia.org/wiki/Two-way_radio

   Naval air traffic controller communicates with aircraft over a two-way radio headset A variety of portable handheld two-way radios for private use. A two-way radio is a radio transceiver (a radio that can both transmit and receive radio waves), which is used for bidirectional person-to-person voice communication with other users with similar radios, [1] in contrast to a broadcast receiver ...

7. Tuned radio frequency receiver - Wikipedia

   en.wikipedia.org/wiki/Tuned_radio_frequency_receiver

   It has two radio frequency amplifier stages, one grid-leak detector/amplifier and three class ‘A’ audio amplifier stages. There are 3 tuned circuits T1-C1, T2-C2, and T3-C3 . The second and third tuning capacitors, C2 and C3 , are ganged together (indicated by line linking them) and controlled by a single knob, to simplify tuning.

8. Frequency allocation - Wikipedia

   en.wikipedia.org/wiki/Frequency_allocation

   The International Telecommunication Union defines frequency allocation as being of "a given frequency band for the purpose of its use by one or more terrestrial or space radiocommunication services or the radio astronomy service under specified conditions". [2] Frequency allocation is also a special term, used in national frequency ...

9. SCR-694 - Wikipedia

   en.wikipedia.org/wiki/SCR-694

   The SCR-694 is a portable high frequency two way radio set that was used by the U.S. military during World War II.The SCR-694 provides transmission and reception of AM radiotelephony and MCW or CW radiotelegraphy within the frequency range of 3.800 to 6.500 MHz.