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2. Crystal radio - Wikipedia

   en.wikipedia.org/wiki/Crystal_radio

   Standard headphones used in telephone work had a low impedance, often 75 Ω, and required more current than a crystal radio could supply. Therefore, the type used with crystal set radios (and other sensitive equipment) was wound with more turns of finer wire giving it a high impedance of 2000–8000 Ω.

3. Heil Sound - Wikipedia

   en.wikipedia.org/wiki/Heil_Sound

   Heil Sound Communications, Inc is an American manufacturer of professional audio equipment based in Fairview Heights, Illinois. The company was founded by Bob Heil in 1966, and is well known for inventions in live sound, the Heil Talk Box and a variety of high-quality microphones and headsets for use in commercial and amateur radio. [ 1][ 2 ...

4. Headphones - Wikipedia

   en.wikipedia.org/wiki/Headphones

   Headphones connect to a signal source such as an audio amplifier, radio, CD player, portable media player, mobile phone, video game console, or electronic musical instrument, either directly using a cord, or using wireless technology such as Bluetooth, DECT or FM radio. The first headphones were developed in the late 19th century for use by ...

5. Bluetooth - Wikipedia

   en.wikipedia.org/wiki/Bluetooth

   Bluetooth is a short-range wireless technology standard that is used for exchanging data between fixed and mobile devices over short distances and building personal area networks (PANs). In the most widely used mode, transmission power is limited to 2.5 milliwatts, giving it a very short range of up to 10 metres (33 ft).

6. Audio headset - Wikipedia

   en.wikipedia.org/wiki/Audio_headset

   Headsets are available in single-earpiece and double-earpiece designs. Double-earpiece headsets may support stereo sound or use the same monaural audio channel for both ears. Single-earpiece headsets free up one ear, allowing better awareness of surroundings. Telephone headsets are monaural, even for double-earpiece designs, because telephone ...

7. FM broadcasting - Wikipedia

   en.wikipedia.org/wiki/FM_broadcasting

   It belongs to FM radio station KWNR, in Henderson, Nevada, and broadcasts at 95.5 MHz. FM broadcasting is a method of radio broadcasting that uses frequency modulation ( FM) of the radio broadcast carrier wave. Invented in 1933 by American engineer Edwin Armstrong, wide-band FM is used worldwide to transmit high-fidelity sound over broadcast radio.

8. Push-to-talk - Wikipedia

   en.wikipedia.org/wiki/Push-to-talk

   Push-to-talk. Push-to-talk ( PTT ), also known as press-to-transmit, is a method of having conversations or talking on half-duplex communication lines, including two-way radio, using a momentary button to switch from voice reception mode to transmit mode. CB radio with push-to-talk microphone switch.

9. Setcom Corporation - Wikipedia

   en.wikipedia.org/wiki/Setcom_Corporation

   Industry. Two-way radio. Founded. 1970. Headquarters. Austin, Texas. Setcom Corporation is an American manufacturer of communications equipment for police motorcycle officers, firefighters, rescue personnel and industrial users. Setcom supplies public safety professionals in all fifty states, most major US cities, and more than twenty countries ...