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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 ...
Portable magnetic-loop cave radios have been used by cavers for two-way communication and cave surveying since the 1960s. [1] In a typical setup the transmitting loop, consisting of many turns of copper wire, is oriented horizontally within the cave using a spirit level, and driven at a few kHz. Though such a small antenna is a very poor ...
Starting in 1958, EICO produced amateur radio equipment often in kit form, such as the EICO 720 and 730 transmitters. Later in the 1960s they made the EICO 753 SSB transceiver for amateur radio use. Unfortunately problems with the 753--or seven drifty three-- damaged their reputation which led to their decline.
Walkie-talkie – a battery-powered portable handheld half-duplex two-way radio, used in land mobile radio systems. [99] Airband – Half-duplex radio system used by aircraft pilots to talk to other aircraft and ground-based air traffic controllers. This vital system is the main communication channel for air traffic control.
The SCR-536 is often considered the first of modern hand-held, self-contained, "handie talkie" transceivers (two-way radios). It was developed in 1940 by a team led by Don Mitchell, chief engineer for Galvin Manufacturing (now Motorola Solutions) and was the first true hand-held unit to see widespread use. [1]
RCA antique radios, and early color television receivers such as the RCA Merrill/CT-100, are among the more sought-after collectible radios and televisions, due to their popularity during the golden age of radio and the historic significance of the RCA name, as well as their styling, manufacturing quality and engineering innovations. Most ...
EM34 tuning eye EM84 tuning indicator. A magic eye tube or tuning indicator, in technical literature called an electron-ray indicator tube, [1] is a vacuum tube which gives a visual indication of the amplitude of an electronic signal, such as an audio output, radio-frequency signal strength, or other functions. [1]
The term All American Five (abbreviated AA5) is a colloquial name for mass-produced, superheterodyne radio receivers that used five vacuum tubes in their design. These radio sets were designed to receive amplitude modulation (AM) broadcasts in the medium wave band, and were manufactured in the United States from the mid-1930s until the early 1960s.