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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]
Citizens band radio (CB radio) is a land mobile radio system, a system allowing short-distance one-to-many bidirectional voice communication among individuals, using two-way radios operating near 27 MHz (or the 11-m wavelength) in the high frequency or shortwave band.
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 ...
A walkie-talkie, more formally known as a handheld transceiver, HT, or handheld radio, is a hand-held, portable, two-way radio transceiver. Its development during the Second World War has been variously credited to Donald Hings, radio engineer Alfred J. Gross, Henryk Magnuski and engineering teams at Motorola. First used for infantry, similar ...
Satellite view of the Yucatán Peninsula. The Maya civilization occupied the Maya Region, a wide territory that included southeastern Mexico and northern Central America; this area included the entire Yucatán Peninsula, and all of the territory now incorporated into the modern countries of Guatemala and Belize, as well as the western portions of Honduras and El Salvador. [4]
The archaeology project, which began in January 2023, has recovered 218 bags worth of ceramic pieces, three of metates (a stone used to grind grain or cocoa), two flint knives and many other ...
Lime-based cement was used to seal stonework in place, and stone blocks were fashioned using rope-and-water abrasion, and with obsidian tools. The Maya did not employ a functional wheel, so all loads were transported on litters, barges, or rolled on logs. Heavy loads were lifted with rope, but probably without employing pulleys. [220]
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