Tuesday, February 24, 2015

दिन विशेष - फेब्रुवारी २५


Donald Hings

inventor of Walkie - Talkie

Died - February 25, 2004

Donald Lewes Hings, CM MBE (November 6, 1907 – February 25, 2004) was a Canadian inventor. In 1937[1] he created a portable radio signaling system for his employer CM&S, which he called a "packset", but which later became known as the "Walkie-Talkie".

A walkie-talkie (more formally known as a handheld transceiver, or HT) is a hand-held, portable, two-way radio transceiver. Its development during the Second World War has been variously credited to Donald L. Hings, radio engineer Alfred J. Gross, and engineering teams at Motorola. Similar designs were created for other armed forces, and after the war, walkie-talkies spread to public safety and eventually commercial and jobsite work. Major characteristics include a half-duplex channel (only one radio transmits at a time, though any number can listen) and a "push-to-talk" (PTT) switch that starts transmission. Typical walkie-talkies resemble a telephone handset, possibly slightly larger but still a single unit, with an antenna mounted on the top of the unit. Where a phone's earpiece is only loud enough to be heard by the user, a walkie-talkie's built-in speaker can be heard by the user and those in the user's immediate vicinity. Hand-held transceivers may be used to communicate between each other, or to vehicle-mounted or base stations.
[2/25, 7:07 AM] ‪+91 98205 30394‬: Donald Hings

inventor of Walkie - Talkie

Died - February 25, 2004

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