This work is on a walkie-talkie which 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. First used for infantry, similar designs were created for field artillery and tank units, and after the war, walkie-talkies spread to public safety and eventually commercial and jobsite work.
A walkie-talkie is a half-duplex communication device; multiple walkie-talkies use a single radio channel, and only one radio on the channel can transmit at a time, although any number can listen. The transceiver is normally in receive mode; when the user wants to talk he presses a "push-to-talk" (PTT) button that turns off the receiver and turns on the transmitter. 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.

REFERENCES

• Christopher H. Sterling (2008). Military Communications: From Ancient Times to the 21st Century. ABC-CLIO. pp. 504–. ISBN 978-1-85109-732-6.
• Wolinsky, Howard (2003-09-25). "Riding Radio Waves For 75 Years, Motorola Milestones". Chicago Sun Times. Archived from the original on 23 March 2012. Retrieved 23 March 2012.
•  "Al Gross". Lemelson-MIT Program. Retrieved 2008-12-16.
• http://www.telecomhall.ca/tour/inventors/2006/donald_l_hings/WalkieTalkie.pdf?sour
  ceid=navclient&ie=UTF-8&rls=GGLJ,GGLJ:2006-10,GGLJ:en&q=Donald+L.+Hings+. THE VANCOUVER SUN, Friday August 17, 2001 Walkie-Talkie Inventor Receives Order of Canada
• "CBC.ca - The Greatest Canadian Invention". CBC News. Archived from the original on June 29, 2007.
• http://www.rigpix.com/tokyohypower/ht750.htm Tokyo HyPower HT750
•  http://www.rigpix.com/mizuho/mizuho_mx2.htm Mizuho MX2
•  Pogue, David (5 September 2012). "Smartphone? Presto! 2-Way Radio". The New York Times. Retrieved 3 December 2012.
•   "Two Way Radios" page of IntercomsOnline.com.
• Onslow, David. "Two-Way Radio Success: How to Choose Two-Way Radios, Commercial Intercoms, and Other Wireless Communication Devices for Your Business". IntercomsOnline.com. Retrieved 2008-10-24.
• Dunlap, Orrin E., Jr. Marconi: The man and his wireless. (Arno Press., New York: 1971)
• Harlow, Alvin F., Old Waves and New Wires: The History of the Telegraph, Telephone, and Wireless. (Appleton-Century Co., New York: 1936)
• Herrick, Clyde N., Radio: Theory and Servicing. (Reston Publishing Company, Inc., Virginia 1975)
• Martin, James. Future Developments in Telecommunications 2nd Ed., (Prentice Hall Inc., New Jersey: 1977)
• Martin, James. The Wired Society. (Prentice Hall Inc., New Jersey: 1978)
• Silver, H. Ward. Two-Way Radios and Scanners for Dummies. (Wiley Publishing, Hoboken, NH, 2005, ISBN 978-0-7645-9582-0)

 

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