Information AboutWalkie-talkie |
| CATEGORIES ABOUT WALKIE-TALKIE | |
| radio | |
| motorola products | |
| wireless communications | |
| SHOPPER'S DELIGHT | |
|
A walkie-talkie is a Portable , bi-directional Radio Transceiver , first developed for Military use. Major characteristics include a Half-duplex (only one can receive and transmit at a time) channel and a Push-to-talk switch that starts Transmission . The typical physical format looks somewhat like a Telephone Handset , possibly slightly larger but still a single unit, with an Antenna sticking out of the top. 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 his immediate vicinity. Hand-held transceivers became valuable communication tools for Police , emergency services, and industrial and commercial users, using frequencies assigned for these services. Low-power versions, exempt from licence requirements, are also popular children's Toy s. Prior to the change of CB radio from License d to un-licensed status, the typical toy walkie-talkie available in Retail Store s in North America was limited to 100 Milli Watt s of power on transmit and the 27 MHz Citizens' Band channels. Other toy walkie-talkies operate in the 49 MHz band shared with cordless phones and baby monitors; typically these devices are very crude electronically and may lack even a volume control, though they may have elaborate packaging. Unlike telephones, low-cost toy walkie-talkies do not have separate microphones and speakers; the speaker is typically used as a microphone while in transmit mode. The first radio receiver/transmitter to be nick-named "Walkie-Talkie" was the backpacked Motorola SCR-300, created by an engineering team in 1940 at the Galvin Manufacturing Company consisting of Dan Noble , who conceived of the design using FM technology, Henryk Magnuski who was the principal RF engineer, Marion Bond, Lloyd Morris, and Bill Vogel. Motorola also produced the hand-held AM SCR-536 radio during the war, and it was called the "Handie-Talkie" (HT). Canadian Al Gross also worked on the early technology behind the walkie-talkie between 1934 and 1941, and is sometimes said to actually have invented it. The personal walkie-talkie has now become popular again with the Family Radio Service . FRS operates in the GMRS Band , which is also used for Business walkie-talkies and mobile radios. While FRS walkie-talkies are popular Toy s, they are also a useful communication tool for business and personal use. SEE ALSO EXTERNAL LINKS
|