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Selective calling. In a conventional, analog two-way radio system, a standard radio has noise squelch or carrier squelch, which allows a radio to receive all transmissions. Selective calling is used to address a subset of all two-way radios on a single radio frequency channel. Where more than one user is on the same channel (co-channel users ...
By 1990, wide-area paging had been invented and over 22 million pagers were in use. Their number exploded and by 1994, there were over 61 million pagers in use. Motorola’s Pageboy II Pageboy II. Motorola’s Pageboy II was launched in 1975 for the United States and 1976 for Europe in various types. Pb II 5-tone only 68–88 MHz / 146–174 ...
Motorola Minitor. Front view of the Minitor V pager. The Motorola Minitor is a portable, analog, receive only, voice pager typically carried by fire, rescue, and EMS personnel (both volunteer and career) to alert of emergencies. The Minitor, slightly smaller than a pack of cigarettes, is carried on a person and usually left in selective call mode.
Motorola Defy: 2010/10 D Android 2.0 "Eclair" Motorola Bravo: 2010/11 D Android 2.1 "Eclair" Motorola Droid Pro: 2010/11 D Android 2.2 "Froyo" Motorola Flipside: 2010/11 D Android 2.2 "Froyo" Motorola Atrix 4G: 2011/02 D Android 2.3 "Gingerbread" Motorola Droid 3: 2011/07 D Android 2.3 "Gingerbread" Motorola Droid Bionic: 2011/09 D
A paging system alerts a pager (or group of pagers) by transmitting information over an RF channel, including an address and message information. This information is formatted using a paging protocol, such as 2-tone, 5/6-tone, GOLAY, POCSAG, FLEX, ERMES, or NTT. Two-way pagers and response pagers typically use the ReFLEX protocol.
FLEX (protocol) FLEX is a communications protocol developed by Motorola and used in many pagers. FLEX provides one-way communication only (from the provider to the pager device), but a related protocol called ReFLEX provides two-way messaging.
Another widely used system is the Continuous Tone-Coded Squelch System (CTCSS) also referred to as subaudible tones or PL tones (a Motorola trademark). This uses single audio tones in the range from 67 to 257 Hz to address each message to a specific radio or a group (or fleet) of radios. Each radio or group is assigned a different tone frequency.
The Motorola PageWriter 2000 was a two-way pager introduced in 1998. [1] Featuring the 68000 based Motorola DragonBall processor, 1 MB of internal storage, a four color grayscale screen, IrDA transmitter/receiver, and a full QWERTY keyboard the PageWriter represented a combination of both PDA and pager in one package.
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