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A variation to the single tone scheme was seen in one-way paging receivers. In some two-tone sequential systems, sending 4–8 seconds of the second tone pages all receivers which have a code including the second tone. This is sometimes referred to as long tone B. Receivers made by Plectron and often used to page volunteer firefighters use a ...
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 MHz (US and Eur). Pb II tone only for 5-tone 80,6–88 MHz / 146–174 MHz (US). Pb II tone & voice radio for 2-tone signalling systems 68–88 MHz / 146–174 MHz (US).
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.
The Motorola Pageboy used to be very popular with fire brigades as an alarm receiver and, thanks largely to the success of this initial venture, pagers quickly began to replace public announcement systems in hospital and factories. The pager was activated by a 2-tone code, after which a voice message was transmitted.
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.
A Motorola Envoy. The Motorola Envoy Personal Wireless Communicator was a personal digital assistant initially slated for release by Motorola in summer 1994 but delayed and then available for public sale in February 1995. [1] [2] It was built to run General Magic's Magic CAP operating system, and it combined wireless, telephone, and infrared ...
FLEX provides one-way communication only (from the provider to the pager device), but a related protocol called ReFLEX provides two-way messaging. Protocol [ edit ] Transmission of message data occurs in one of four modes: 1600/2, 3200/2, 3200/4, or 6400/4.
Motorola PageWriter 2000. 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.