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The Portable People Meter (PPM), also known as the Nielsen Meter, was a system developed by Arbitron (now Nielsen Audio) to measure how many people are exposed to individual radio stations and television stations. This also includes cable television. The PPM is worn like a pager and detects hidden audio tones within a station or network's audio ...
Pager. A pager, also known as a beeper or bleeper, [1] is a wireless telecommunications device that receives and displays alphanumeric or voice messages. One-way pagers can only receive messages, while response pagers and two-way pagers can also acknowledge, reply to, and originate messages using an internal transmitter. [2]
History. Philippine Wireless Inc. introduced PocketBell in the 1970s, becoming the first company to make pagers commercially available in the Philippines. From the 1970s until the mid-1980s, it virtually maintained a monopoly in the pager industry in the country. After the 1986 People Power Revolution which deposed President Ferdinand Marcos ...
Motorola Pageboy was the second pager produced by Motorola with individual-unit addressing, [clarification needed] after the lesser-known "Handie-Talkie Radio Pocket Pager" from 1955. [citation needed] The first pager-like system was used in 1921 by the Detroit Police Department. However, the first pager that we would today recognize as such ...
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.
Each pager group is allocated to one of the 16 transmission batches [A...P]. The pager needs only to be active during the period it has been allocated to, allowing it to go into sleep mode 15/16 (~=93%) of the time (a ~7% duty cycle). This scheduling allocation protocol extends the battery life of the pager by several orders of magnitude.
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