Vibrating pager Later pagers used digital messages, first numeric and later alphanumeric, to provide the recipient with more rmation. Other radio bands used for pagers include the 400MHz band, the VHF band, and the FM mercial broadcast band (88-108MHz). In the United States, pagers typically receive signals using the FLEX protocol in the 900MHz band. Commercial paging transmitters typically radiate 1000 watts of effective power, resulting in a much wider coverage area per tower than a mobile phone transmitter, which typically radiates in the neighborhood of 0.6 Watt per channel. Later pagers used digital messages, first numeric and later alphanumeric, to provide the recipient with more rmation. In the United States, pagers typically receive signals using the FLEX protocol in the 900MHz band. Since a one-way pager is a passive receiver only (it sends no rmation back to the base station), its location cannot be tracked. Some early models included an analog audio receiver and speaker; upon receiving a page the speaker would activate, and the user would hear a human voice reciting their message. For this reason, older forms of message submission retain their usefulness for disseminating highly-important alerts to users such as emergency services personnel. Although 900MHz FLEX paging works tend to have stronger in-building coverage than mobile phone works, mercial paging service providers will work with large institutions to install repeater equipment in the event that service is not available in needed areas of the subscribing institution's buildings. Pager technology is now used in irrigation control systems and for traffic signals. This can result in pager messages being delayed or lost. In the United States, pagers typically receive signals using the FLEX protocol in the 900MHz band. In the United States, pagers typically receive signals using the FLEX protocol in the 900MHz band. Vibrating pager. In the United States, pagers typically receive signals using the FLEX protocol in the 900MHz band. |
