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When the unit is activated, the pager sounds a tone alert, followed by an announcement from a dispatcher alerting the user of a situation. After activation, the pager remains in monitor mode much like a scanner , and monitors transmissions on that channel until the unit is reset back into selective call mode either manually, or automatically ...
The standard fire alarm sound used in most of North America. Coding refers to the pattern or tones a notification appliance sounds in and is controlled either by the panel or by setting jumpers or DIP switches on the notification appliances. The majority of audible notification appliances installed prior to 1996 produced a steady sound for ...
It would only sound when a correct pair of tones were broadcast - allowing many agencies (with different tones) to share the same frequency. Some Plectron Models had a set of "Built-in Re-chargeable Batteries", making the Plectron Portable. The Motorola MINITOR pager also uses this function and has largely replaced the Plectron.
A short piece of fire hose, usually 10 to 20 feet (6.1 m) long, of large diameter, greater than 2.5 inches (64 mm) and as large as 6 inches (150 mm), used to move water from a fire hydrant to the fire engine, when the fire apparatus is parked close to the hydrant. Solid stream A fire-fighting water stream emitted from a smooth-bore nozzle.
Pb II tone & voice radio for 2-tone signalling systems 68–88 MHz / 146–174 MHz (US). Pb II A04FNC Series radio pager 450–512 MHz (Eur). Pb II MAA04FNC1568AA 440–470 MHz für Funftonfolge-Rufsysteme (Eur). Pb II radio pager H04BNC Series 406–420 MHz, 450–470 MHz (US and Eur).
Tone-enabled features like call waiting and three-way calling signalled the beginning of the end for the slow, clumsy, rotary dialing system, which had ruled since 1919. ... Pagers. 1949-1998 The ...
Pagers pre-date mobile phones, having been widely used in the 1980s and 1990s. They are a one-way communications device, allowing people to send a short message via radio signal to the pager ...
The use of flashing lights and sirens is colloquially known as blues and twos, which refers to the blue lights and the two-tone siren once commonplace (although most sirens now use a range of tones). In the UK, only blue lights are used to denote emergency vehicles (although other colours may be used as sidelights, stop indicators, etc.).
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