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Older Minitor pagers (both the Minitor I and Minitor II series) have tone reeds or filters that are tuned to a specific audible tone frequency, and must physically be replaced if alert tones are changed. For two-tone sequential paging, there are two reeds, the first tone passes through the first reed, and the second tone passes through the ...
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.
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).
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.).
The UK's NHS was using around 130,000 pagers in 2019, more than one in 10 of the world's pagers, according to the government. More up-to-date figures were not available.
161.175 MHz (for tone/voice only and numeric pagers, probably for the alphanumeric pagers); 466.075 MHz (for tone/voice only, numeric and alphanumeric pagers, using the narrow frequencies of the TACS phone system) In France, POCSAG is operated by E*Message over the AlphaPage network on the 466 MHz frequency: 466.025 MHz; 466.050 MHz; 466.075 MHz
A Minnesota couple has reportedly been sentenced to four years after they locked their children in cages for "their safety." The couple was arrested and charged with 16 counts in June 2023. They ...
Some Motorola pagers could decode four different individual 5-tone signals (see SelCall above). Some fire departments used this feature to implement an individual signal (using the first of the four signals), a station based signal (i.e. paging everyone from one fire station, using the second signal), a region-based signal (i.e., everyone in ...
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