owever, the concept of private subscriber local wide area systems was de- Cityruf scheme 465.97MHz; 466.070MHz; 466.23MHz. veloped early in the 1970's and by 1988 there were more than 600 Private wide area, proposed frequency band 440MHz to 450MHz; radio common units and 40 telephone companies providing services 12.5kHz. to 1.5 million subscribers. 45.3.3 France Frequency allocations 45.3.3.1 On site Frequencies for on site and wide area paging vary from country to country. The following is not exhaustive, but is indicative of the 26.635MHz; 26.695MHz; 26.745MHz. challenge facing the design engineers. 446.475MHz to 446.525MHz. Talkback 152.0125MHz and 445.50MHz. All frequencies are narrow channel (10/12.5kHz). 45.3.1 45.3.1.1 On site 45.3.3.2 Wide area 26.2375MHz to 26.8655MHz. 31.30 MHz. 26.978MHZ to 27.262MHz; 31.725MHz; 31.75MHz; 31.775MHz Pan-European 466.075MHz. Other overlay/emergency services (special allocation). schemes are operating across all the mobile bands. 49.0MHz to 49.4875MHz. 49.425MHz; 49.4375MHz; 49.45MHZ; 49.4625MHz; 49.475MHz (speech permitted). 45.3.4 Holland 161.00MHz to 161.10MHz. Return speech (emergency/special licence only). 45.3.4.1 On site 459.125MHz to 459.45 and 495.475MHz. (Shared with local com- munication systems.) 26.5,26.6, 26.7, 26.8, 26.9MHz. (Low power systems.) 161.0MHz to 161.10 and 161.1125MHz. Return speech. (Shared 26.15MHz to 27.85MHz. (Excluding the above frequencies.) with local communication systems.) 39MHz to 40MHz. 45/4 Radio paging Talkback 156MHz to 174MHz. Overlay and emergency services etc. in the PMR bands at v.h.f. and 450MHz to 470MHz. u.h.f. 138MHz to 174MHz and 410MHz to 470MHz. 45.3.9 USA and Canada 45.3.4.2 Wide area The manner of frequency allocations in these countries is according PTT Semafoon scheme 154.9875MHz and 164.35MHz (Benelux). to end user category, rather than any specific frequency bands. This Emergency services etc. across the mobile bands. means that the whole mobile spectrum is encompassed. To cover both countries, pager manufacturers 