Date: 26 Oct 98 02:59:56 From: email@example.com (John Wright) Organization: Janet, me and our cats in our little cottage References: 1 2
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On 12 Oct 98 00:02:43 , in <airliners.1998.1638@ohare.Chicago.COM>, Arthur Leung wrote: >as you mention, activating more than one cell may confuse the >cell switches. however, many private pilots carry a handheld >aviation radio with transmit and receive capability. many of >these units also have a VOR function. these are not high >power units, so their range may be limited, but they probably >have more worldwide coverage than your average cell phone system. My Icom handheld has an output power of 5.0W - and at, say, 10,000 feet I can talk to people at the same height more than 200 miles away. My GSM mobile has a power output of 1 watt - but the real problem with range in GSM is the timing delay - the TDMA scheme mandates a maximum delay which equates to a maximum of about 35km from the nearest base station. At ranges greater than that - over the sea for example - I could receive a signal from a base station but would not be able to use it because of the timing delays. (Other rules may apply for AMPS, D-AMPS, CDMA, ETACS etc. but GSM is the most widely used scheme in the world. -- John Wright "There's spam egg sausage and spam, that's not got _much_ spam in it." "I don't want *any* spam..."