TDMA (time division multiple access) cell phones share a frequency channel by transmitting only in certain time slots. The power is pulsed on and off even though the modulation mode may be constant-power.
Al N1AL On Thu, 2011-05-26 at 15:19 -0500, Tony Estep wrote: > On Thu, May 26, 2011 at 12:56 PM, Jim Brown <[email protected]>wrote: > > > ...a cell phone used by the person wearing pacemaker -- worst case, it's a > > 1 watt > > PEP AM UHF, transmitter... > > > This is interesting. I thought cellphones used an ADC to convert your audio, > then some sort of FSK to transmit it. A web search turned up references to > NFM used by early analog cellphones, but nothing about AM. Can somebody > point me to a relevant link? > > Tony KT0NY > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
