Arnaud Kodeck <arnaud.kod...@lakoco.be> wrote:
> At the beginning of a call, the mobile is emitting at full power. Then the > power is decreased over time if reception conditions are good at base > station. > . . . > For GSM 2G 900Mhz Band, the maximum power is 2W (33 dBm) > > For GSM 2G 1800Mhz Band, the maximum power is 1W (30 dBm) > Very interesting! Thanks for the info. Still, I think that means that if you are in a bad location you will need continuous power of 2 W. Therefore with a thermoelectric device if you want to stay connected indefinitely, you would need enough heat to keep producing 2 W continuously. I can imagine a situation like this when someone is caught in the wilderness or trapped in a building in an earthquake. I do not think thermoelectric power conversion efficiency will remain at only 5%. I presume it will be something more like 20% by the time this technology matures. So, to get 2 W electricity you will need ~10 Watts thermal. Perhaps the cell phone cold fusion device could produce 10 W only in an emergency and normally it would produce much less, to keep the handset from getting hot. You might also want a burst of high power when the cell phone is used as a flashlight, with the screen continually at the brightest setting. Again, this might be useful in an emergency. As I said, for someone lost in the woods or trapped in a collapsed building in an earthquake. - Jed
