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Technology Stocks : Qualcomm Moderated Thread - please read rules before posting -- Ignore unavailable to you. Want to Upgrade?

To: JohnG who wrote (1110)	7/18/2000 6:33:16 PM
From: rvgent	Read Replies (1) \| Respond to of 197563

a few minutes of searching on the wonderful web.. -- snippet from wave-guide.org You need to look at the actual SAR's (in table for 0.25W antenna power) NOT the scaled 0.6W power column because GSM phones emit a maximum pulse power of 2 W but with an 8:1 duty cycle so that the average power is only 0.25 W. this site also has numbers for a whole lot of non-cdma phones. -- snippet from tassie.net.au this website, in a black and white world would be considered anti-mobile phones.. In fact, up to 80% of the transmitted power can be absorbed by the user's head, which means that their brain cells are being “hit” by these radiation pulses two hundred and seventeen times every second. In addition, GSM digital phones and the new DECT cordless phones also both put high levels (several microtesla) of low frequency magnetic fields into the user’s head. These may be more responsible for the dementia (memory) effects than the pulsed microwaves. The newer American Code Domain Multiple Access (CDMA) system works differently and doesn't emit the sharp-edged low frequency magnetic pulses. The digital RF signal more resembles a noisy analogue signal and is also likely to be less bio-active.There is increasing pressure for Europe to replace the TDMA GSM system with a “third generation” CDMA system within the next ten years. -- a paper . MV Vasquez, CJ Clancy et al: Genotoxicity of radio frequency radiation fields generated from analog, TDMA, CDMA and PCS in human blood cells evaluated using single gel (SCG) electrophoresis and the cytochalasin B micronucleus assay. Environ Molec Mutagen 33 (Suppl. 30):66, 1999. -- something unrelated of interest.. wonder what happened to them internettelephony.com Smart antenna system The SpotLight 2000 dual-mode smart antenna system is for CDMA and analog networks. It works with an operator's existing base station to increase CDMA and analog capacity. The system integrates a multibeam antenna array, spectrum management software and hardware, a load-sharing suite of multicarrier CDMA/AMPS power amplifiers and a PC-based configuration tool. A sector synthesis feature lets operators remotely adjust CDMA sector configurations--including sector beamwidth and azimuth--using a software interface. SpotLight 2000 allows operators to configure different CDMA and analog sector patterns through the same antenna array. Metawave Communications Corp. -- another interesting site perhaps software radios will enable a GSM/TDMA/CDMA phone? sds.lcs.mit.edu