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

To: pheilman_ who wrote (1123)	7/18/2000 11:29:54 PM
From: w molloy	Read Replies (1) \| Respond to of 197606

Power output An indirect way to assess power ouptputs between 'phones is to compare battery life (correcting for type). w.

To: pheilman_ who wrote (1123)	7/19/2000 7:15:18 AM
From: John Walliker	Respond to of 197606

pheilman, A very clear post. As all mobile handsets operate at power levels where purely thermal effects are negligible, the key question is whether or not the 217Hz pulse modulation of GSM can cause physiological effects. It is at least plausible that rf might be demodulated by non-linearities associated with nerve membranes and thereby generate electrical activity in a frequency range where nerve stimulation can occur. However, if this did occur, one would expect to see reports of auditory effects. One particular type of cochlear implant (the House Ear Institute single channel device, now obsolete) relies on such "tissue" demodulation of a carrier frequency, albeit 16kHz rather than 900 or 18/1900 MHz. When such effects occur, there is a threshold below which no response can be detected and then a rapid increase in response with increasing signal level. Another field in which people are exposed to high levels of pulsed rf is magnetic resonance imaging. I have had my head imaged several times for research studies without experiencing adverse sensations, apart from the acoustic noise that these systems make when the gradient fields are switched. To see what is needed to cause overt neural stimulation with electromagnetic fields have a look at the Magstim web site. magstim.com John