> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of solarwind
> Sent: 01 October 2009 17:09
> To: Microcontroller discussion list - Public.
> Subject: Re: [OT] Cell Phones & Cell Damage
> 
> On Thu, Oct 1, 2009 at 11:04 AM, Sean Breheny <shb7@cornell.edu>
wrote:
> > Interesting advice. I do not have a regular phone - only a cell
phone.
> > Therefore, I am particularly concerned about this. My strategy,
since
> > neither I nor most other people I call are big into texting, is to
use
> > headsets and get the phone away from my head, usually on the desk in
> > front of me. I have found, though, that many headsets do not work
all
> > that well. I tried several wired headsets first and they had strange
> > quirks like my phone sometimes deciding to mute the microphone of
the
> > headset for no apparent reason. So, I now use a Bluetooth earpiece -
> > of course that itself is RF but much lower power.
> 
> So, relatively, how much radio energy does a Bluetooth headset output?

Bluetooth RF power depends on classification of the device, the majority
of hands free headsets are class 2.

Class 1 100mW ~100 meter range
Class 2 2.5mW ~10 meter range
Class 3 1mW   ~1 meter range

The range associated with each class is nominal, and depends on
environmental conditions of course.

For comparison the output from a digital cell phone (e.g. GSM) is much
higher, maybe 2 watts maximum.  However, this is reduced as required to
increase battery life, so it will only be running at the highest power
if you are a long way from a cell tower.

Regards

Mike

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