View Single Post
  #1   Report Post  
Old August 10th 08, 02:20 AM posted to rec.radio.amateur.antenna
John Smith John Smith is offline
external usenet poster
 
First recorded activity by RadioBanter: Nov 2006
Posts: 2,915
Default Blackberry power level 4.9GHz

John Smith wrote:
You wrote:

...
Now all you need to prove, is that the RF Power Density of a 300
Milliwatt Cellphone, operating one one of 4 Bands in the 800-900
...


Let's say just those figures are correct ...

My Motorola Razar V3 phone is approx. 6mm thick (when opened), and where
the antenna is buried in the phone. This means the antenna can be no
more than 6mm from my head if the phone lies against my head. Now, we
assume the phone is emitting 300mw. This would be equivalent to 1.2w of
power emanating from that same antenna at a distance of 12mm from my
head. And, the latter would be equivalent to 4.8w emanating from the
same antenna at a distance of 24mm from my head. And, the last would be
equivalent to 19.2w emanating from the same antenna at a distance of
48mm from my head ... your higher figure, of two watts, is simply
frightening ...

The lunacy is exposed ... correct any error you see in the above ...

Regards,
JS


I should have clarified "the meaning" in the above ...

Or, to summarize, 300mw sounds both UNGODLY and IRRESPONSIBLE, IMHO ...
I would suspect it to be much nearer 50-100mw ... and I can logic this
by the size of the battery and the time it lasts between charges. (no,
I have NOT taken the time to get the battery specs and do the computations!)

However, doing the math, 50mw is too much. And, an equivalent of 1kw
emanating from the antenna comes at MUCH TOO CLOSE a distance ...

Sorry I had to take two posts to make that clear.

Regards,
JS