Subject: EMF-L EM radiation at 300 m. Date: Fri, 25 Jul 1997 155745 -0500 (CDT) From: aphilips@gn.apc.org (Alasdair Philips) To: Multiple recipients of list <emf-l@mail.llion.org> -------------------------------------------------- Dear Yoke The levels are very variable between 10m and 300m from a base-station mast due to ground and other building reflections. They usually sit between about 120dBuV/m and 110dBuV/m and then fall at about 6dBuV/m from then on. Most GSM type base-station transmitters are only 10 to 50 watts, but EU law permits them to be up to 300 watts (most unusual). 120dBuV/m is equivalent to 0.265uW/cm2 and 110dBuV/m to 0.027uW/cm2. I suspect that, in practical reality, it will still enable towers to be placed from about 100m, and for low power city sites (20W transmitters) I suspect from my measurements that it will still allow them to be on roof-tops! The phenomena here has little to do with power levels. It is an INFORMATION problem with the (low power) 217Hz pulses being detected by our bodies and it interfering with biological processes. We are WAY, WAY, WAY, below an actual POWER problem as regards base-stations. The handsets are a different issue, and users are subject to slight thermally heating levels within their heads (this is agreed by the industry). Did you know that the DNA helix during transcription rotates about 1000Hz? That is not far from 4 times the 217Hz (quarter wave antenna effects?). Regards Alasdair Philips Powerwatch Network ================================================================= At 08:36 24/07/97 -0500, Yoke Berry wrote: >Dear all, > Wollongong City Council (NSW, Australia) has recently brought out a draft >interim policy on the siting of telecommunications facilities. > >The section on electromagnetic radiation in the policy states: > >"Facilities subject to this plan should meet the following precautionary >siting requirements: > > Not within 300 metres from any residential dwelling unless annual average > exposure at the nearest residential dwelling is less than 0.2micro W/cm-2. > > Not within 300 metres from any school, child care centre, hospital or aged > care centre." > >Can anyone tell me, from actual measurement data ,: >- what your highest and lowest measurements were at a 300 > metre radius from a mobile phone tower (analogue and digital), >- what were these values when two carriers were located on the one tower, >- and does anyone have values for these measurements for multiple carriers on > the one tower ? > >Your input would be greatly appreciated ! >Kind regards, >Yoke Berry > > > > Alasdair Philips (aphilips@gn.apc.org) Archive provided courtesy of WaveGuide, http://www.wave-guide.org Reprinted with permission of Roy Beavers, http://www.feb.se/EMF-L/EMF-L.html