[From EMF Guru posting emfguru.com
We're fighting three Sprint PCS antennas to be placed on top of a jazz club here in San Francisco. Several hospitals and businesses have already rejected the antennas so something positive is beginning to stir in our society. However, on top of this revelation, an interesting piece of news turned up.
David Hammett of Hammett and Edison appeared on behalf of Sprint PCS at a Sprint-sponsored neighborhood meeting last night. He was there to explain the absolute safety of cellular antennas: "five hundred times below the U.S. standard." In the course of questions and answers, Hammett revealed that these new antennas will have an output of 1000 watts as opposed to the more usual installations here in San Francisco of 100 watts.
Although Sprint has achieved virtually total outdoor coverage in San Francisco according to Hammett, Sprint has now upped the ante to provide total indoor coverage as well. Hence the need to radiate at increased power levels. And they have not yet progressed to providing wireless internet and so forth.
According to the Sprint attorney present, some 1.5 million households in the U.S. currently use only wireless telephones in the home. For the sake of this small percentage, the rest of us will face increased exposures from the larger antennas.
Sprint has fifty installations throughout San Francisco and has plans to build fifty more.
Very best,
Christopher Beaver
[Response from abroad with more concise details of realistic transmission increases!]
Chris says 50 sites + 50 more to come to cover most of San Francisco. I am surprised that Sprint is going for a powerful mast, although most operators like a few in any area to provide emergency cover,etc.
In London, because of the large number of phone users, the cellular operating companies decided ages ago that increasing the power of the masts wasn't the answer because each base station can only handle 79 or 127 calls in any one antenna direction. In fact, typical large base-stations over here only handle about 31 or 63 calls in the same direction at any one time. (GSM/PCN systems)
So, instead, they have masses of lower powered base stations. Typical ERP (Effective Radiated Power) in any one direction varies from less than 10 watts for a micro-cell to 100 to 250 W for a macro-cell, although there are higher ERPs, especially in rural cells. The UK allow ERPs up to 1500 W per frequency channel and up to 16 f-channels at 1800 MHz and 10 f-channels at 900 MHz.
All the cellular operators are now saying that they need base-stations about every quarter to a third of a mile in city and urban areas and we have 4 main operators. If they shared all sites (which is opposite to normal practice over here) we would still need about 15 base-stations to the square mile.
The two high band operators are now using lamp-post masts which they locate about every 150 to 250 metres to get adequate indoor coverage. This is about 80 masts to the square mile.
50 + 50 = 100 for all of S.F. ?? I suspect you folks have a shock coming soon. Masts will multiply like you have never seen before (like the N.Y. lamp-post masts). It really is a blue and bluer world that is coming.
Good wishes
Alasdair
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an excellent overview of the current political/scientific
cellular phone situation by B. Blake Levitt, an expert in the field.
BBC News Article
BBC News Article
BBC News Article