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The Telecom Digest for July 01, 2011
Volume 30 : Issue 161 : "text" Format
Messages in this Issue:
Trials of 'super WiFi' to begin in Cambridge(John Mayson)
Re: Battery power support today(AES)
Re: Battery power support today(AES)

====== 29 years of TELECOM Digest -- Founded August 21, 1981 ======

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Date: Wed, 29 Jun 2011 13:56:33 -0500 (CDT) From: John Mayson <john@mayson.us> To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org. Subject: Trials of 'super WiFi' to begin in Cambridge Message-ID: <alpine.GSO.2.00.1106291355250.2523@nyx3.nyx.net> http://www.dailymail.co.uk/sciencetech/article-2009187/Trials-super-WiFi-uses-white-space-TV-channels-begin-Cambridge.html "Trials of a new breed of 'super WiFi' that uses the white space between TV channels are set to begin in Cambridge. Microsoft, the BBC, BSkyB and BT are among the tech giants investigating how the gaps in frequencies between TV broadcasts can be used to transmit broadband." -- John Mayson <john@mayson.us> Austin, Texas, USA
Date: Wed, 29 Jun 2011 12:23:18 -0700 From: AES <siegman@stanford.edu> To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org. Subject: Re: Battery power support today Message-ID: <siegman-D89C20.12231829062011@bmedcfsc-srv02.tufts.ad.tufts.edu> In article <BANLkTikg3_jasxgAbPLuJ5WqtABxNZVHKg@mail.gmail.com>, Bruce Bergman <brucebergman@gmail.com> wrote: > You can walk around under an AM Broadcast antenna holding a fluorescent > light bulb that's glowing in the RF field, especially at a 50KW Clear > Channel blowtorch like KFI. Could you give your take on how this relates to currently on-going and often very fervid debates over the (alleged) health hazards for people and especially children caused by the r-f fields from cell towers in residential neighborhoods, in church steeples, in close proximity to schools, and so on? Speaking for myself, based on my own technical and physical (though not explicitly medical or biological) knowledge, I'm pretty damn sure that cell phones simply do not ญญ and in fact physically can not ญญ cause brain cancers, no matter how long you hold one against your skull. I'd also be pretty confident the r-f fields associated with any standard telecom or computer devices or installations that you'll encounter in everyday life are extremely unlikely (or in fact unable) to cause any kind of negative health effects, even after prolonged exposure. But that said, would you yourself want to linger for very long "under an AM Broadcast antenna holding a fluorescent light bulb that's glowing in the RF field" as you describe above? Are there published standards for acceptable rf field levels for humans working in close proximity to high-power broadcast antennas? What's the field intensity in that situation, compared to living next door to a cell tower with 8 or 10 or even 20 antennas on it? Do the r-f intensities in your "glowing fluorescent" situation approach levels where nonlinear effects, over and above just simple heating, may start to appear in human flesh? And how does this all relate to cataract formation or visual clouding effects associated with eyeball exposure to low-level microwave radiation? -- Effects which I take it are well document[ed] to occur, leading to stringent standards for microwave oven leakage. Can r-f fields down in the few hundred MHz range cause similar visual damage? Do normal telecom or WiFi/WiMax signals in the 1 to 2 Ghz range pose threats comparable to a leaky microwave oven. Informed posts from informed people on this group would be very valuable. (If one goes to Google looking for such information, one can rapidly encounter a large amount of very scary (mis?)information on these topics). ***** Moderator's Note ***** The reason Google - and every other source of information - is jammed with scary information is that fear is a lot easier to generate than electricity, and often leads to large research grants and/or speaking fees for the academics who spread the rumors. The effects of ionizing radiation on humans have been known and documented for decades. Bill Horne Moderator
Date: Wed, 29 Jun 2011 12:27:55 -0700 From: AES <siegman@stanford.edu> To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org. Subject: Re: Battery power support today Message-ID: <siegman-633426.12275529062011@bmedcfsc-srv02.tufts.ad.tufts.edu> In article <BANLkTikg3_jasxgAbPLuJ5WqtABxNZVHKg@mail.gmail.com>, Bruce Bergman <brucebergman@gmail.com> wrote: > And as someone already pointed out, they don't make chains stout enough to > lock up an unattended portable generator in some areas - or they'll cut the > generator chassis and leave the chain... Heck, some of the permanent > pedestal mounted ones may get stolen unless the pedestals are alarmed and a > LEO can respond to the alarm in time. My wife's idea of a Honda gas-power lawnmower, plus a Honda-provided option of a small portable generator that can be dropped on the top of it, is sounding better all the time!
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