At 01:59 AM 12/11/06, you wrote:
>This thread seems to be setting in early, this year. Usually it's
>much closer to Dayton time. heh.
Well, at least the current round is event driven, not the annual
reappearance of a yet another TowerTalk urban legend.
The FCC does have an NPRM that is open for public comment at present.
>To which I will append....how is it that nobody addresses the multi-megawatt
>ERP's at SHF frequencies? It's well known that there are regular bird
>deaths from exposure to TV emissions on the Empire State
>Building. Or, at least
>there used to be, the summer I was a transmitter tech.
Gee, there's broadcast TV at SHF? ;-)
Tall, lighted buildings are "well know" to kill migrating birds all
by themselves, TV transmitters not required. And tall buildings are
also up there on the environmentalist's agenda.
http://www.ci.chi.il.us/Environment/BirdMigration/sub/lights_out_chicago.html>
But there are many more buildings than towers, with much more
invested in then, and they aren't all regulated by a single federal
agency. Towers are the easier target even if they kill fewer birds.
>I must say that Bob's indication that the estimated losses are 40-50Million
>annually, makes more sense, as compared with the reported NFWS 4-50M. The
>latter must be a typo.
Nope, not a typo. To quote the NPRM:
"The agency [FWS] estimates that collisions with communications
towers are responsible for at least 4 to 5 million bird deaths per
year, and that if a proper cumulative impact study were conducted it
might indicate the number to be closer to 50 million per year."
>On the other hand, I think there's a lot of extrapolation going on.
Oh yeah.... a whole lot
>I repeat my personal observation, echoed by cell phone techs who are
>hams: I have not seen piles of birds around cell sites.
Typically, cell towers are "short" towers, unlit and without guys.
It's the multi-hundred foot, illuminated and guyed towers that are
being accused by the FWS and others of killing all those birds.
73,
Mike K1MK
Michael Keane K1MK
k1mk@alum.mit.edu
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