|Subject:||Re: [TowerTalk] dead birds|
|Date:||Sat, 23 Aug 2003 02:25:37 +0000|
Without a doubt, "communications towers" didn't kill any birds. It was the flux density of the transmitters...and therefore possibly microwave energy, or something close to it.
I don't think you'd find that much power at that sort of frequency on a tower - especially a big one - in NA, but you guys do have some serious UHF TV transmitter sites, where the lower frequency is more than made up for by much more power & the same sort of proximity is possible.
Don't recall seeing any dead birds at the foot of a tower or along guy runs on any of the towers I've worked on back there, but out here I have seen literally hundreds of gargantuan beetles & other "bugs that time forgot" scattered on the ground at the base of a 120m commercial tower that an acquaintance has put up at his holiday home up in the hills of 9M6.
Not much more than low & high-band VHF & perhaps some UHF two-way stuff on that tower - nothing really significant radiation-wise, if I recall correctly. I would think the lights help attract stuff to the towers & then in the case of birds, differences in towers compared to trees catches them out (like guys). Birds attracted to the bugs suggests birds may hang out near the tower longer, which increases chances of running into a guy (or greater radiation exposure, I must admit). In the case of the bugs in 9M6, it might be that the "attraction" of the tower over surrounding trees means more going for the tower & therefore the possibility of seeing more of those that die as there simply as a result of the higher bug density.
Otherwise, what I've seen is that typical amateur antennas & towers tend
to attract birds, who appear to be the better for the presence of the tower.
I have only some dipoles up at the moment, but from the amount of seeds
& droppings I clean up off the roof, I'm getting more birds here than I did
with all the attractive perches the quad provided to them when I lived out
in the jungle. The experience of others mentioned on this list also tend to
suggest it's very likely that this isn't an issue of concern to amateurs - other
than the possible inclusion of amateurs to anything that might be done to
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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