Thanks Supporters for the emails that are coming in!!!
<send to type @ uwm.edu >
If we can get a 100 or more signatures, it will make a powerful
statement at the public meeting this Thursday. The letter will be
asking the powerline developer-- 18 months before their application
goes in to the State-- to fund an independent study on animal
communication impacts near high voltage transmission lines as part of
their application. If they turn this down, its a win.
Please include a description of yourself indicating the number of
years experience you have in recording natural sounds.
The Committee will take my letter up to this Thursday 3:30 pm CST
Many thanks, Rob D.
=3D =3D
At 10:02 AM -0500 3/16/11, Rob Danielson wrote:
>
>
>Hi--
>The transmission companies in the US are allowed do their own studies
>that say these utltra high voltage power lines are harmless and, in
>fact, are a benefit to the environments they pass through. This needs
>responses from many perspectives.
>
>Yes, bird strikes are a huge negative impact. About 200 dead birds
>per mile is typical. I've got material on that thanks to the State of
>CA.
>
>I've not come across any animal communication studies that address
>transmission lines. Imagine it this way: 6- 1" diameter cables
>sweeping through 30 miles, 110-180 feet above marshlands, wetlands,
>grasslands, river bottoms, transition and mature wooded areas. Under
>these wires is a 150' wide clear-cut path that is sprayed with
>herbicide 2-3 times a year in wooded areas.
>
>Under dry conditions which are _much quieter_ than in high humidity
>and circa freezing conditions, the wires create, 24/7, a dense sheen
>of harmonic frequencies starting at 7 K Hz extending to 80 KHz or
>higher (I've read they use ultra-sonic detectors to confirm that its
>working correctly). The spikes are -8dB from the loudest element in
>the natural setting-- distant traffic. I'd have to check, but I'd
>guess that distant bird communications are typically -12 to -18dB
>under the ambient background sound level. If these numbers are even
>close, transmission mission noise creates significant masking of
>animal communication -- especially around 11K Hz. How far from the
>lines would masking happen? Using
><http://www.sengpielaudio.com/calculator-air.htm>http://www.sengpielaudio.=
com/calculator-air.htm
>
>I get about 6dB loss
>per 100 feet. So assuming an additional drop in the noise of -12 db
>(-20 db total under background ambience) would still mask
>communications, we get 150' + 200' or 350 feet on both sides of the
>cables at 11 K hz. 700 feet =3D a 1/6 mile wide compromised
>communication strip from horizon to horizon.
>
>You tell me, would nesting couples that communicate in this range
>keep moving? The location I'm addressing is rare habitat but the
>whole area where the 210 mile long line would run is important
>habitat.
>
>As for determining "public necessity" for the double circuit 345Kv
>line, our studies suggest so far that the high capacity project is
>not needed. Electric use is down in Wisconsin-- as it is all over the
>US except in states where air conditioning is a major use. More
>here: <http://tinyurl.com/622za3r>http://tinyurl.com/622za3r
>
>=3D=3D DO YOU SUPPORT THIS POSITION ???=3D=3D
>
>If folks who have experience with spectrograms for birds can go
>through the list and mark species they know have rich Hz content from
>8-20K Hz on this spread sheet,
>
><<http://tinyurl.com/4jjcgkz>http://tinyurl.com/4jjcgkz><http://tinyurl.co=
m/4jjcgkz>http://tinyurl.com/4jjcgkz
>
>
>that would really help the case I'd like to start developing. Add bat
>and other species at the end and return it to me. Thanks!
>
>If you want to sign a request that the company needs fund a third
>study of potential animal communications and disturbing nesting
>habits, send me an email < <type%40uwm.edu> > The
>request has to go in by
>3pm today.
>
>Rob
>=3D =3D =3D
>
>At 12:21 PM +0000 3/16/11, neuroCO.UK wrote:
>>Hi Tom, I particularly look forward to that recording
> >Regards
>>
>>--------------------------------------------------
>>From: "Tom Williams" <<pterodaktyl%40gmail.com>=
om>
>>Sent: Wednesday, March 16, 2011 12:16 PM
>>To:
>><<naturerecordists%40yahoogroups.com>=
com>
>>Cc: "vickipowys"
>><<vickipowys%40skymesh.com.au>>
>>Subject: Re: [Nature Recordists] Transmission Line Noise & Animal Talk
>>
>>> Hi Vicki, Rob,
>>>
>>> Apologies, this clip wasn't originally recorded with analysis in mind
>>> hence
>>> the low sampling rate. I might be in that area again at the weekend, i=
f so
>>> I'll try and get another recording with my AT4022s at 96kHz.
>>>
>>> Cheers,
>>>
>>> Tom
>>>
>>> On 15 March 2011 20:25, vickipowys
>>><<vickipowys%40skymesh.com.au>>
>>>wrote:
>>>
>>>>
>>>>
>>>> Rob,
>>>>
>>>> I downloaded this WAV sound clip but it is only 44.1 / 24 bit. Needs
>>>> a higher recording bit rate to show higher frequencies on a sonogram.
>>>>
>>>> cheers,
>>>>
>>>> Vicki
>>>>
>>>> On 16/03/2011, at 3:05 AM, Rob Danielson wrote in part:
>> >>
>>>>
>>>> > Here is a soundfile clip
>>>><http://tinyurl.com/4f6b3ar>http://tinyurl.com/4f6b3ar (orig, only
>>>> > boosted +12dB)
>>>> > & sonogram <http://tinyurl.com/464ufe3>http://tinyurl.com/464ufe3
>>>> >
>>>> > Here's what I could use quick help with if people hav some time:
>>>> > (1) a sonogram of the above sample that goes higher than 24K Hz
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
>>> ------------------------------------
>>>
>>> "While a picture is worth a thousand words, a
>>> sound is worth a thousand pictures." R. Murray Schafer via Bernie Krau=
se.
>>>
>>> Yahoo! Groups Links
>>>
>>>
>>>
>>>
>>>
>>> __________ Information from ESET NOD32 Antivirus, version of virus
>>> signature database 5957 (20110316) __________
>>>
>>> The message was checked by ESET NOD32 Antivirus.
>>>
>>> <http://www.eset.com>http://www.eset.com
>>>
>>>
>>>
>>
>>__________ Information from ESET NOD32 Antivirus, version of virus
>>signature database 5957 (20110316) __________
>>
>>The message was checked by ESET NOD32 Antivirus.
>>
>><http://www.eset.com>http://www.eset.com
>>
>>
>>
>>
>>
>>------------------------------------
>>
>>"While a picture is worth a thousand words, a
>>sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
>>
>>Yahoo! Groups Links
>>
>>
>>
>
>--
>
>
>
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