Thanks for that Vic- but I won't be digging there that deep, just yet :) The other thing that struck me in that report [last line] - is that these ELF frequencies are stated to be well below the hearing threshold.[ for <40Hz] We know that you don't have to hear a sound to be affected by it, Hum or Not- that's why crowd control methods are banned world wide, that use these ELF techniques. So, even though this report is not to my liking, it does highlight exactly how the regulatory system is bamboozled by technical details and. in the process, establishing a bench mark that 'average is OK', 'seeing [hearing] is believing' and numbers can prove anything you want, if you're smart!
On Dec 14, 7:55 pm, Vic <[email protected]> wrote: > Yep, Wind turbines are a different ballgame altogether alright. But > this guy Leventhall debunks all the health issues while looking the > affected people standing in courtroom in the eye. All of this Hum > noise is very, very close to "normal" hearing thresholds. Most people > can actually hear Hum if conditions are right. > > Trev - I made a typo in the AP Tuner frequency calculation that I > explained earlier. Corrected it goes like this: > > The subharmonic frequencies that you see on AP Tuner are dBA. The > reason that "normal" instruments don't pick them up is because of > their very short duration period, only 11-15 microseconds according to > my calculations. AP Tuner is compact and the algorithm is lightning > fast, as you have seen yourself, took me a while to find it I can tell > you. > > Now, once you have sutracted the subharmonic from the nearest harmonic > UP of 50/60 hertz in AP Tuner's dBA-weighting you have to do a dBC- > weighting calculation to get to the REAL noise level. As I stated the > other day, it's about a third of the dBA value added to get to dBC- > weighted value. There are calculators all over the internet for that > purpose, simple calculation. That's it - It needed clarifying ASAP. > > Again, FCC regulates dBC noise emission level at 20dBC in the USA. The > EU regulatory agencies were probably first to include the 20dBC limit > and the USA followed - All you have to do is find references to it. I > gave you guys some probable starting points in earlier posts. > > On Dec 14, 2:29 pm, Trev <[email protected]> wrote: > > > > > > > > > From 'that' report, interesting to see that at the Hum candidate > > 31.5Hz only 5 dB separates the threshold from audible pickup of Wind > > Turbine noise at that frequency. Not much more than a doubling of > > sensitivity to that would make it audible but is considered in the > > report to be not average capability- so "allright then"? > > Now this is for WindTurbines , not hum -where the levels are likely to > > be different across the spectrum and in level, but it highlights to me > > the way the non average are forgotten when it comes to assessing > > impact on the general public at large. > > > Freq Hz 10 12.5 16 20 25 31.5 40 50 63 80 100 125 160 > > 200 > > Level dB 63 62 61 59 57 55 53 50 48 46 44 42 > > 42 39 > > T/hold dB 97 92 88 79 69 60 51 44 38 32 27 22 > > 18 14 > > > In this comparison table, where the difference is positive, that is up > > to about 31.5 > > – 40Hz, the wind turbine sound is not audible to the "average > > person" [my added quotes] . > > The low infrasound frequencies are well below the hearing threshold. > > > On Dec 14, 3:17 pm, Vic <[email protected]> wrote: > > > > What began as cursory glance to check on this guy’s whereabouts spread > > > into following links all over the world. Boy, has this guy been > > > around. As previously stated, just type in his name – See all of this > > > crap pop up from all over associated with the same few like minded > > > people. > > > > Story starts off in 2004-2006 when he was actively AGAINST low- > > > frequency noise as a result of detrimental health effects on the > > > populace in general. Changed his mind during that period and went the > > > opposite way. He’s been all over the world testifying in front of > > > government panels and courtrooms that LF is HARMLESS. According to the > > > good Dr. and his buddy's this stuff that we're experiencing doesn't > > > harm you in any way. Read some of this crap, especially the court > > > appearance in Wisconsin: > > > >http://www.wwnw.org/uploads/home/Geoff%20Leventhall.pdf > > > > Now there’s a switcheroo for ya! > > > > He’s been LF on wind farms mainly, but guess who owns the wind farms? > > > Electricity utility companies.- Hide quoted text - > > > - Show quoted text - -- You received this message because you are subscribed to the Google Groups "Hum Sufferers" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/hum-sufferers?hl=en.
