COMPLETELY BIASED response
Well.....you asked......
http://forums.sohc4.net/index.php?topic=44414.0I like this quote: I have a rock which as kept me tiger free for my whole life. I challenge anyone to dispute this.
There are a TON of University tests, and a few Govt. tests that have been done and everything seems to reach the same conclusion.
The deer can't hear the KHz of the whistles. They just can't , you might piss off a cat or a monkey
"the whistles typically produce a signal either at a frequency of 3 kilohertz (kHz) or 12 kHz. Both, as it turns out, are problematic.
The hearing range of white-tailed deer, the most common species in the United States, is between 2 kHz and 6 kHz, so the animal is not capable of hearing the 12 kHz signal."
http://www.ibmwr.org/otech/deerw.htmlThis guy looks like a doof, but read it any way
http://advance.uconn.edu/2002/021118/02111812.htmWkpedia
"Deer Whistle
The deer whistle is the most widely studied and scrutinized form of deer-vehicle collision prevention method. Deer whistles are products that attach to a vehicle and act as an alarm system for deer and other wildlife. The manufacturing of deer whistle products has emerged into a multi million-dollar industry. [14] As manufactures advertise, the ultrasonic sound emitted as air passes through whistle emits a sound that deer can hear but humans cannot. [15] Most deer whistles are about 2 inches long and appear to be bullet shaped. Most deer whistle products are prescribed to be attached to the bumper of a vehicle. Most deer whistles are sold between $20-$25 dollars. When a vehicle moves faster than 35 mph, a whistle sound is induced which is believed to ward off animals from a roadway. The deer whistle is marketed to prevent deer-vehicle collisions. [16] The effectiveness of deer whistles is disputed among agencies because of the conflicting reports available. The study and documentation of deer whistles is generally poor, and a conclusive decision about the effectiveness of the deer whistle cannot be made. [17]
Some research has been published about the function and capability of deer whistles. Deer have an auditory range of two to six kilohertz(kHz), but only a select few deer whistle products have ranges within that of a deer’s. Some manufactures claim that deer can hear the whistle up to a quarter mile away, but no research has solidified that claim. [18] Another point of concern is that the amount of noise from a vehicle may compromise the clarity of the deer whistle. Because the whistle is vehicle mounted there is little that can be done about mitigating vehicle noise. Others also argue the whistle’s location on the vehicle as being susceptible to dirt and insects. Such debris would eventually clog the passageway of the whistle, rendering it useless to the driver. The idea of a non-air-activated whistle has been discussed but little research has been done on the effectiveness of such products, and is highly recommended. Deer whistles generally have a questionable level of effectiveness but are advertised as aiding in the prevention of DVCs. A concern amongst studies is the impact the whistle has on the psyche of the driver, and the driver’s sense of security"
From what I have researched, the 12 volt. ones don't work either.
One of their testimonials.
"Without the unit switched on, the deer in the fields ignore the sound of the bike and continue eating and moving around. When I switch the unit on, the deer stop grazing and moving around and stand at alert with their heads up and watch me until I'm well past them."
Just what I don't want........to wake them out of their relaxed state of grazing
http://www.xp3hornet.com/testimon.shtmlOK I'm a smidgen BIASED on this topic. Any investors out there?
Mine has nothing to do with the deer. Lets face it they have been running across the road for 100 years and nothing is going to stop them.
But there is a way to stop many of the accidents at under $20.00 per car or bike.....................
Kangaroos and moose are included
