Re: Radar detectors?
The 3 mile range is a line of sight measurement. If the RADAR was activated 3 miles ahead of you, there were no obstrructions, a perfectly flat ground with no dips or hills at all, then it will work for 3 miles. Any low spot in the road and any other things along the road will deflect and break up the signal before 3 miles. <br />Even the detectors that supposedly detect instant on are worthless in a lot of areas. In this state we don't use instant on. We just keep our RADAR unit turned on, but de-activate the antenna. When a car comes into view we have to first estimate the speed. This is to help verify our RADAR is working properly. The RADAR reading has to be within 10mph of our estimate. We then activbate the antenna for about 1 second max. If the reading shows the car is speeding we leave it on. This is so we listen to an audio tone that identifies the target we are clocking for certain. If the car is not speeding we will shut the RADAR antenna off within 1 to 1 1/5 seconds. By the time the radio wave emitted travels out and is picked up by the detector, we have shut it off. So you will get a quick beep on your detector if it even picks it up.<br />If you do get one, don't watse money with the high dollar "top of the line", but also don't buy the cheapest. Get an in between model, it will be fine. <br />I won't say they are worthless, mine has more than paid for itself. But they are NOT 100%.<br />I almost forgot to say, the nature of the detector is that it has to encounter a RADAR signal to activate. if it has deteted a signal, then the signal has detected your car. By the time it goes off on your car, your clocked. It takes less than a second to turn the system active and lock a speed. It takes the average person focused on their driving has a 1 3/4 second perception time. This is the time from when the machine goes beep to the time your brain tells your foot to move. The average focused sobor driver has an average reaction time of .75 seconds. This is the time it takes to move foot to brake. In that time your caught.