Radar Detectors...which one?

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World's Best Radar Detector Comparo

Winner: Escort 8500 (over Valentine One by a lot!)
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How Radar Works

About Radar
by Craig Peterson

A police radar gun operates by transmitting radio waves at certain frequencies. A portion of the beam reflects from the target vehicle and returns to the radar. If the target is moving, a measurable change in frequency occurs (Doppler shift). The radar converts this shift into miles per hour and determines target speed.

Except for the earliest units, X-band (10.525 Gigahertz) was the only frequency used for police radar until the mid-1970s. K-band (24.150 GHz) arrived in 1976 and Ka band (33.4 - 36.0 GHz) appeared in 1989. At present about 20 percent of the 100,000-odd radar in service nationwide use X band, 60 percent use K band and 20 percent operate on Ka band. Those percentages are shifting rapidly; today the majority of new radar entering service are Ka- band and X band is fast disappearing except in a few holdout states like Ohio and New Jersey whose state patrols invested heavily in X band radar years ago and are loathe to change. But everywhere else there's a wholesale move toward Ka band.

Two types of radar are used--stationary and moving. Stationary radar must be used from a static site, typically a patrol car or motorcycle parked alongside the road. (Photo radar, an automated system that combines K- or Ka-band radar with a camera, also is stationary-only but with only about 20 in use nationally, you're as likely to be hit by lightning as to be bagged by one.) With moving radar an officer can clock approaching vehicles while driving on patrol. If the radar was dual antennae--one facing forward, the other aimed rearward--targets in the opposite lanes can also be clocked after they've passed by the cruiser.

Newer radar models have two unique features, Same Lane and Fastest Speed. Both are very bad news. A dual-antenna moving radar with Same Lane can clock vehicles ahead of or behind the rolling cruiser. But it cannot do so if any vehicles are between you and the patrol car or if any vehicles faster than yours are within the radar's range, which is often a mile or more. So if you're paying attention, a trolling cruiser is unlikely to get close enough to employ Same Lane without being spotted, particularly if he fires at other targets before reaching you and trips your detector.

Fastest Speed is more of a problem since it allows the radar to sample multiple targets and display the speed of the fastest. With this feature an officer can clock a motorcycle passing an eighteen-wheeler, meaning you'll no longer be able to hide behind slower vehicles.

Although we've used radar capable of clocking large vehicles at four miles, the useful range of any radar is restricted to no more than a quarter mile and more often, less than 700 feet, at least if the officer is following the rules. That's because before using any type of speed-measuring hardware to check speeds, by law the officer must first witness the violation--speed in this case--and visually estimate the target's speed. Only then can he activate his radar to confirm that estimate. Many times an alert driver with a radar detector is more than a match for radar.
 
How Laser Works

About Lasers
by Craig Peterson

Laser speed guns transmit short bursts of invisible light which bounce off a target vehicle and return to the laser gun. By timing the outgoing and return trips of the light bursts, it can compute the target's speed. The laser's biggest selling point is its narrow beam--only about three feet wide at a 1,000 feet--a feature that provides nearly foolproof target identification. (In comparison, a radar's beam is about 250 feet wide at 1,000 feet.) Laser guns must be used from a stationary position and are most effective at short range, usually targeting traffic at 700 feet or less.

Since laser guns use a specific light frequency, it is possible to detect a laser's signature light pulses. Keep in mind that laser detection is very different than microwave radar detection.
radarbeamwidth.jpg

Since the narrow laser beam generates very little scatter--random bits of electromagnetic energy bouncing down the road--it is much tougher to detect than a radar gun that blankets the countryside with its powerful, easily detectable microwave beam.

Although we've tested laser guns capable of clocking a mid-sized sedan beyond 4,000 feet and 18-wheelers over a mile away, practical range is limited by the officer's ability to first visually estimate the target's speed. Like radar case law, that first step is required before the officer can use the device to confirm his estimate. And while any experienced traffic officer can visually estimate speeds with an accuracy tolerance of plus or minus three MPH, that task is nigh impossible at ranges much beyond 1,000 feet, especially when the vehicle is approaching dead-on, as it must be for the laser--or radar guns too, for that matter--to accurately measure speeds.

Laser guns operate exclusively in instant-on mode, not transmitting until the trigger is squeezed. For this reason a detector usually will offer little advance warning. Similar to instant-on radar, if you're the target there will be little time to slow down. Your best hope is to use a laser detector with high sensitivity and a good field of view--the crucial ability to sniff out off-angle laser beams. So equipped, there's a fair chance for advance warning of a laser working traffic up ahead.

Forget about so-called 360-degree laser coverage; visualize a line running axially down your vehicle's centerline and expect an incoming laser beam to be no more than a few degrees off to either side. The devices become inaccurate at greater angles and cease working entirely beyond about 40 degrees off-center. While in theory these detectors can spot a laser beam coming from behind, we've found that a direct hit must be scored on the detector for an alert to sound. At that point you can forget about spiking the brakes; you're toast. Fortunately, nearly all laser ambushes will be coming from the front. Laser jamming is easily done and legal in most states as well.
 
Here is what V1 has to say about RADARTEST.COM

"Craig Peterson's December [1995] radar detector comparison test generated more angry letters--and on-line discussion--than anything since the Davis Ferrari/raccoon incident." -- Automobile, March, 1996

The V1 Hater...same old story one more time.

Craig Peterson's detector test in Automobile (February 2001) is completely predictable; he has made a career of denigrating V1, starting in March, 1993, in Car Audio and Electronics when he knocked it for having "dual antennas." On his website (www.radartest.com) he says he "distrusts" the bogey counter and wants warning on radar only when it's "up ahead." Which makes him the only tester on the planet who thinks the Radar Locator is a bad idea.

V1 operates with a single control knob and concentric lever, just like the volume-and-tone-controls of the traditional American car radio. He hates that too. As another magazine editor told us, V1 "is a box with one knob. What's his problem?"

He ignores V1's features

V1 is the only detector with fully automatic illumination day and night. So it doesn't get credit in his Features chart for having a stone-age manual dimmer. It doesn't get credit for being programmable either, and for having band defeat. For the record, it has both. But these features intentionally have a low profile because--call me crazy--I think very few customers will have their lives made better by downgrading their detector's performance.

He gets measurements wrong

But instead of debating philosophy, let's look at his record on simple facts. Peterson opens his website review of V1 by saying it is "by far the largest and heaviest unit tested..."

On our scale, Passport is heaviest at 8.9 ounces followed by V1 at 8.6 and the BEL at 8.0. Only V1 has a metal case (magnesium), the others are plastic.

Passport is also the longest by a huge margin at 5.29 inches, followed by the BEL at 4.72 inches. V1 is shortest at 4.46 inches, more than a quarter inch shorter than the BEL and nearly an inch shorter than Passport.

In thickness, all are within 0.1 of an inch (V1 is thickest). Only in width is V1 significantly larger than the others, but the difference between them is less than the difference in length.

If he can't get a simple comparison of dimensions right, imagine the reliability of his performance testing. His results are contrary to what I measure in my own lab. How does he test? For example, where does he locate his microphone to measure audio volume? V1's speaker is on the left, aimed toward the driver when mounted in the normal location. BEL speaks away from the driver toward the passenger side, Passport speaks toward the ceiling. I think users will agree V1 is more audible in the recommended mounting locations.

His range tests raise questions about his methods

In the Automobile straightaway/hill test, notice how his results mostly fall into four narrow clusters at 23, 27, 31, and 40. In fact, only three bars are not in those clusters. Look closely. Four of five detectors have the same K-band range. Seven different X-band tests have the same distance of 31; two detectors get exactly the same results for both City and Highway modes (why have both modes if they perform the same?).

Similar clusters occur in his curve test.

Such clustering is what you get when the ups and downs of terrain bring all detectors into line of sight with the radar at a few discrete places on the test course. For a discussion of common testing mistakes, check Radar Detector Tests.

The man behind the byline

Rather than trying to explain Peterson's mysterious results, let me just remind you that his credibility has long been in question. In response to his December, 1995, test, Automobile admitted a flood of "angry letters" which "criticized our selection of the BEL 745Sti Plus as our first-place winner over the Valentine One, which tied for third place. Amidst all the allegations of invalid test methodology and unfairness were suggestions that Peterson showed undue favoritism to the BEL unit because he has consulted for the company."

In the March, 1996, issue, Peterson replied, "Having consulted to every major detector manufacturer, suggestions that BEL received preferential treatment are nonsense."

He's wrong on that point too. He's never been a consultant to Valentine Research, although he's approached us more than once. We declined his advances each time.
 
Anyone interested in some serious protection....try the Phazer II Jamer. It's legal in any state that a radar detector is and I've made out pretty well with it.

The first weekend I made the 200mi drive home from school I blew right through a MD State Police speeding trap with three troopers all set in their cars ready to take on anyone their buddy was shooting with his laser gun. I have a detector as well that alerted me too late to slow down in time, but I was safe thanks to the Phazer. I saw him shoot me TWICE and after the second try, he just lowered his laser gun and looked at it like he thought it was busted...too bad for him the Phazer II works on laser emitters too :D

Here's a link if anyone's interested. It's a great deal, and though it doesn't have any visual/audible alert that it's working, I'm telling you from experience that it's a prize...a work of electrionic art. :artist:

http://www.technoscout.com/general/product/product.asp?product=185
 
Goose said:
Anyone interested in some serious protection....try the Phazer II Jamer. It's legal in any state that a radar detector is and I've made out pretty well with it.

The first weekend I made the 200mi drive home from school I blew right through a MD State Police speeding trap with three troopers all set in their cars ready to take on anyone their buddy was shooting with his laser gun. I have a detector as well that alerted me too late to slow down in time, but I was safe thanks to the Phazer. I saw him shoot me TWICE and after the second try, he just lowered his laser gun and looked at it like he thought it was busted...too bad for him the Phazer II works on laser emitters too :D

Here's a link if anyone's interested. It's a great deal, and though it doesn't have any visual/audible alert that it's working, I'm telling you from experience that it's a prize...a work of electrionic art. :artist:

http://www.technoscout.com/general/product/product.asp?product=185
I'm really sorry to burst your bubble on this but I think you got lucky that day.

From SpeedZones.com"
The drama was short lived as all radar guns immediately clocked the test vehicle containing the RMR jammers. We then ran all RMR jammers against the laser gun. Same result. We ran the RMR jammers a total of sixteen times toward the police operated radar and laser guns. Not a hint of jamming. Then the writer was shown how to operate the radar and laser guns and he aimed them at the RMR jammers approaching the 1,000 foot cone. He saw for himself. Same result. The only "jamming" that took place with RMR jammers was the word "Jammer" on the box.

Rocky Mountain Radar has long been known to be crap and just a con. Legitimate testers like the SpeedZones and Car & Driver test them out yearly to see if the maker and long time con artist has actually produced a product that works. It's the same result yearly, crap.

Sorry.
 
Well, I'd certainly say that's unfortunate. I had read several reviews shown to me by some friends who design control systems like the one in the Phazer...just led astray I suppose. I'll keep a closer eye on this in the future, but thank, even if I do look like the fool, but at least I know of the problem, eh?
 
I think Datline a while back did a story on this company and how questionable the owner's products and sales pitches were. I guess it didn't deter him much.
 
It's all good...end result: no tickets. However, i would recommend getting a good radar detector (V1 or Escort brand). I chose V1. It has performed to expectations...those arrows are so darn useful!

However, just a warning, i did get a ticket with V1 through courtesy of Instant-ON Ka radar detector...damn, that was not fair!:D So, it's not a sure thing either.

Goose said:
Well, I'd certainly say that's unfortunate. I had read several reviews shown to me by some friends who design control systems like the one in the Phazer...just led astray I suppose. I'll keep a closer eye on this in the future, but thank, even if I do look like the fool, but at least I know of the problem, eh?
 

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