| Author | Message | ||
     Mikej |
Found this posted on another site, not registered so don't know the details, but apparently they recorded a stationary bike as speeding. Comments? http://www.motorcyclenews.com/nav?page=motorcyclenews.articles.articleCategory.a rticle&resourceId=4488721&articleCategory=NEWS_OTHER-NEWS | ||
| Gentleman_jon |
There was a quite complete discussion of handlebars just a few threads down: http://www.badweatherbikers.com/buell/messages/32777/179824.html?1141825564 Having tried the stock bars, the CR Azonic Lows, I finally set on the Laverda Jota bars.  They are almost infinitely adjustable, and cost about $130. | ||
| Ryker77 |
Doppler radar is a sound wave. Sound wave is just like a real water wave. Its possible for the sound wave/beam to miss it target. Called resolution. For example if the beam has a width of 2mm and the item is 1mm then the beam will not hit the item. It will pass it and continue on to another target. Then it will bounce back. If I knew the frequency of the radar used and the range of the bike. I can do the math to determine beam width. --- I'm in school for ultrasound and use doppler to measure blood flow-- same physics applies | ||
| Natexlh1000 |
Doppler radar is radio waves. The term "Doppler" only refers to the effect of frequency shift due to it being bounced off of a moving object. You can use the doppler effect with radio, sound, and light. Laser speed detection also works with the doppler effect. | ||
| Rocketman |
The radar gun that read a stationary bike doing 40mph was an LTI 20.20 Marksman (US model) Rocket | ||
| Cataract2 |
I find it fun to go by those speed readers that tell you your speed and see how it miss reads me. Kinda bothers me at times. | ||
| Chevysolid |
LTI 2020 is not a radar gun but a LIDAR (laser) gun Laser does not use the doppler pinciple... It emites several beams in a split second and measures distance, then the change of the distance in relation to a known amount of time.... ie. distance traveled over a period of time equals speed. A laser emits a very narrow beam, there for it would be more difficult to check a motorcycle because it is a smaller target...same with a low profile vehicle (corvette for example) The reflective surface also can influence the ability to check a vehicle but not the accuracy of the reading... ie a vehicle may not reflect the beam as well... this would not influence the accuracy only the distance in which the vehicle could be detected. | ||
| Rocketman |
Thanks Chevy. I know it wasn't a radar gun but it was the gun that MCN tested with. The 40mph recorded was from a car passing the stationary motorcycle, they claim. MCN UK, for the past several months and more, has protested the accuracy and reported thus, just about every speed detection piece of equipment used on British roads. If MCN's reporting is to be believed, it is always alarming to say the least. I for one believe MCN are doing their best to bring us the truth behind what appears to be revenue generating speed traps. The truth is, most speed trap equipment is not that accurate in the environment and circumstance that the British law enforcement agencies are applying it. My advice to anyone caught speeding in the UK would be to study the evidence very carefully, employ a lawyer, and fight the alleged offense if there's an element of doubt about the speed you were traveling.. Rocket | ||
| Ryker77 |
I thought that the lasar guns were dead on accurate. I do know this -- my car has a passport 8500 radar dector with the SRX lasar shifter. It detects the lasar beam then attempts to confuse the laser device. THIS IS NOT the bogus rockymtn radar crap. Its been tested and proven to work only on laser. Plus I have been using it for over three years now. And numerous times I've had the alarm go off then I drive by the cop as he is looking at his settings, trying to find out whats wrong!! | ||
| Rocketman |
Laser detection can only occur if the laser beam is there. It is only there when it is being fired. If you can detect a laser beam as you pass someone using a laser beam type speed detection device they must be firing at someone in near proximity to you. You could not possibly scramble the laser beam information returned to the detection device unless the beam was pointing directly at you. Here in the UK speed detection is not illegal. It is however illegal to attempt to or scramble the laser signal so as it returns false information to the operator of the device. In the case of the most common used laser detection equipment in the UK, the LT 20.20, which can be in the form of a hand held gun or a laser device that is working side by side with video recording equipment in the back of a (camera) van, if the beam is scrambled by your vehicle being fitted with a jamming device an 'error' message is displayed to the laser operator. In these instances the Home Office have instructed operators to note the registration details of vehicles that return 'error' messages. At the end of a working shift the operator feeds the relevant registration details into a central database where it is flagged. If the vehicle is recorded again in similar circumstance, once that vehicle is flagged twice the police have the power to call upon you and impound the vehicle in question so as to search for laser jamming equipment. If a jammer is found the offense committed is worse than a speeding conviction as you are in effect 'perverting the cause of justice' which is a prisonable offense. A BMW driver was flagged 16 times in a short period in several counties during 2004. The police gained entry to his house by breaking the door down at 6 am. They arrested him and took his car to a police garage near by. Within minutes a Lidatek LE30 laser jammer was found.  I don't know what became of the case because the bloke in question who was using the jammer was challenging it in court. I know if he got off in a Crown Court there was a possibility of a precedent being set, which means the possibility of that particular piece of equipment or similar devices being ruled legal. As I say, I don't know what the outcome of that case was but I'd sure like to know as laser is the speeding device you're always at most risk from. That means I'd like to use a jammer but without fear of prosecution or having my vehicle impounded. Rocket | ||
| Gowindward |
I'm using a Blinder jammer on my bike. | ||
| Lowflyer |
I never speed.  | ||
| Seanp |
Rocket - I wonder if there's a way to mount that laser jammer in a temporary position with velcro or something, so that you could just put it on when you're driving the car. Then if they break down your door in the middle of the night, the laser jammer would be in your kitchen drawer instead of permanently mounted on the car. Not that I would suggest that anyone break the law as such, but it might work... | ||
| Rocketman |
The difficulty in jamming laser is the width of the beam and where it is pointing. We are talking car here, not bike. Laser operators are told to aim for the vehicles number (tag) plate which means the jammer needs to be as near as possible to the plate in order for it to have a good chance of working. This means finding a way to place the jammer right at the front of the car, just behind the grill for example. I suppose this isn't the most convenient of places to place it if it were a removable item. As far as I'm aware the Lidatek is a hard wire unit only, therefore not meant to be removed once installed. I've not looked into any others as the Lidatek is claimed to be the only one worth its salt. Rocket | ||
| Natexlh1000 |
Fun questions for rocketman: Laser and radar only tells you the relative speed right? not the direction or anything else? Here is a scenario for you: Cop is moving at 30 target is moving at 30 but perpendicular to the cop. How would the gun read that? I ask this here since it sounds like you have many brain cells. | ||
| Rocketman |
Police in the UK, as far as I know, only use what is known here as VASCAR for reading speed of other vehicles whilst both vehicles are moving. The police operator simply pushes a button on the VASCAR unit when the lead vehicle passes a certain point that the operator deems 'the' fixed point. The operator then tells the VASCAR unit when he too passes that point in their vehicle by pressing button again. This system is woefully inaccurate and relies entirely upon the jugement of the VASCAR operator, but it stands up in court because the police operator is seen as the professional and an upholder of law, so they wouldn't operate the VASCAR outside of the law knowingly. Laser and radar guns, or camera type equipment are all of a fixed nature. They are fixed at permanent sites or the vehicles they are in are stationary whilst the equipment is in use. In the case of the hand held laser gun, MCN this week proved it requires to be held very very still to give accurate information to its operator. I'm no expert, I've just read plenty on the subject. As far as I'm aware laser and radar don't read relative speed. They read the actual speed (or are supposed to) of the vehicle being targeted the moment the beam has traveled its course. Vehicles traveling perpendicular to the laser or radar trap cannot have their drivers considered for prosecution as the information received by the detection equipment will not be accurate. These devises can't calculate speed in such a manner, and nor can I, LOL. Rocket | ||
| Ryker77 |
"You could not possibly scramble the laser beam information returned to the detection device unless the beam was pointing directly at you." I can't. But I assure you that the Passport zr3does work. It gives you just enough time to slow down. Once your at a close enough distance - the lasar gun will get your speed. Trust me-- I've used this for 4 years. I enjoy watching the cops tap on there lasar gun as I drive by. http://www.radartest.com/article.asp?articleID=100541 http://www.radartest.com/chart.asp?articleid=8503 | ||
| Ryker77 |
Laser operators are told to aim for the vehicles number (tag) plate which means the jammer needs to be as near as possible to the plate in order for it to have a good chance of working. This means finding a way to place the jammer right at the front of the car, just behind the grill for example. Which is why my car has 2 front facing "jammer" and one rear facing "jammer" | ||
| Rocketman |
Jeez Ryker, anyone would think you're a speed demon LOL. Hey, I don't doubt your equipment works but the way laser detection is relied upon to offer the best protection is for your detector to pick up the laser when someone else is targeted. If you're the one being targeted chances are you just got nicked. Jammers are slightly different in the respect that they work when the laser is aimed at them. Rocket | ||
| Chevysolid |
Nate, Radar and laser can only be used in a relative parallel position to the vehicle Coming towards or away from the unit. This is the cosign affect. First, Laser can only be used in a stationary mode, whereas radar can be used in a moving mode b/c the radar reads the cops speed and the offenders speed both. I am not sure if I under stand your question totally but basically the more of an angle the radar./laser has it will actually give a lower speed reading.. For instance if I was offset 45 degrees from the vehicle than I would get a reading of about half of what the actual speed is b/c of the angle of the approach.. If I was at 90 degrees the reading would be zero b/c it would think the vehicle is stationary…b/c the laser relies on distance to measure speed and the distance measured at 90 degrees would be the same To accurately read a vehicle it is recommended not to be more than 5 degrees from the vehicle…. More distance from the vehicle means less of an angle … Does that make sense?? The units can discern whether the vehicles are traveling away from or towards the units….. in fact the laser uses a – sign to show that a vehicle is traveling away from the unit. With radar an audible tone is present to help distinguish the position of the vehicle. The tone sounds different when it is approaching vs. traveling away.. This is the same type of sound when you hear a bike coming towards you and how the sound changes as it passes… |
