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| Radar speed guns |
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| Halcyon:
--- Quote from: woodchips on August 01, 2020, 11:40:55 am ---I have a Canadian MUNI-QUIP KG-P radar speed gun, and with the lifting of the lockdown people don't seem to be able to read the speed limits any more. It seems to work, but no instructions. Came with a tuning fork which must be for calibrating the difference frequency for a speed, but how do you use it? Can any one please give me some instructions, and because this will no doubt go to the police some backup documentation would be very nice. I can't find anything on the web. --- End quote --- The tuning forks aren't used for calibration. They are used to check the calibration. Tap the fork on a suitable surface and place it in front of the radar. The oscillation represents a known speed. The radar should read whatever "speed" the fork is, if it doesn't, it needs to be re-calibrated. Some makes/models come with two forks, one for a low speed reading and one for a higher speed. Police here in Australia have made available to the public the document highway patrol used for the Silver Eagle II radars. It includes a section on tuning forks. https://www.police.nsw.gov.au/__data/assets/pdf_file/0006/291516/Silver_Eagle_II_Operation_Manual_06_2013.pdf It's old but most of the content is still very relevant. It's quite comprehensive and if you wanted to join Highway Patrol, this is part of what you needed to learn and know. |
| tom66:
--- Quote from: Zero999 on August 01, 2020, 06:12:19 pm ---One of the nice things about lockdown was less speeding, even though the roads were clear. I suppose drivers were more careful because they didn't want to end up in a COVID infested hospital. --- End quote --- You must not have lived anywhere near me I had someone pass me at >100mph on a NSL 60 and I was already travelling at 60 mph on that road. That happened several times on the few days I had to go into work and it was always a different car... |
| woodchips:
Thank you to Halcyon for the article. Thanks also to all the other replies. Did try putting the fork in front when I got the gun, didn't seem to get any response. I would have assumed there was a place within the actual doppler circuit that turned the frequency into a speed. In fact, looking at it again it is marked 65mph K-band. But looks like a machined lump of aluminium, not the tuning fork as on setting a teleprinter motor. Will have to experiment, also on traffic. It is fairly easy to get a reasonable idea of traffic speed just by looking. Count the number of kerb stones over a distance and count seconds. You know if it is 30mph, slow, or 50mph, quite a bit faster. The idea of every gun having a tuning fork is to allow instant calibration check, and it should be ok in court if the argument is between 30mph and 70mph. The video with the distance traveled in each frame is also a backup. |
| PlainName:
--- Quote ---The video with the distance traveled in each frame is also a backup --- End quote --- Record at 20fps, playback at 25fps. Use a short-focus lens to accentuate the feeling of speed. Bosh. Something nags my mind that you need two sources of reliabel evidence. With a normal speed trap, the (calibrated, checked that shift) camera is one and the opinion of the trained policeman is the other, and he can't just zap everything passing then agree that the one going to fast looked it at the time - he has to actually consider it to be speeding and then verify that with the camera. Some civilian with a bone to pick and dodgy equipment might, if they're lucky, get the police to 'have words' with a bad driver. Nick? Shouldn't think so. |
| LaserSteve:
Here, North East Ohio, was a Mad Max free for all. With only designated essentials on the road, zoom zoom at furious speeds. Including the cops and troopers, who would stay parked along the roads, evidently self isolating. I was staying slow, but having to dodge semi trucks. The semi's upped their game, "owning" the highway. Now after a period of intense enforcement we appear back to normal. I had no intention of ending up in custody or ER. Being one of the few designated employees on a huge campus was bad enough. Steve. |
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