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  #1  
Old August 14th, 2019
patrickt patrickt is offline
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Default Laser Falsing - Long and Technical Question

I have a RedLine that I move between several cars that I own - it has had the "tune up" and new firmware with band segmentation. It works flawlessly in all but one of my cars. That particular car, an old classic, has the mounting of the RedLine adjacent to two old-style motor driven metal fans (think of a desk fan from the 1920's and that's what the fans look like). Those fans have old style motors, brush driven, and are powered by a dashboard switch. When I turn those fans on the laser alert comes on. This happens every time, day or night, cold or hot, sunshine or pitch dark, in the garage or out on the road. From time to time, I will also get the false laser alarm while out on the road when those fans are powered off. That only occurs when I'm running at a speed that would cause the fans to be turning via the wind movement through the blades. To rule out RF coming through the power wire itself, I plugged the RedLine in to a separate 12v transformer, plugged in to the wall outlet in my garage, and was able to get the same false laser alert with the RedLine plugged in to the wall instead of the car (but still having the RedLine next to the moving fans). So, I obviously have a problem with either: 1) RF leaking out of the old fan motors - not only when they are powered but also when they are spinning solely because of air movement through them; 2) Ambient light pulsing off the rotating metal fan blades; or 3) A combination of both. Now, I can't move the fans and I can't move the mounting location of the RedLine. Before I just give up and turn Laser detection off when putting it in that car, I thought I would first try putting capacitors across the power feeds to the two fans to try and reduce the RF that is no doubt polluting out. When I look at the RedLine manual I see for laser detection it is looking for 904nm and 33MHz Bandwidth. I note that the 33MHz is not "plus or minus" like the K and Ka bands, but rather a separate frequency apart of the near-infrared 904nm. What is that, some sort of local oscillator that the detector is looking for? Does the RedLine look for both the presence of 904nm pulsing light and a frequency of 33MHz before it triggers? If so, I can probably filter that 33MHz out. If my problem is that the metal fans are creating a pulsing light that fools the RedLine, then I'm pretty much SOL. I can't imagine that the two spinning fans are creating RF pollution at 904nm (maybe they are?), but I can see them polluting at 33MHz. Now, I don't want to send my RedLine in for a software change, I love it just the way it is. I would like to have Laser turned on in this car, but unless I can figure out how to filter out whatever is triggering the false alerts, that's what I'll have to do. Any suggestions?
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  #2  
Old August 14th, 2019
Butcher318 Butcher318 is offline
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The original Redline has long been discontinued so there are no more updates. Escort will still service this unit but I have a feeling yours is fine. Do you have a new smart phone near the detector? The only false laser it could get is noise through the power cord or light hitting the front or rear laser sensor.
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Old August 14th, 2019
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EscortRadar EscortRadar is offline
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It is due to excessive electrical noise making its way through the power cord and to the laser circuit (a high gain circuit). Adding a filter or choke to your 12VDC line or the detector's power cord should resolve it.

Unfortunately Radio Shacks went the way of the Dodo so you'll probably have to order one. Search for: "inline 12V filter", or a "clip-on magnetic choke". The choke is also referred to as a "ferrite choke".
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Old August 14th, 2019
patrickt patrickt is offline
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Thanks. I probably have a ferrite choke filter somewhere, so I will give that a try.
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Old August 14th, 2019
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And note that you should wrap the cord around one half of the choke, as shown here:

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  #6  
Old August 14th, 2019
patrickt patrickt is offline
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Default That Worked!

I had a choke filter handy and wrapped the "phone cord" that goes in to the RedLine as per your instructions. And, it worked. No more false alerts. Thanks for a prompt, and correct, solution.
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