 | Home > In Car Electronics > DRL causing radio interferance |
 
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| HansT Member Since: 25 Dec 2012 Location: Mariefred Posts: 173   
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I have just fitted some inexpensive chinese DRL and this is causing a trerrible radio interferance. Is there a simple way to solve this?
The radio is LR original. I take the signal to DRL from the cigar lighter. The DRL relay box is fitted next to the radiator so it is far away from the radio/antenna. Regards/Hans |
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21st Jan 2014 8:52pm |
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| HansT Member Since: 25 Dec 2012 Location: Mariefred Posts: 173
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Thanks for those suggestions. I have already purchased a couple of ferrite beads but have not tried to fit them yet due to cold weather. Should they be fitted as close as possible to the lamps?
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2nd Feb 2014 11:45pm |
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| Shax Member Since: 05 Oct 2010 Location: London Posts: 391  
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Fit any interference suppression bits as close as possible to the offending items.. ... ,-------,
.. I [__][_]|__ .. I __ |"_|"__| .. "(o)====(o)" ^^_-^-_^-^_^^^^^--^^^^ PAUL G7ALW 14.200 USB 26FB458 / 27.275 SSB |
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2nd Feb 2014 11:56pm |
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| Theater Member Since: 27 Sep 2010 Location: Pisa Italy Posts: 514  
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I have the same issue with a "VisionX" LED lights... Marco
Defender 110 "SW" SE Galway Green MY 2009 Ex Defender 90 "SW" S Santorini Black MY 2010 |
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3rd Feb 2014 11:38am |
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| HansT Member Since: 25 Dec 2012 Location: Mariefred Posts: 173
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Today I fitted the ferrite beads close to the LED lamps. A slight reduction of the interferance could be noticed.
Then I made a loop of the connection wires so that they went through the ferrite beads twice. This made a further reduction of the noise but still not acceptable when the radio reception was poor. Conclusion is to buy better quality DRL or go back to use the normal headlights...  |
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6th Feb 2014 9:16pm |
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| Shax Member Since: 05 Oct 2010 Location: London Posts: 391
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lookie lookie here...
https://www.dropbox.com/s/3bybttoxxlcient/Fair-Rite1.pdf Some useful info about using ferrites and their selection.. ... ,-------, .. I [__][_]|__ .. I __ |"_|"__| .. "(o)====(o)" ^^_-^-_^-^_^^^^^--^^^^ PAUL G7ALW 14.200 USB 26FB458 / 27.275 SSB |
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7th Feb 2014 12:37am |
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| HansT Member Since: 25 Dec 2012 Location: Mariefred Posts: 173
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Interesting reading Paul. But I must admit that I did not understand anything...
The type of suppression core that I use is shown on page 2, figure 3 - (2) Split Round Cable Suppression Core. And I have both the (+) and (-) wires going through the core. This gave a very small improvement. I then took the wires twice through the core and this gave a further improvement. But there is still a lot of interferance so i would suggest that the suppession cores are not a good solution unless there is another way of connecting them. But again, I could not digest the information in that technical report  |
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7th Feb 2014 8:07pm |
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| Shax Member Since: 05 Oct 2010 Location: London Posts: 391
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I agree that the tech sheets are hard going.. Type 31 material cores have the greatest range of attenuation.. But you can always mix n match..
My recently fitted double USB outlet is chucking out a ton of interference, I thought it was my stereo going deaf, but my Ham handheld is suffering too when used in the 90, so it looks like I'll be playing ebay to get the cores and capacitors for the cure. ... ,-------, .. I [__][_]|__ .. I __ |"_|"__| .. "(o)====(o)" ^^_-^-_^-^_^^^^^--^^^^ PAUL G7ALW 14.200 USB 26FB458 / 27.275 SSB |
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10th Feb 2014 8:48pm |
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| bpman Member Since: 21 May 2008 Location: Oslo Posts: 8069 
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Take your feeds from the battery, both +ve and -ve, makes a huge difference.
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10th Feb 2014 9:15pm |
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| Shax Member Since: 05 Oct 2010 Location: London Posts: 391
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I just had a dig around in my parts box, and found a bag of T130 type 26 toroids, so I made a simple common mode choke..
7 turns of heavy gauge wire on both sides, wound in opposite sense to each other.. See picture, says it better than I can type. I'll try to fit it this weekend, assuming the rain stops, and see what improvement it makes  Click image to enlarge . ... ,-------, .. I [__][_]|__ .. I __ |"_|"__| .. "(o)====(o)" ^^_-^-_^-^_^^^^^--^^^^ PAUL G7ALW 14.200 USB 26FB458 / 27.275 SSB |
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10th Feb 2014 9:47pm |
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