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Old 11-28-09, 12:55 AM   #1
RFC
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Light interference with cyclometer

Hi All,

I recently started using a MagicShine and, yes, it is great. However, the light does interfere with the operation of my wireless cyclometer. Is there a way to shield the light? Does placement of the light and/or the power pack on the bars or bike make a difference?

Thanks
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Old 11-30-09, 12:30 PM   #2
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Sorry for the bump, but I'd be truly amazed if you guys haven't thought this one out yet.
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Old 11-30-09, 12:44 PM   #3
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Go to page two of this forum. There has already been numerous discussions on this.
The latest one being Here.
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Old 12-01-09, 08:14 AM   #4
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There have been several threads about this, but the short answer is that you probably need to ditch the wireless computer. An old-fashioned, wired computer will solve the problem.
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Old 12-03-09, 03:39 PM   #5
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Moving the battery further away also works, or at least it did for my Dinotte and Sigma 1606L. I put thebattery pack under the top tube just behind the head tube, which let me put the light itself on the bars right next to stem. The computer was in the same position on the bars, on the other side of the stem. Both were out of the way, and didn't limit hand position at all.

You want to avoid placing the battery pack too close to the head unit, and also not directly in line between the head unit and fork-mounted sensor.
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Old 12-04-09, 11:02 AM   #6
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Some bike computers are more heavily influenced than others. I mount my batteries on the stem RIGHT NEXT to the computer. One is a Sigma Rox9.0, the other isa Specialized (whatever they're selling right now wireless). I've only experienced interference once out of the Specialized. NEVER from the Rox. Of course, I'm using a TridenX, not the magicshine. Their may be some design there that minimizes wireless interference that the Magicshine does not possess.
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Old 12-04-09, 11:35 AM   #7
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Get a ferrite bead and install it right near the lighthead, running the cable through it a few times. (Don't get it from this site, however -- I used their link because they had a good picture of it and a shot of it in use. Our local Frys has them, and Radio Shack might, as would any local ham radio shop.)

The most likely cause of the noise is that the light is being flashed on and off very fast (that's how they regulate the brightness in an efficient way) and this is generating noise, and the noise is being radiated by the power lead -- it's acting as an antenna. The ferrite bead will help attenuate that. Other options include moving the lighthead, wire and/or battery further away from the cyclocomputer receiver.
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Old 12-07-09, 10:09 AM   #8
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Thanks all. I tried moving the battery farther away, and that works.
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