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Posted

I've recently bought a new Ryder 1200 lumen front mounted light (with a battery pack)

I initially gave it a test and all seemed well, however, recently I have noticed that when the light is on my computer (Blackburn 6.0) intermittently loses signal.

 

I have tried mounting the computer in line with the transponders and the light on the other side of the handle bars, but to no avail.

 

I would just like to know if there is anything I could do to contain the electromagnet field around my light cables which I assume is causing this problem.

 

Any help would be greatly appreciated

Posted

I think it is very unlikely that the light is causing the interference, but I could be wrong. Have you tried forcing it to happen, i.e. take the light off completely and move it around computer to see if you can make it happen. Then do the same with the light off and with no light...

Posted

I haven't taken the light physically off and tried to force it, but when i see the computer has lost signal, if i then switch the light off, signal restores itself almost immediately every time.

Posted (edited)

I have found that the battery pack of my light (or cables to it) does the same. Mine is a Pyro light and Polar 725i. I can limit the interference by moving the battery pack around or turning the light off. See if that helps. The moving around part that is. You obviously have to see, but by turning it off you can determine if the light is the cause. I'd be surprised if there is interference while it is off and no current is flowing.

Edited by Bonk-king
Posted

Look on the box of the Ryder light, does it have a CE mark on it? It should by law comply with a set of EMC (electro magnetic compatibility) standards specific to that light. One of those tests would be to determine what amount of electro magnetic emissions the light emits, or more particular the control circuitry of the light. If this level is above a certain level it could well cause a temporary loss of signal.

Posted

very weird... must be the cable routing supplying power to the light causing some magnetic disturbance, but I would think cellphones or HR monitors would have bigger influence.

 

-make sure cables are straight en not curled up, or turned around frame.

-They should cross as little as possible and avoid running them in parallel with another cable with current you might have on your bike.

 

Dont have a light, but know a bit about how current in cables can cause interference.

Posted

The Ryder light was repackaged by CWCycles and I can't seem to find this CE sticker.

I'm kind of in two minds as to whether to return it or keep it. I got it at a great price but it is a bit limiting when it comes to those early morning/ night rides.

 

@braailegend just to clear up, my computer is wireless so there is no chance of wires cross per-say but I kept the power supply cable out of the direct line of the transponder and the computer and found the problem still persisted

Posted

I think it is very unlikely that the light is causing the interference, but I could be wrong. Have you tried forcing it to happen, i.e. take the light off completely and move it around computer to see if you can make it happen. Then do the same with the light off and with no light...

 

surprised you'd say this, unless you are assuming there is no duty cycle involved powering the light. I'd hazard these newer generation LEDs would most definitely be running of PWM'd or similar power supplies, just to conserve battery power.

 

But given that i've had a light and my polar unit running simultaneously with no loss of data, I'm assuming the noise protection of the OPs HRM is not of sufficient capability.

Posted (edited)

On my previous bike I had a Polar HR, wireless computor and a Pyro light with battery pack next to each other with no problems.

 

 

EDIT: My Pyrolight is bought in May 2012 and I do have CE mark on the charger.

Edited by Mads
Posted

You will probably find the issue is coming from within the light housing and not the battery. These new led lights have little pc boards and led drivers, chances are they havent been too caring in testing these.

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