OT Flouresent light noise, on radio how to I kill it. |
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OT Flouresent light noise, on radio how to I kill it. |
Porcharu |
Dec 27 2005, 01:37 PM
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#1
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Senior Member Group: Members Posts: 1,314 Joined: 27-January 05 From: Campbell, CA Member No.: 3,518 Region Association: Northern California |
I have 5 identical light fixtures (2-40 watt tubes with electronic ballast) in my garage, 3 of them broadcast AM strongly (strong engough to interfere with car radios in front of my house) 2 of are silent. I have compared the wiring of all of them and they are identical. On one of the noisy ones I redid all of the connections, made sure the ground lug on the case was bare metal and added a ground wire to the ballast. Result - no change.
If only one tube is installed the light makes no noise, with two it screams. The source of the noise seems to be the wires between the ballast and the tubes and the tubes themselves. I am getting ready to try an input filter (corcom type) and some beads on those wires. Any other suggestions? I'm really tired of having a dark shop. I can't just return them because I have had them almost a year now. (IMG:http://www.914world.com/bbs2/html/emoticons/headbang.gif) |
Porcharu |
Dec 27 2005, 09:43 PM
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#2
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Senior Member Group: Members Posts: 1,314 Joined: 27-January 05 From: Campbell, CA Member No.: 3,518 Region Association: Northern California |
I just installed an input filter and shielded the feed wires to the tubes and very thoughly grounded everything including the cover that was totally isolated with paint. It helps but does not eleminate the problem. The tubes are still radiating RFI - I can move my hands across the tubes and hear the interference change. The only thing left is ferrrite beads and a cap arcross the feed wires. At least now my neighbors should not be having interference from my lights.
These type of ballasts in my new lights run the tubes somewhere between 25Khz. and 80Khz. Unfortunatly the DOE has banned the sale of the old magnetic ballast light fixtures and the new style pollute the AM waves. Somehow the FCC thinks this is just fine and approves of this type of light even thought it interfers with the emergency broadcast system (just heard a flood warning a little bit ago) |
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