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Old 01-05-2016, 07:23 PM   #1
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LED lights causing radio interference

We may have discussed this before on this forum. Anyway, I made a video to show how bad it is.
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Old 01-05-2016, 07:38 PM   #2
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Yeah, AM is very susceptible to interference. The LED electronics create a lot of RF noise, and the unshielded wiring to your fixtures acts as an antenna. It maybe possible to to add RF interference filters at the fixtures to block the radiation of the noise.

Google it for info and sources.
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Old 01-06-2016, 12:49 PM   #3
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I've thought about adding ferrite chokes to see if it would help, but haven't done it yet.
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Old 01-06-2016, 02:58 PM   #4
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The manufacturer of the lights tells me they are expecting in some revised replacement boards next month.
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Old 01-06-2016, 03:06 PM   #5
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Most LED lights today contain dirve circuitry in addition to the LED chip itself. That circuitry uses RF type frequencies to boost the voltage and current. The problem arises when the manufacturer uses ultra low cost poorly designed components to save money. Those components radiate the RF which then interferes with AM,FM and TV signals. In this case, it sounds like the manufacturer has acknowledged the problem and is correcting it. If you buy aftermarket LED modules be sure to check one for RF noise before you buy and install them all.
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Old 01-06-2016, 04:52 PM   #6
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I will say that on the past 3 RVs I bought cheap, unregulated replacement LED "bulbs" for the 921 and 1156 lamp fittings, and none of them behaved like this.
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Old 01-06-2016, 07:47 PM   #7
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I'd be happy to have any AM reception in my 2015 Sunseeker 2700. Even if the lights had to be off. I get that static all the time. We have to carry a portable radio to pick up any AM stations - even the local one in town.
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Old 01-06-2016, 09:23 PM   #8
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I'd be happy to have any AM reception in my 2015 Sunseeker 2700. Even if the lights had to be off. I get that static all the time. We have to carry a portable radio to pick up any AM stations - even the local one in town.
Do you have solar panels by any chance?

Also, you could try turning off AC breakers one at a time to see what happens. Then do the same with the DC fuses.
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Old 01-07-2016, 07:39 AM   #9
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Do you have solar panels by any chance?

Also, you could try turning off AC breakers one at a time to see what happens. Then do the same with the DC fuses.
No solar panels. It's been like that since day one.

I never thought of interference from within the coach. I'll give that a try next summer.
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Old 01-07-2016, 05:02 PM   #10
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FWIW It has been an issue with Amateur Radio Operators for quite a while. The basic problem is that the Chinese manufacturers of the power limiting circuitry are not providing the noise suppression they are required to under US law. It has become enough of an issue that the gummint is getting involved. The supplies are supposed to pass certification tests to be sold here. As I understand it the factory does the testing and certifies they meet specifications. Somehow they are not getting the idea that saying they do means that they do.

FWIW 2 LED's generally operate in the range around 3 VDC. Power dropping/current limiting resistors are quiet but waste a lot of power as heat. The switching regulators used are much more efficient but have a very fast rise and fall time with harmonics well above AM radio. It takes a few extra parts to slow the rise and fall times thus losing some efficiency while quieting the system significantly.
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