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LED lights and RF interference??

Discussions regarding lighting, sirens, and other PS/Emergency response equipment can be had within this forum.

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hfrdust
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Joined: Mon Dec 30, 2013 3:56 pm

LED lights and RF interference??

Postby hfrdust » Mon Dec 30, 2013 4:03 pm

Has anyone had issues with their mobile radios after installing LED lighting? I have rear 3 head LED lights and a directional LED light bar in the rear window of a pickup. When I turn on either of the LED lights or the directional bar I cant hear our dispatch or they are so scratchy I cant understand them?

KB2ZTX
was jsikora
Posts: 264
Joined: Wed Jun 11, 2003 9:38 am

Re: LED lights and RF interference??

Postby KB2ZTX » Tue Dec 31, 2013 12:21 pm

Need alot more info than this.

What kind of radio, band, frequencies, antenna location, mount, power...
KB2ZTX

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Bill_G
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Joined: Thu Sep 17, 2009 5:00 am

Re: LED lights and RF interference??

Postby Bill_G » Tue Dec 31, 2013 12:48 pm

Yep. It's the switching power supplies for the LEDS throwing off cacapoopoo. You could try doing a better job with the wiring, grounding, filtering the power, etc AFTER (emphasis on AFTER) you have determined the noise is not being radiated. They can do it both ways - trash the power line, and trash the air. You have to do some careful troubleshooting, and you may have to get rid of the lights.

Will
Posts: 6823
Joined: Tue Sep 04, 2001 4:00 pm

Re: LED lights and RF interference??

Postby Will » Tue Dec 31, 2013 3:39 pm

KB2ZTX wrote:Need alot more info than this.

What kind of radio, band, frequencies, antenna location, mount, power...


AND what kind/brand/model "LED's" and their power supply.

Good power wiring practices are learned in Alternator Whine 102, AND BSP.

RFguy
Posts: 1294
Joined: Wed Dec 21, 2005 6:17 am

Re: LED lights and RF interference??

Postby RFguy » Tue Dec 31, 2013 5:24 pm

We have found Federal Signal LED's to produce near zero interference.

Whelen are considerably worse. Tomar are terrible. Knockoffs are generally poor.

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WA3VJB
Posts: 105
Joined: Mon Jun 26, 2006 9:36 am

Re: LED lights and RF interference??

Postby WA3VJB » Sun Jun 01, 2014 4:00 am

I had a self-contained visor LED amber/wht pair, cheapie off Amazon, that was quite noisy on VHF.
No control box, just a button on the back to step through on/off & flash type.

I wrapped the housing in self-adhesive aluminum tape used for sealing HVAC ducting, and it cut the noise to a tolerable level. I was surprised at the effective impact, since the front facing light output remained uncovered, but without knowing how the circuit board was situated inside the housing I must have lucked out.

The thing crapped out soon after and was discarded, but the noise suppression technique might be helpful to others.


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