[RFI] Noisy LED shop lights

[Stephanie WX3K]

Here is a helpful link
https://www.digikey.se/Web%20Export/Supplier%20Content/Lambda_285/PDF/TDKLambda_all_about_emi_epmag.pdf

If you search Amazon by entering EMI filter you will find a variety for different applications. 

Of course you need to determine how the RFI is being picked up by your antenna. This is key in suppressing the noise source. Perhaps even several wraps thru an appropriate torroid core might even help you too. 

Ballasts or not, An EMI filter mounted on the light housing would be the most effective i believe assuming the offending circuit is not in a wall wart. If a switching supply in a wall wart is the  noise source, you would be to insert filtering some other way.

Stephanie

> On Jun 10, 2018, at 7:15 AM, Dale Johnson <dj2001x at comcast.net> wrote:
> 
> I don’t believe LED shop lights have a ballast.  
> 
> I am not sure if the noise is in the power line or is being radiated directly.  I took my portable SW radio out there and it picked up the noise very nicely.  Of course the line cord could be the antenna too.  
> 
> Do you recommend any particular filters?  I should try one and see if it helps then if it does I would install on the other three.  Sure is nice lighting, makes my shop really light up.  
> 
> tnx
> Dale, K9VUJ
> 
> 
> 
> On 09, Jun 2018, at 20:39, Stephanie WX3K via RFI <rfi at contesting.com> wrote:
> 
> Install EMI filters on the lights. Most of the ballasts these days are noisy. I had an issue on 6 meters until i installed EMI filters inline. 
> 
> A typical filter costs about $10-15
> 
> Stephanie
> 
>> On Jun 9, 2018, at 2:12 PM, Dave Cole (NK7Z) <dave at nk7z.net> wrote:
>> 
>> If you have a screen capture of the RFI, using an SDR, or P3, could you send it to me please?  I would like to add it to the ever growing RFI snapshots web page I have.
>> 
>> 73s and thanks,
>> Dave
>> NK7Z
>> https://www.nk7z.net
>> 
>>> On 06/09/2018 11:01 AM, Dale Johnson wrote:
>>> I found some nice shop lights for under $20 so I purchased 4 for the garage shop.  After installing them I found lots of noise on 20 meters with peaks and valleys, to make sure the new shop lights were the culprit I turned them off and then the 20 meter band was quiet again.  These are Smart Electrican brand, model number LSL3300L42WH.  These are distributed by Menard, Inc. Eau Claire Wisconsin.  Made in China.  I purchased a couple more for my basement shop, but I’m going to return those.
>>> Anybody know of a quiet brand of LED shop lights?
>>> Tnx 73
>>> Dale, K9VUJ
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