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Re: [RFI] QRM from recessed lighting

To: Christopher Wawak <kc2ieb@wawak.org>
Subject: Re: [RFI] QRM from recessed lighting
From: David Winarsky <david@winarsky.com>
Date: Wed, 17 Nov 2021 13:39:05 -0800
List-post: <mailto:rfi@contesting.com>
Unfortunately I installed Amico wafer LED's in my ham shack after testing the 
lights individually (hooked up to power and with an AM radio) and although they 
didn’t show any elevation in noise during my test, when I installed all 10 of 
them in my shack, there is 6-10db of noise to my antenna less than 50 ft away 
(and 70 ft up).  

I had also tested the Lithonia Wafer LED individually and DID notice an 
increase in noise, but never installed.  

@Christopher, how far away are they from your antenna?  I’m looking to replace 
the Amico’s with something else, but have yet to find a Wafer LED that is RFI 
free.

David K6ZD

> On Nov 15, 2021, at 7:12 AM, Christopher Wawak <kc2ieb@wawak.org> wrote:
> 
> I put 6-inch Lithonia Wafer LED lights all over my house, and they make no
> significant difference to my noise floor. There are at least 6 in
> every room, and my shack has 8 in the ceiling. They're controlled by lutron
> caseta dimmers, which are also not noisy. They are super simple to install
> (wire it up, squeeze some clips, and its in the hole), and you can probably
> find them to fit the existing holes.
> 
> For what it's worth, I've had contact with both Lithonia and TCP
> engineering (as well as Lutron!) with questions over these lights and got
> great answers. Maybe reaching out to Torchstar might give some relief?
> 
> The noisiest LEDs in my house were retrofit bulbs that went in recessed
> cans. After replacing these with TCP brand, I had no RFI issues though they
> still make an annoying audible buzzing noise that no one but I can hear.
> 
> On Mon, Nov 15, 2021 at 8:46 AM <kq3f@comcast.net> wrote:
> 
>> Apologies if this has come up before.
>> 
>> 
>> 
>> We've recently renovated the basement and installed LED recessed lighting
>> in
>> the shack. They're Torchstar 3000K "warm" lights, made in China. When I set
>> up my IC-7610 again, I noticed elevated noise levels on 15-10 meters. After
>> thinking about it for a few minutes, I turned off the lights. Noise was
>> gone. Turn the lights back on, noise returns. And so on.
>> 
>> 
>> 
>> I suspect the noise is coming from the transformers. Any idea how to deal
>> with this, or do I need to replace the lights with something else? Thanks
>> in
>> advance for any help.
>> 
>> 
>> 
>> 73, Joe KQ3F
>> 
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