[RFI] QRM from recessed lighting

[kq3f at comcast.net]

Jim,

Thanks for the clarification, I should have known better. They are indeed
power supplies. Among other things I'm doing, I'll call ARRL to see if they
have any thoughts.

73, Joe KQ3F

-----Original Message-----
From: RFI <rfi-bounces+kq3f=comcast.net at contesting.com> On Behalf Of Jim
Brown
Sent: Monday, November 15, 2021 2:00 PM
To: rfi at contesting.com
Subject: Re: [RFI] QRM from recessed lighting

On 11/15/2021 5:43 AM, kq3f at comcast.net wrote:
> 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 hel

I suspect that there are no TRANSFORMERS (2-windings, magnetically coupled
on a iron core) in this system. Rather, what they are CALLING transformers
are switch-mode power supplies (SMPS), that convert 120VAC to low voltage DC
to power the LEDs.

SMPSs are notorious noise generators. I found them in back-cans for lighting
in the bathroom of the home we bought in CA, generating bodacious noise.
When I went to local electrical supply looking for a transformer, they tried
to sell me another SMPS that they called a "transformer."

73, Jim K9YC

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