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Re: [RFI] QRM from recessed lighting

To: rfi@contesting.com
Subject: Re: [RFI] QRM from recessed lighting
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Mon, 15 Nov 2021 10:59:50 -0800
List-post: <mailto:rfi@contesting.com>
On 11/15/2021 5:43 AM, kq3f@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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