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Re: [RFI] 13,000 Lumens - 150 watts - bad RFI

To: <jim@audiosystemsgroup.com>, <rfi@contesting.com>
Subject: Re: [RFI] 13,000 Lumens - 150 watts - bad RFI
From: "Tim Duffy" <k3lr@k3lr.com>
Date: Tue, 17 Nov 2020 19:33:54 -0500
List-post: <mailto:rfi@contesting.com>
Hello Jim:

An update on the LED RFI from the K3LR neighbor.

W3YQ and I built the choke system as shown in your cookbook. It was
installed on Saturday in a plastic box. It knocked down the RFI noise by
50%.
Better performance might be had with a larger box that would allow the input
and output of the filter to be wider spaced.

That being said, I still want to discover a similar light, with similar
lighting specifications that is RFI quiet - out of the box. 
My neighbor will allow the light to be replaced - but it has to be as
bright.

Thanks for your help Jim.

73
Tim K3LR

-----Original Message-----
From: RFI [mailto:rfi-bounces+k3lr=k3lr.com@contesting.com] On Behalf Of Tim
Duffy
Sent: Wednesday, November 11, 2020 8:45 PM
To: jim@audiosystemsgroup.com; rfi@contesting.com
Subject: Re: [RFI] 13,000 Lumens - 150 watts - bad RFI

Roger Jim

Thanks for the great help

73
Tim K3LR

-----Original Message-----
From: RFI [mailto:rfi-bounces+k3lr=k3lr.com@contesting.com] On Behalf Of Jim
Brown
Sent: Wednesday, November 11, 2020 8:40 PM
To: rfi@contesting.com
Subject: Re: [RFI] 13,000 Lumens - 150 watts - dad RFI

On 11/11/2020 5:22 PM, Tim Duffy wrote:
> Bad RFI on all bands RX at K3LR. Will #31 ferrite on the 120 VAC power
line
> (at the light) - many turns - fix this bad actor?

Probably yes. I'd start with the filter that W6GJB and I worked out for 
use on 2000i generators, described on page 23 of k9yc.com/RFI-Ham.pdf It 
was added to the ARRL Handbook a year or two ago.

Note that it's critical that all three conductors go through the choke, 
and they should NOT be twisted.

73, Jim K9YC

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