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

[Michael Aust]

TimGlad you found SolutionDid same solution here ! MikeWB6DJI 


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On Monday, December 14, 2020, 3:54 PM, Tim Duffy <k3lr at k3lr.com> wrote:

The fix for this was one #31 mix ferrite 2.4" O.D. on the line cord (4 turns) of the light as it exits the housing. Then an EMI filter from Delta Electronics - model 10DWCG5. Result is RFI quiet from 1.8 to 52 MHz. Thanks to all for the help, especially Jim, K9YC.

73
Tim K3LR

-----Original Message-----
From: Jim Brown [mailto:jim at audiosystemsgroup.com] 
Sent: Thursday, November 19, 2020 2:02 PM
To: Tim Duffy
Subject: Re: [RFI] 13,000 Lumens - 150 watts - bad RFI

Maybe it's differential. so maybe try a conventional line filter? The 
key to it working is that the frame of the filter must be bonded to the 
frame of the lamp/PSU, or whatever ground is, and termination of green 
wires often has a Pin One-like Problem, or even isn't connected. :)

73, Jim

On 11/18/2020 8:49 PM, Tim Duffy wrote:
> The noise is 1.8 to 30 MHz - steady level
> 
> It was reduced by 6 dB with your filter  - was hoping for 15 dB or more
> 
> I need at least 20 dB reduction
> 
> 73
> Tim K3LR
> 
> -----Original Message-----
> From: Jim Brown [mailto:jim at audiosystemsgroup.com]
> Sent: Wednesday, November 18, 2020 11:46 PM
> To: Tim Duffy
> Subject: Re: [RFI] 13,000 Lumens - 150 watts - bad RFI
> 
> On 11/18/2020 8:23 PM, Tim Duffy wrote:
>> Hello Jim
>>
>> Not sure what you mean - your filter is very close to light and power supply. Noise is still there
>>
>> I need a RFI quiet 13,000 lumens out of the box.
>>
>> What other questions?
> 
> I asked 1) on what bands is the noise most problematic; 2) when you said
> the noise was reduced by 50%, I asked was that only 6 dB? or how many dB
> was it reduced, and 3) about how much more attenuation do you need on
> various bands.
> 
> 73, Jim
>>
>> 73
>> Tim K3LR
>>
>> -----Original Message-----
>> From: Jim Brown [mailto:jim at audiosystemsgroup.com]
>> Sent: Wednesday, November 18, 2020 1:33 PM
>> To: Tim Duffy
>> Subject: Re: [RFI] 13,000 Lumens - 150 watts - bad RFI
>>
>> Tim,
>>
>> Did you see my other questions?  They might help me think about what
>> might provide greater attenuation.
>>
>> 73, Jim
>>
>> On 11/18/2020 7:56 AM, Tim Duffy wrote:
>>> Hi Jim:
>>>
>>> Power supply is mounted to the light. Yes - your Romex dual core, single core - 7 turns. Only 6 inches of AC line from the light until the chokes.
>>>
>>> Thanks and 73
>>> Tim K3LR
>>>
>>> -----Original Message-----
>>> From: Jim Brown [mailto:jim at audiosystemsgroup.com]
>>> Sent: Tuesday, November 17, 2020 7:49 PM
>>> To: Tim Duffy
>>> Subject: Re: [RFI] 13,000 Lumens - 150 watts - bad RFI
>>>
>>> On 11/17/2020 4:33 PM, Tim Duffy wrote:
>>>> Hello Jim:
>>>>
>>>> An update on the LED RFI from the K3LR neighbor.
>>>>
>>>> W3YQ and I built the choke system as shown in your cookbook.
>>>
>>> Do you mean the two series chokes wound with Romex?  Exactly where is
>>> the choke located?  That is, how far from the lamp? Is the lamp
>>> self-contained (that is, power supply within the unit, or separate from
>>> the lamp, with wiring between them)?  It will b most effective if
>>> mounted with very short leads to the lamp/PSU.
>>>
>>> It was
>>>> installed on Saturday in a plastic box. It knocked down the RFI noise by
>>>> 50%.
>>> Can you express that in dB? I hope you don't mean 6 dB. :) On which
>>> bands are you having problems?
>>>
>>>> Better performance might be had with a larger box that would allow the input
>>>> and output of the filter to be wider spaced.
>>>
>>> Yes, that's possible.
>>>>
>>>> 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.
>>>
>>> Can't help with that, but a post to a couple of reflectors might bear fruit.
>>>
>>> 73, Jim K9YC
>>>>
>>>> Thanks for your help Jim.
>>>>
>>>> 73
>>>> Tim K3LR
>>>>
>>>> -----Original Message-----
>>>> From: RFI [mailto:rfi-bounces+k3lr=k3lr.com at contesting.com] On Behalf Of Tim
>>>> Duffy
>>>> Sent: Wednesday, November 11, 2020 8:45 PM
>>>> To: jim at audiosystemsgroup.com; rfi at 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 at contesting.com] On Behalf Of Jim
>>>> Brown
>>>> Sent: Wednesday, November 11, 2020 8:40 PM
>>>> To: rfi at 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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