Just to add to Scotts observation, I just finished working with my neighbor
on a RFI problem caused by LED light strings. His house is about 200 ft
away from mine. I had two types of noise, one that sounded like a variable
speed motor ticking away about 2-3 times a second and which was not synced
with the AC line (random). The other noise was a raspy noise.
By turning off breakers and unplugging things, both of these were traced to
the power supplies for LED light strings. The noise was present when the
power supplies were plugged in but LED lights were off. Once the lights
were turned on, the noise disappeared. Since the lights were seldom used,
that explained why the noise was their 99% of the time but once in a great
while disappeared. Both of the power supplies were manufactured in China.
Since they were not used much, the neighbor wanted to discontinue use of
them.
Once I illustrated the noise from outside his house (RFI typically sounds
nasty when in close proximity and usually makes an effective demonstration),
we accomplished the work by me listening at my radio and him switching off
breakers and unplugging things. We coordinated via cell phones. Full
social distancing.
Jeff, W4DD (Atlanta)
-----Original Message-----
From: RFI <rfi-bounces+w4dd09=gmail.com@contesting.com> On Behalf Of K9MA
Sent: Sunday, October 11, 2020 10:20 PM
To: rfi@contesting.com
Subject: Re: [RFI] Anyone Tested These LED Light Bars for RFI?
One problem is that even if a particular model is quiet, the next batch of
that model might not be.
I put a bunch of different LED fixtures in my house recently. Before I
installed them, I powered up each one close to where it was going to go and
listened for noise. All turned out to be quiet, at least at a noisy urban
QTH. I recommend such a test, before you throw away the receipt. I did have
to replace some of my neighbors' LED power supplies.
73,
Scott K9MA
On 10/11/2020 7:41 PM, D C _Mac_ Macdonald wrote:
> Let us all know if they are RF quiet!
>
> 73 - Mac, K2GKK/5
> Since 30 Nov 1953
> Oklahoma City, OK
> USAF (Retired) 61-81
> FAA (Retired) 94-10
>
> ________________________________
> From: RFI <rfi-bounces+k2gkk=hotmail.com@contesting.com> on behalf of
qrv@kd4e.com <qrv@kd4e.com>
> Sent: Sunday, October 11, 2020 18:45
> To: RFI@contesting.com <RFI@contesting.com>
> Subject: [RFI] Anyone Tested These LED Light Bars for RFI?
>
>
https://www.amazon.com/Integrated-Fixture-Linkable-Fluorescent-Replacement/d
p/B07TYJ22QJ/
>
> I need a few around the radio room and shop and 3', 15w, 1500 lumens
> @6000k meets the need well.
>
> I know I should be suspicious of built-in 85~265VAC 50/60Hz power
> supply, but maybe?
>
> Thanks, David KD4E
>
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--
Scott K9MA
k9ma@sdellington.us
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