[RFI] Samsung refrigerator

john at kk9a.com john at kk9a.com
Mon Nov 30 16:49:58 EST 2015

Unplugging the refrigerator for a 48 hour contest would not make my XYL
very happy and I would certainly miss the cold beer afterwards.

John KK9A

To:	<rfi at contesting.com>
Subject:	[RFI] Samsung refrigerator
From:	"Mel Crichton" <kj9c at iquest.net>
Date:	Mon, 30 Nov 2015 20:44:46 -0000

Not sure if it was my review or not, but our 2011 Samsung two door low
energy refrigerator is horrible for RFI. When Samsung USA played dumb and
said that they could do nothing about it, I voided the warranty and
installed common mode and differential chokes INSIDE the casing. Did not
help. I added more common mode choke on the power line outside with no

The culprit is not the compressor but the compressor speed control that
creates variable frequency AC .... it's no doubt a square wave generator.
Sniffing the case shows the most RFI coming from the front panel near the
ice maker. When it runs, all HF bands have hash with shaprt spikes every 5

a cheaper unit with a bit more compressor noise and only ONE speed would
likely not have the variable speed feature..... and may be RF quiet

We also have a Samsung LED TV that likes to turn itself on whenever I am
on 80 meters.... not enough shielding (also tried common mode on this one)

For this reason I will not buy Samsung, and find no problem with Sony
electronics in the same area of the house.

(In both units I unplug them when I am on the air. My wife hates it when I
am in a 2 day contest.)

Mel KJ9C

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