[RFI] Samsung refrigerator RFI

Tom Thompson tlthompson at qwest.net
Wed Aug 8 18:21:41 PDT 2012

Not completely. See below...

Emissions - USA
In the USA, the FCC exempts from its technical regulations appliances 
that contain “incidental radiators” such as switches and motors. Only 
appliances containing radio frequency (RF) or digital circuitry – 
defined as having clocks or oscillators operating above 9 kHz – fall 
under Part 15 rules, and even then there are additional exemptions under 
which the digital circuitry in appliances may fall:
Power consumption below 6 nanowatts (nW); this would apply to most 
calculators and some digital clocks.
Battery-operated only, and having an operating frequency below 1.705 MHz.
Used exclusively in transportation vehicles; these are subject to other 
industry standards.
Digital devices used in large motor-driven appliances such as 
dishwashers and air conditioners.
This last exemption to Part 15 regulation – digital circuitry used 
exclusively in appliances – was intended only for large appliances, but 
has been widely misinterpreted to apply to all appliances. The FCC 
allowed the exemption on the basis that their large motors effectively 
mask any emissions produced by the low frequency microprocessors they 
employ. There is no such basis for exempting a hair dryer, rice cooker 
or massager.
Notwithstanding any or all of the exemptions listed above, the appliance 
manufacturer is obliged to assure that his devices do not cause 
interference to radio or TV. FCC Part 15.103 states:
The operator of the exempted device shall be required to stop operating 
the device upon a finding by the Commission or its representative that 
the device is causing harmful interference. Operation shall not resume 
until the condition causing the harmful interference has been corrected. 
Although not mandatory, it is strongly recommended that the manufacturer 
of an exempted device endeavour to have the device meet the specific 
technical standards in this part.

73, Tom W0IVJ

On 8/8/2012 6:56 PM, Gary "Joe" Mayfield wrote:
> Bad News ----  Appliances are exempt from the stringent rules.
> https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?id=33062&switch
> =P
> The folks who made our washing machine were fully aware of this when I
> contacted them.
> Joe kk0sd
> -----Original Message-----
> From: rfi-bounces at contesting.com [mailto:rfi-bounces at contesting.com] On
> Behalf Of Tom Thompson
> Sent: Wednesday, August 08, 2012 6:54 PM
> To: Mel Crichton
> Cc: rfi at contesting.com
> Subject: Re: [RFI] Samsung refrigerator RFI
> I would, at the very least, file a report with the FCC.  This device is
> most likely not compliant with the conducted emissions requirements.
> Fixing these devices one at a time is getting really old.  In my
> neighborhood alone I have dealt with 5 grow lights, 3 halogen lights,
> and one surveillance camera.  All have been Chinese imports.
> Tom   W0IVJ
> On 8/8/2012 3:13 PM, Mel Crichton wrote:
>> My wife was so proud of herself when she bought a new Samsung side by side
>> refrigerator with energy saving compressor. Yes, it runs quiet and doesn't
>> use much juice, but the compressor drive has a 5 KHz supply, and as luck
>> would have it, it wipes out all the HF bands every 5 KHz. To make matters
>> worse, beside the 5 KHz birdie there's serious hash between the birdies.
> If
>> I want to operate, I kill the breaker to the refrigerator. This isn't
> doing
>> the fridge any good. I threatened to return the fridge but she threatened
>> other things. I may find a way to make it self-destruct.
>> I called Samsung  USA and they kept me on the phone for a half hour
> looking
>> for any tech support inside Samsung USA who might know of a fix. (My guess
>> is, inadequate shielding and probably a square wave generator). No
> dice....
>> they are not aware of this problem.
>> Any help out there? The warranty isn't expired yet, but I will be removing
>> screws in the next few days. I may get lucky with some simple shielding
>> (Already wrapped the AC cord in ferrites)
>> In the meantime, BEWARE of Samsung energy saving refrigerators. If you are
>> considering any top-end refrigerator, take a portable radio  with you to
> the
>> appliance store and make them turn the unit on to full cooling.
>> Mel KJ9C
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