[RFI] Low voltage lighting solid state "transformers"

Bert Almemo balmemo at sympatico.ca
Sun Dec 17 19:09:25 EST 2006

 Many countries in Europe make the manufacturer responsible to fix a device
that is experiencing RFI. Among others my old country Sweden. I wonder whats
the reason they never made the manufacturers responsible on this continent?
Probably money? These days the general idea on this side of the pond is to
blame somebody else. Nobody takes responsibility for their own actions
anymore. That's probably why we have the highest number of lawyers per
capita in the world. That's my 2 cents!

Merry Christmas and Happy New Year!

73 Bert, VE3OBU/SM7BUR

-----Original Message-----
From: rfi-bounces at contesting.com [mailto:rfi-bounces at contesting.com] On
Behalf Of Kelly Johnson
Sent: Sunday, December 17, 2006 6:12 PM
To: rfi at contesting.com
Subject: Re: [RFI] Low voltage lighting solid state "transformers"

The point is that it is NOT illegal to sell a device that meets the emission
standards.  It is only illegal to operate it in a way that causes
interference.  There's a big difference.  The burden is on the USER to
resolve the issue, not the manufacturer.  The FCC won't fine the seller for
the device, but could fine the user of the device.  In my case, since I am
the one that owned the device and it only interfered with me then the FCC
won't do anything to make the manufacturer fix it.  If the device were owned
by my neighbor, the FCC could make the user stop using the device but they
won't tell the manufacturer to stop selling it since it meets the emission
 Likewise, TV manufacturers are not required to fix TVI problems.  The user
gets the shaft.  That's the biggest problem with Part 15 rules:
the manufacturers have no responsibility to fix or replace equipment unless
is it violates emission standards.  That means that the typical ham neighbor
gets the shaft.  What is my neighbor supposed to do when his TV picks up TVI
from my LEGALLY OPERATING station?  Call the TV manufacturer?  Yeah, right.
Name one television manufacturer that has ever replaced or fixed a device
that was experiencing TVI?

On 12/17/06, Tom Rauch <w8ji at contesting.com> wrote:
> > It may not violate FCC regulations.  I bought some LV landscape 
> > lights about 3 or 4 years ago along with a cheap power supply made 
> > by "Hampton Bay" for Home Depot.  This thing generated about
> > S7 or S8
> > noise on 20 meters from 100 feet away and wiped out the AM BC radio 
> > in my care from about 50 feet away or so.  It was hideous.  I 
> > replaced it with a Malibu transformer and all was well.  I sent the 
> > power supply to ARRL headquarters and they tested it.  The emissions 
> > were not strong enough to violate FCC regulations yet the noise was 
> > very strong.
> Technically any spurious emission that causes harmful interference to 
> a licensed service is illegal regardless of absolute level.
> The ARRL also would have had to test the device in the actual working 
> situation to be sure it fully complied.
> >The FCC radiation limits are not sufficient to prevent  interference 
> >even when the device is within limits.
> That's true for certain tests. That's why there is a blanket clause 
> that says the licensed service can't suffer harmful interference. Of 
> course we all know they won't generally enforce that type of rule, but 
> I have seen them enforce it.
> I've seen them enforce it with broadcast stations that had harmonics 
> that met spec but caused problems, and alarm systems that were 
> incidental radiators.
> It is accurate to say the rules prohibit harmful interference, but the 
> FCC is no longer run by people who understand communications systems. 
> They are all political appointees based on who's buddy or son it 
> is---and we keep re-electing the same crooked crew.
> 73 Tom
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