JW jwin95 at yahoo.com
Fri Dec 23 18:25:52 EST 2016

Faraday cage or shielding? There is a difference ... the public misuses the term F. C.

In your case with the light, chicken wire or "hardware cloth" might provide a suitable E-field "shield" while still letting light pass, like a SCREEN ROOM does. Simply connecting the shield to the 3rd wire at the light might work, but IDK (I Don't Know) for sure.  
Good luck, Jim WB5WPA

      From: Tom Thompson <w0ivj at tomthompson.com>
 To: rfi at contesting.com 
 Sent: Friday, December 23, 2016 2:57 PM
 Subject: Re: [RFI] RF
Jim is right.  I have been fighting a motion activated night light for 
the last 2 days.  Since the motion activated device is so small, common 
mode current is probably not the culprit.  I built a differential choke 
and it made little difference.  In desperation, I hooked a small 12 volt 
battery with an inverter to power the device and still no luck.  My 
conclusion is the RF is coming through the air and the only thing that 
might help is a Faraday cage.  Since my device is a light, that won't 
work, so I guess they will go back to Costco.  Too bad because other 
than the RF susceptibility, it is a good product.

Tom  W0IVJ

On 12/23/2016 11:54 AM, Jim Brown wrote:
> On Fri,12/23/2016 9:59 AM, Bill Price wrote:
>> Any ideas as to how to solve this issue?
> Yes. Study k9yc.com/RFI-Ham.pdf  NO ferrite simply clamped onto a 
> wire is going to make a dent at 4 MHz. And there's no solution for 
> motion-detecting stuff like that soap dispenser -- they're input 
> circuitry is something very high Z and probably running wide open.
> 73, Jim K9YC


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