[Elecraft] LCD TV Causing RFI

[Robert Harmon]

Brian,
Please keep us posted when you zero in on the culprit.

I had a similar RFI issue with one of our DirecTV boxes. I narrowed down to 
the RG6 coax feeding the box.  I added one ferrite choke to the cable 
right where it connected to the box and less RFI, added two more and voila, no more noise !

RFI mitigation is almost a science in itself.  My primary reference and one I recommend highly
for understanding and solving RFI issues is "A Ham's Guide to RFI" on line provided by Jim Brown, K9YC. 
The web page is  http://www.audiosystemsgroup.com/RFI-Ham.pdf


Bob
K6UJ



On Jan 30, 2011, at 3:19 PM, Brian - N5BCN wrote:

> 
> Thanks to everyone's suggestions, I'm zeroing in on the culprit!!!
> 
> For reference, the two TVs in my house with the issues:
> Samsung 46" LCD Model LN46A580P6F
> Samsung 40" LCD Model LN40A530P1F (we rarely use this one, that's why I
> didn't discover the RFI on this one until recently)
> 
> I had subconsciously convinced myself that it must be a noisy power supply
> in the TV, but it turns out this wasn't the case at all!!
> 
> There are only two wires connected to each TV: A/C power and a HDMI cable to
> the DVR (cable is plugged into the DVR, not the TV).  The DVR is always "on"
> to record show when the TV is off.
> 
> With the TV on, I unplugged the HDMI cable and viola!, no RFI.  So, it seems
> the noise is emanating form the HDMI cable, either being generated by the TV
> or the DVR, but ONLY WHEN the TV is on!  I have some #31 ferrite cores on
> order from Mouser, and the offending HDMI cable will be the first target.
> 
> I'm secretly hoping it's the DVR box, and not my TV, so I can blame the
> cable company.  ;-) Not sure how to isolate which one it is, though.
> 
> 73
> 
> N5BCN - Brian
> 
> -----
> K2 #6800 KSB2 KAT2 KIO2 K160RX KNB2
> -- 
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