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 > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/LCD-TV-Causing-RFI-tp5973980p5975705.html > Sent from the [HAM] mailing list archive at Nabble.com. > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
