On Wed, 11 May 2011 09:34:05 -0700, Jim Brown wrote: > On 5/10/2011 7:49 PM, Jim Wiley wrote: >> You guys are aware, I suppose, that interference of this level and >> duration clearly qualifies as the type of interference that merits >> direct FCC intervention. File a complaint. > > Absolutely. We are right and they are wrong. If we "lay down," we have > only ourselves to blame. > > One suggestion though for suppressing the RF trash. While I (so far) > have no experience with Plasma TV RFI, MOST RF trash from electronic > products, especially the stronger part of it) is radiated as a common > mode signal by wiring both inside and outside the product. We can't do > anything about the wiring inside the product, but we can kill the RF > current on the EXTERNAL cables that connect to it, like the power cable, > the coax cable(s), and any audio and video cables. > > To kill RF current on ANY cable, form a common mode choke by winding > turns around a ferrite toroid (or clamp-on). 14 turns on a #31 2.4-in > o.d. toroid is about right for 1-10 MHz, and 8 turns on a 1-in i.d. > clamp-on. For the higher HF bands (14-30 MHz), use 8 turns around the > toroid (either #31 or #43 mix) and 5 turns through the clamp-on. Use a > separate ferrite core for each choke. If you have trash on all the > bands, use both chokes on each cable. > > This may or may not help, and it certainly won't help the part of the > trash radiated by internal wiring, but if I had RFI from a plasma set, > I sure would try it before throwing up my hands. > > Lots of detail, including the technical explanations of why this works, > is in > > http://audiosystemsgroup.com/RFI-Ham.pdf > > 73, Jim Brown K9YC
Fine if it's your set. Not so easy if it's an obstinate neighbour... 73 Stewart G3RXQ > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > 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:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
