KL7DTH, Lee, and I share a QTH and rigs. One of our neighbors has a plasma TV, and it produces very strong signals every few kHz across the 160 and 75 meter bands. We purchased a DX Engineering NCC-1 noise canceler, and it completely removes the TV set noise. Part of the secret is getting a noise-pickup antenna as close as possible to the interference. We use a 40-foot (non-resonant) dipole about 10 feet high, erected right on the property line closest to the neighbor's house, and thus about 60 feet from the TV set in question. .
Without the noise canceler, TV set hash runs to over S9 on both 75 and 160. When the NCC-1 is on and adjusted properly, the plasma TV set hash reduces to S1 or less on 160 meters. On 75 meters, our noise level is S-zero. This is when using our NIVS antennas, a full-size 75 meter vertical-firing cubical quad, or a full-wave loop on 160. . The noise is worse on the 75 or 160 meter verticals, but we still see a several S-unit reduction in TV set hash. Keep in mind that such a technique works on only one noise source at a time. If you have multiple noise sources., you could use more than one noise reductions unit, or perhaps other methods will work for you. I think other manufacturers offer a similar unit. I have not tried the others, and cannot offer an opinion on how effective they are, or are not. - Jim, KL7CC . Brian Moran wrote: > I have a neighbor a couple of hundred yards (yes, that far) that away that > purchased a plasma approximately 15 months ago; since then, when it's on, I > have s7-s9 noise from the AM band through 80m (at various points). I offered > to > purchase a new LCD display for him to replace it, but he "likes the way it > looks > better than any other". I don't expect to be able to obtain relief short of > FCC > intervention. It even interferes with vehicle AM radio while driving near > his > house. While the ARRL recommends to work with your neighbor to try to solve > the > issue (with ferrites and the like), I don't believe this advice is in tune > with > today's social conventions, liability laws, "last mechanic syndrome", and the > like. I would be reluctant to touch anything on anyone else's equipment lest > I > be responsible for any future real or perceived issues with proper operation. > I > think the only effective solution would be to 'go nuclear' and get the FCC > involved; what I find is that I just operate less. > > Quite the bummer, because my favorite band over the last few years has been > 160m. > > > ______________________________________________________________ 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
