I used ANC in the past. It was good. Sent from my iPhone 4
VK7JB <zen...@netspace.net.au> 於 2010年11月27日 下午2:18 寫道： > > Well, 80% of my operating time is spent in what seems like electromagnetic > hell. The irony is that I live in a rural area at the end of the earth. I > have only 3 neighbours within a 4km radius. One of them has a plasma screen > TV. Another has something else, perhaps an arcing thermostat or fluoro > light, which adds to the cacophony which dances across the whole of my > operating spectrum, from 80 to 10m. The din varies in intensity and > duration. Sometimes it's not there and then, for a brief time, I enjoy the > silence. > > I was about to abandon the hobby, but some reading led me to the "noise > cancellers". I had learnt very early on that "noise blankers" and DSP were > feeble weapons against the particular noise mix at my QTH. So I first > bought the MJF 1026 because I could get it locally and it was inexpensive. > I experiemented with many different noise antennas. It was OK, but very > inconsistent in its effect. On a good day, it reduced the racket, but the > nulls were elusive and the time I spent using it merely amplified my > frustrations. I took it apart one day and was shocked. I boxed it up, put > it in a cupboard and ordered an ANC-4. My hopes weren't high, but the > future of my ham radio career depended on finding a solution. So the ANC-4 > arrived from across the Pacific- sturdily designed, heavy, and well crafted > inside and out. I pluged it in, attached the noise antenna, turned it on > and for the first time, killed the noise. On all bands, quickly and without > frustration. S7 din, obliterating everything, consistently and predictably > reduced to hush. > > This one piece of equipment has saved the hobby for me. At my location and > with my particular noise blend, it has worked a treat and much, much more > effectively than the first noise canceller I tried. Others have reported > exactly the converse experience - neither unit having any effect, or the MFJ > unit giving superior results. For all the science involved, noise busting > with this equipment is inexact and unpredictable. > > Of course, I'd rather not have to use this black box at all. It reduces > received signal strength noticably, but then the alternative is > buzzzzzzzzzzzzzzz covering everything. And yes, I'm sure it's degrading my > IMD and threatening the purity of any number of other parameters of my > transmitted signal. But again, the option is nothing at all. This > afternoon, I just put the 94th country in my log: all were caught on SSB > phone, with 100 Watts and a wire antenna sitting here under my blanket of > noise. I enjoy this hobby far too much to let it go. > > Borrow an ANC-4 and see what it'll do for you. If it doesn't work, then try > the MFJ 1026. Just don't give up. > > 73, > > John > VK7JB > > > > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/Plasma-TV-Noise-any-ideas-on-how-to-filter-it-out-tp5775346p5779093.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
