tnx info Dave ....where can those be had?
On 12/20/2011 2:30 PM, David Raymond wrote: > > Jon. . .great advice, particularly about going to higher frequencies > as you get closer to the noise source. We've spent considerable time > chasing noise at our contest station. I addition to using RF we also > use a high range audio device with a highly directional dish antenna > which listens in the 20 - 40 KHz range. It is an excellent tool to > have in the arsenal when you get in close (say, 100 yards or so). You > can usually pinpoint the noise right down to the specific insulator, > lightning arrestor, etc. In some cases it would be worth borrowing one. > > 73. .. Dave > W0FLS > > >> Dave, >> >> I use my mobile rig to track down such noises (an IC-706Mk2G with a KJ7U >> 160-6m screwdriver antenna and 2/440 whip). I also have a couple of >> small AM and VHF-AM (aircraft band) portable radios when needed. >> >> The closer you get to the noise, the higher in frequency you should be >> be able to hear it. Sometimes I'm up to 300-400 mhz before I can zero in >> on the exact pole that is the source after driving back and force in the >> general area. Beam headings from the house can help with the initial >> zeroing-in. >> >> I make note of the pole number -- there are tags about eye level -- and >> then notify the utility. Here I have two that overlap in this area, and >> I've found the guy responsible for RFI issues in each and report it >> directly to him. They usually appreciate I've done all the legwork and >> get it fixed in short order. >> >> 73/Jon AA1K >> www.aa1k.us >> >> On 12/18/2011 2:36 PM, W5UN wrote: >>> I'm looking for input from someone who has experienced a similar >>> situation as I describe below. >>> >>> About 3 months ago I began experiencing severe noise on top >>> band. It's a constant white noise which begins to drop off above >>> 2.5 mHz, and is hardly noticeable on 80, and not there at all on 40 >>> meters and above. Every once and a while the noise will drop off >>> completely, only to return a few minutes later. It is there about 98% >>> of the time.The severity seems to vary a little, but is typically >>> S9+15 db when present, and S3 during the rare times it drops out.. >>> This noise is coming from the eastern direction, about a mile from >>> here. There are power lines.there, and these appear to be the source, >>> however there are similar power lines of the same voltage here in >>> other directions, including one to the southwest about 800 feet away, >>> but that one has no noise. Has anyone experienced such noise as this? >>> I need to see if I can track this down and get it fixed. Any help >>> will be appreciated. >>> >>> Dave, W5UN >>> >>> _______________________________________________ >>> UR RST IS ... ... ..9 QSB QSB - hw? BK >>> >> _______________________________________________ >> UR RST IS ... ... ..9 QSB QSB - hw? BK >> > > _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
