I use a MFJ 1025 with excellent results BUT only on single point noise where the sense antenna can be fairly near your main receive antenna. It's not a simple process to get things right and sometimes impossible if the noise is coming from different spots or your have multiple sources of it. Nor example, several gapping insulators along a power like. One can be nuller completely. Not more tho. Broadband noise can be a problem too - depends how broad band it really is. You need to get a signature of the noise to try to chacterize it and of course you should try to identify at least one source ASAP. Start by using VHF am receiver with a small Yagi, them whe I get closer a UHF frequency and Yagi. If its very strong noise it is close by. Could be a neighbors house with a crappy switching supply battery charger. You need more info.
Sent from my iPad On Dec 19, 2011, at 14:12, Steven Raas <[email protected]> wrote: > Altho its not a broad signal .. quite the oppisite, I've recently learned > of the WSPR crowd is running prop beacons @ 1836.6 Just below where the > majority of the JT65 Activity is, I have rcvd these signals here @ my > location, along with the Call & Grid they send the TX pwr in dBm Most are > in the 40 - 30 dBm power level. > > Do you have or know someone that has one of those MFJ noise cancelation > boxes that uses a 'sense' antenna and you adjust the phase? > > I live in the depths of a big city.. and noise is status quo here.. I > havent tried one of these devices yet.. if I find a local ham that has > one.. ide Like to borrow it and see if it would be a viable addition to my > operations here. > > Good Luck, > > Steve Raas > N2JDQ > > On Mon, Dec 19, 2011 at 1:55 PM, Joe Giacobello, K2XX <[email protected]> wrote: > >> Regarding noise on 160M, I have been consistently observing all season >> long a broad signal, reminiscent of a plasma TV, centered around 1836 >> KHz. Since it seems to be on 24/7 and my closest neighbor is a half >> mile away, I don't think it's a TV. Has anyone else seen this signal or >> is it just local to me? >> >> 73, Joe >> K2XX >> >> On 12/19/2011 8:24 AM, Mike(W5UC) wrote: >>> On 12/18/2011 1:36 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 >>> Good Morning Dave: >>> >>> I'm not hearing that here in Lufkin, so it possibly local for you. >>> >>> 73, >>> Mike, W5UC >>> >>> >>> >>> >>> >>> >>>> _______________________________________________ >>>> UR RST IS ... ... ..9 QSB QSB - hw? BK >>>> >>> _______________________________________________ >>> UR RST IS ... ... ..9 QSB QSB - hw? BK >>> >>> >>> ----- >>> No virus found in this message. >>> Checked by AVG - www.avg.com >>> Version: 2012.0.1890 / Virus Database: 2108/4690 - Release Date: 12/19/11 >>> >> _______________________________________________ >> UR RST IS ... ... ..9 QSB QSB - hw? BK >> > _______________________________________________ > UR RST IS ... ... ..9 QSB QSB - hw? BK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
