Re: Topband: K1N DQRM Tracking Project
Actually ,Jim, the velocity of propagation of radio waves (or light waves) in free space is about 1 foot/nanosecond, NOT 1 foot per microsecond. It would seem to me that one needs to have a measure of directivity as well a s time, an the time factor might boil down to phase difference measurements. Thinking of applying all of this to something complex like SSB modulation sounds pretty messy. And a lot of the interference originates outside our borders, so I don't see who would be the enforcement body? Just my $0.02 73, Charlie, K4OTV -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Jim Garland Sent: Sunday, February 08, 2015 9:08 PM To: 'Lee K7TJR'; Topband@contesting.com Subject: Re: Topband: K1N DQRM Tracking Project I agree, Lee. Locating a DQRM station involves accurately time stamping the arrival time of their transmissions, at (at least) three receivers at known locations. Once the arrival times are known, one can use trigonometry to calculate the location of the interfering station. Since radio waves travel about one foot in a microsecond, and since a microsecond is an eternity by modern frequency counter standards, it should be possible to get very precise locations. The city block mentioned earlier should be readily doable. Of course, this requires that the three receivers be able to copy the DQRM ground wave signal, since the arrival times would otherwise be dependent on ionispheric reflections. More than three receivers would result in more accurate position measurements.. There's no need to use direction finding equipment, which are very low resolution by comparison with time measurements.. I'm no authority on FCC rules, but I'm under the impression that deliberately interfering with other licensed transmissions is against the law. Every month or so, the FCC nails some renegade ham or CBer for doing just that. Probably just publicizing the callsign of the culprits would be a large deterrant for all but the most sociopathic offenders. 73, 'Jim > -Original Message- > From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Lee K7TJR > Sent: Sunday, February 08, 2015 4:47 PM > To: topband@contesting.com > Subject: Re: Topband: K1N DQRM Tracking Project > > > Greetings top-band community, > > Interestingly enough the technology exists right here in our own Ham > community that could go a long way toward finding these DQRM culprits. > There are some beam forming arrays that operate with SDR > technology where a recording can be made of a target bandwidth and > later reviewed with > beam forming techniques to DF using a peak or notch completely after > the event has long gone. In fact directional and strength data can be > stored in > perpetuity. > So my comment is don't underestimate the ability to identify these idiots. > Being able to actually replay an entire contest and do a strength > and directional analysis in a narrow bandwidth after the fact to me is > the ultimate receiving system. > > Lee K7TJR OR > > > only get to a general area. With maybe 3-10 idiots at any one time, > and the 3-10 > active at any time probably varying every hour, it might be pretty > tough to > do anything meaningful. > > Since attention is what they want, I wonder if this effort would not > encourage participation in jamming at a faster rate than it solves anything? > > Has anyone ever looked to see if there is any correlation between > intentional QRM and the DX station spreading people over a wide swath > of the > band? More than once, I've heard people intentionally threaten to QRM > DX because they were POed that their QSO was interrupted by a pileup.> > > <73 Tom > > > _ > _ > Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Topband: 160 Worked All States
Hi All! So back to this WAS discussion I could use MT and ND on CW and Nebraska on SSB. can anybody help a fella out? I'm willing to get up early or stay up late. I'm on eastern time. there are more I need on 160 but i'm not being too picky to start (AK, LA, HI, OR) in case anybody is interested. Steve AG2AA _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: RHR etc
Isn't this RHR is the extension of building your own radio versus buying it or renting it? I am 78 and considering to have my TX and antenna at my son's house and moving into a condo and operate remote. Would I use a remote in South Korea to work P5 on 160 meters? Hell no. Would I use the same remote to work my two needed counties for all. Again, NO. my 2c worth. 73 Lou KE1F On 2/9/2015 4:21 PM, Lennart m wrote: Just a few comments in case you guys gone to sleep! The other day Tree, N6TR/7 said he had to QRT to fix some changes to his remote control of his base station. Hope you managed Tree and I understand you need it during all BSNS travel flights, so far so good. If, and when, I would ever dream of spending a few bucks renting a RHR station, e.g. W7XX to give me another DXCC that would be an entirely different case. Paying money to rent another ham*s setup would, at least to me, mean I would be paying for a service which would be out of my control. It would add no joy working another and new DXCC using somebody else equipment. (Just a comment: and no bragging: I do not need K1N on 160 or any other low band. Furthermore I cannot understand the minds of those DQRM guys that have showed up even on 160. Back to basics guys and please do make QSO:s the old fashioned way. GL with K1N or anyone else and leave at least 160 free from foolishness. Len SM7BIC _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Topband: RHR etc
Just a few comments in case you guys gone to sleep! The other day Tree, N6TR/7 said he had to QRT to fix some changes to his remote control of his base station. Hope you managed Tree and I understand you need it during all BSNS travel flights, so far so good. If, and when, I would ever dream of spending a few bucks renting a RHR station, e.g. W7XX to give me another DXCC that would be an entirely different case. Paying money to rent another ham*s setup would, at least to me, mean I would be paying for a service which would be out of my control. It would add no joy working another and new DXCC using somebody else equipment. (Just a comment: and no bragging: I do not need K1N on 160 or any other low band. Furthermore I cannot understand the minds of those DQRM guys that have showed up even on 160. Back to basics guys and please do make QSO:s the old fashioned way. GL with K1N or anyone else and leave at least 160 free from foolishness. Len SM7BIC _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Elimination of Treadmill RFI on 160 meters
Data from another treadmill RFI success story. A few days ago Lionel (N5LB) added filters to his treadmill based on what I had done to eliminate RFI from my wife's treadmill, and below are his very successful results. Don I want to tell you my results with the treadmill and the delta filter. Before the filter: 160m - 91 dbm 80m -77 dbm 40m -97 dbm 20m -93 dbm 15m -97 dbm 12m -110 dbm 10m nil After the Delta install 160, 80, 40, 20 m below the mds at - 131 dbm 15, 12m -110 dbm After adding a FT240-61 with 7 turns of #12 stranded in the line side of the Delta. 160 - 10m not measurable, mds is ~ -131dbm. Not visible on Flex 5000 waterfall. All of the dbm readings are from the Flex 5000 meter. S7 = ~ -90 dbm so the RFI was really bad. So like you case I needed additional filtering. For me it was higher in frequency so the Delta attenuation must drop off above 20m. I was able to fit the Delta and the toroid inside of the treadmill motor and control housing making for a neat install. Thanks for the excellent suggestions. I bought the Delta from Digikey and had it 36 hours later, incredible service. Lionel Note that Lionel used the same Delta Filter that I used (model : 20DRGG5). He used an FT240-61 core which he had on hand with 7 turns of the Hot and Neutral wires passing through the core (ground wire die not pass through his core) whereas I used 14 turns of the power cord on a 2.4" OD Fair-Rite #31 mix toroid core (Neutral, Hot, and Ground wires passing through the core). Just FYI, and glad to hear others are having success using filters on their treadmill similar to what I used which have provided excellent results. 73, Don (wd8dsb) _ Topband Reflector Archives - http://www.contesting.com/_topband