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 > > > <I'd be interested in some project like that, but I'm afraid it would > 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