Re: Topband: K1N DQRM Tracking Project

2015-02-09 Thread Charlie Cunningham
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 
 
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Topband: RHR etc

2015-02-09 Thread Lennart m
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

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Re: Topband: Elimination of Treadmill RFI on 160 meters

2015-02-09 Thread Don Kirk
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)
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Topband: 160 Worked All States

2015-02-09 Thread Steve Piotrowski via Topband
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
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