From the most precise ones: (i.e. giving a dot, not a curve)
* Pinpointing several Bulgarian and North Korean embassies in Europe * Locating the unid parallel 6-tone MFSK system on 7674, 10222, 12130, 14462, 16115, 17456 in Frankfurt area
I found it tough to find 3 stations that could plot WWVB on the map. I don't know if it is because of the type of signal transmitted or what. Ron - KA7U
@Ron, That image shows IQ mode, but with a center frequency of 59.5 kHz and an unbalanced passband that is much too wide for running TDoA on WWVB. If you actually ran using these settings try running again on exactly 60 kHz with a balanced passband of, say, 100 Hz. Hold down the shift key and then click the +/- magnifying glass icons (zoom icons) to symmetrically adjust the passband. Each time you click the passband is reduced (increased) by 80%. Hover over the left or right yellow passband edge to see the current bandwidth.
John, OK, that did a much nicer result. Very nice! I did check the results and found the triangulation point to be approximately 70 miles north of the transmitter towers. I suppose KiwiSDR location information could be inaccurate and other reception anomalies could affect the accuracy as well. Still 70 miles is pretty close. Ron - KA7U
I experimented with the 180 degree path crossing. It fails everytime. I can hear the station with my receiver, but it won't plot with the other receivers for this station. Still good results with stations not crossing the 180 degree longitude, I'd say. Ron - KA7U
Congrats. That's the first DF of NWC I've seen. I've tried from here but the NZ Kiwis capable of hearing VLF are either off or can't get it anymore (i.e. mine).
There are problems when stations cross 180 deg even when the map range doesn't. I haven't had time to look into it in detail yet.
Comments
* Pinpointing several Bulgarian and North Korean embassies in Europe
* Locating the unid parallel 6-tone MFSK system on 7674, 10222, 12130, 14462, 16115, 17456 in Frankfurt area
Ron - KA7U
Attachments:
https://forum.kiwisdr.com/uploads/Uploader/7b/80fa28d3dcd308246b40e051568882.png
OK, that did a much nicer result. Very nice! I did check the results and found the triangulation point to be approximately 70 miles north of the transmitter towers. I suppose KiwiSDR location information could be inaccurate and other reception anomalies could affect the accuracy as well. Still 70 miles is pretty close.
Ron - KA7U
When zoomed in the site was within the centre circle.
China Radio International Kashi-Saibagh (Coordinates: 39°21'40"N 75°44'43"E).
Dirk SWLJO43
13760 kHz, Kujang (200 kW)
It's a Russian CIS-12 signal on 11175KHz.
Regards,
Martin - G8JNJ
Ron - KA7U
There are problems when stations cross 180 deg even when the map range doesn't. I haven't had time to look into it in detail yet.
http://wikimapia.org/#lang=en&lat=51.807434&lon=3.893216&z=16&m=b
http://wikimapia.org/#lang=en&lat=39.364032&lon=75.713739&z=14&m=b
53.677, 7.612
Chayka transmitter Slonim, 2nd station of RSDN-3 53.132, 25.396111
Wilhelmshaven is the result of a TDoA of a STANAG transmission on 12176KHz USB. Unfortunately I didn't save the setup.
Regards,
Martin - G8JNJ
Istra near Moscow 55°53'03.0"N 36°57'13.0"E
https://www.cia.gov/library/readingroom/docs/CIA-RDP78T04563A001000010071-8.pdf
More Russian sites listed here.
https://www.cia.gov/library/readingroom/docs/CIA-RDP78T05162A000200010022-5.pdf
STANAG on 12668KHz using
http://southwest.ddns.net:8073/?f=12668.41iqz8&pbw=1620&ext=tdoa,lat:43.36,lon:2.17,z:9,map:1,DF0KL,CS5SEL,G8JNJ,LA3SP,SA0CAM,SV8RV,FUG
Regards,
Martin - G8JNJ
Ground Station ID 1 SAN FRANCISCO - CALIFORNIA
Longitude 121 45 34 W Latitude 38 22 48 N
Ground Station ID 2 MOLOKAI - HAWAII
Longitude 157 10 46 W Latitude 21 10 47 N
Ground Station ID 3 REYKJAVIK - ICELAND
Longitude 21 50 59 W Latitude 64 4 47 N
Ground Station ID 4 RIVERHEAD - NEW YORK
Longitude 72 38 22 W Latitude 40 52 47 N
Ground Station ID 5 AUCKLAND - NEW ZEALAND
Longitude 174 48 35 E Latitude 37 1 10 S
Ground Station ID 6 HAT YAI - THAILAND
Longitude 100 23 24 E Latitude 6 56 23 N
Ground Station ID 7 SHANNON - IRELAND
Longitude 8 55 46 W Latitude 52 43 48 N
Ground Station ID 8 JOHANNESBURG - SOUTH AFRICA
Longitude 28 12 35 E Latitude 26 7 46 S
Ground Station ID 9 BARROW - ALASKA
Longitude 156 46 46 W Latitude 71 18 0 N
Ground Station ID 11 ALBROOK - PANAMA CITY
Longitude 79 32 59 W Latitude 8 58 12 N
Ground Station ID 13 SANTA CRUZ - BOLIVIA
Longitude 63 7 46 W Latitude 17 40 11 S
Ground Station ID 14 KRASNOYARSK - RUSSIA
Longitude 92 18 0 E Latitude 56 6 0 N
Ground Station ID 15 AL MUHARRAQ - BAHRAIN
Longitude 50 39 0 E Latitude 26 16 12 N
Ground Station ID 16 AGANA - GUAM
Longitude 144 48 0 E Latitude 13 28 11 N
Ground Station ID 17 CANARIAS - SPAIN
Longitude 15 23 23 W Latitude 27 56 59 N
56.1228, 10.2068
Attachments:
https://forum.kiwisdr.com/uploads/Uploader/c1/34801d613bbfc0e055bdd6a0f6b2b9.png
52.9192, 4.7436
http://southwest.ddns.net:8073/?f=6358.62iqz8&pbw=3160&ext=tdoa,lat:52.18,lon:4.21,z:6,G8JNJ,G0LUJ,F1JEK,DF0KL,DC9FD
PBC also annotated on results map.
Regards,
Martin - G8JNJ
DHO26 German Navy, Near Rostock / Marlow, Germany 54.1438,12.5504
Note - Not operating on LF 53KHz for site reference only
Ron - KA7U