HFU HF Underground
Loggings => DGPS => Topic started by: ChrisSmolinski on October 27, 2017, 1248 UTC
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What's the deal with Soh and Pulau Satumu (Raffles) ?? These were presumably decodes with a Ref ID of 000, which is why both stations appeared. I've seen them before this way, usually 2 or 3 decodes widely spaced over the night. But here's the 4 decodes from last night:
Friday, October 27, 2017 03:42:55
Friday, October 27, 2017 03:43:01
Friday, October 27, 2017 03:43:06
Friday, October 27, 2017 03:43:12
These are not widely spaced. They are exactly what you would expect from a brief opening. Upper Keweenaw is the dominant station on 298 kHz. There is also Hartlen Point, NS which is 100 baud. Could it have appeared with a Ref ID of zero for 4 decodes over 17 seconds? Those two foreign stations are supposed to have two non zero Ref IDs, apparently when the pdf file was converted to text for ADGPS they got dropped. I need to look into this further.
Count ID ref1 ref2 kHz Baud City Country Lat Lon km Deg
3 152 494 495 310.0 200 Marbat Oman 16.967 54.751 11,971 49
4 746 000 132 298.0 200 Pulau Satumu (Raffles) Singapore 1.165 103.746 15,471 359
4 669 000 738 298.0 200 Soh South Korea 34.096 125.1 11,501 341
23 883 266 267 287.0 100 Pigeon Point, CA United States 37.189 -122.394 3,923 281
41 918 310 311 286.0 200 Wiarton, ON Canada 44.75 -81.117 656 330
78 764 210 211 314.0 200 Lincoln, CA United States 38.855 -121.361 3,782 283
160 907 304 305 320.0 200 Richmond, BC Canada 49.114 -123.183 3,753 302
337 937 330 331 298.0 200 Hartlen Point, NS Canada 44.583 -63.45 1,238 60
382 828 246 247 301.0 100 Angleton, TX United States 29.301 -95.484 2,046 241
401 919 308 309 306.0 200 Cardinal, ON Canada 44.783 -75.417 579 12
500 881 262 263 302.0 100 Point Loma, CA United States 32.677 -117.25 3,666 271
729 871 172 173 300.0 100 Appleton, WA United States 45.792 -121.332 3,637 296
918 836 112 113 292.0 200 Cheboygan, MI United States 45.656 -84.475 901 320
2346 886 272 273 287.0 100 Fort Stevens, OR United States 46.208 -123.96 3,834 297
2537 814 028 029 293.0 200 English Turn, LA United States 29.886 -89.947 1,608 231
2778 809 018 019 289.0 100 Cape Canaveral, FL United States 28.467 -80.554 1,292 196
2867 935 334 335 312.0 200 Western Head, NS Canada 43.993 -64.67 1,124 61
3112 934 336 337 307.0 200 Fox Island, NS Canada 45.361 -61.097 1,442 59
4215 830 100 101 296.0 100 Wisconsin, Point WI United States 46.708 -92.025 1,444 308
6241 940 338 339 315.0 200 Cape Race, NL Canada 46.661 -53.075 2,076 60
7706 944 342 343 310.0 200 Cape Norman, NL Canada 51.509 -55.831 2,091 44
9057 972 901 902 302.0 200 Miraflores Panama 8.993 -79.585 3,425 185
15667 971 903 904 307.0 200 Gatun Panama 9.261 -79.937 3,398 186
24854 806 012 013 289.0 100 Driver, VA United States 36.963 -76.562 307 173
27250 839 118 119 322.0 100 Youngstown, NY United States 43.239 -78.972 427 338
28186 831 102 103 298.0 100 Upper Keweenaw, MI United States 47.233 -88.628 1,257 316
28388 803 006 007 293.0 100 Moriches, NY United States 40.794 -72.756 378 70
29761 925 320 321 313.0 200 Moise, QC Canada 50.202 -66.119 1,443 32
30937 778 192 193 292.0 100 Kensington, SC United States 33.491 -79.349 723 198
32279 771 196 197 294.0 100 New Bern, NC United States 35.181 -77.059 503 181
38001 929 312 313 296.0 200 St Jean Richelieu, QC Canada 45.324 -73.317 693 24
39587 926 318 319 300.0 200 Riviere du Loop, QC Canada 47.762 -69.606 1,073 31
40086 939 326 327 295.0 200 Partridge Island, NB Canada 45.239 -66.056 1,085 52
41428 942 340 341 288.0 200 Cape Ray, NL Canada 47.636 -59.241 1,671 52
42455 827 244 245 312.0 200 Tampa, FL United States 27.85 -82.543 1,414 203
46247 808 016 017 314.0 200 Card Sound, FL United States 25.442 -80.452 1,619 193
48339 927 316 317 309.0 200 Lauzon, QC Canada 46.821 -71.165 920 29
49728 847 058 059 301.0 200 Annapolis, MD United States 39.018 -76.61 82 158
50455 777 218 219 304.0 200 Mequon, WI United States 43.202 -88.066 1,002 296
50505 772 198 199 306.0 200 Acushnet, MA United States 41.749 -70.889 561 64
51182 799 044 045 290.0 200 Penobscot, ME United States 44.453 -68.776 858 49
51374 838 116 117 319.0 200 Detroit, MI United States 42.306 -83.103 590 301
51419 804 008 009 286.0 200 Sandy Hook, NJ United States 40.475 -74.02 266 70
51863 792 136 137 297.0 200 Bobo, MS United States 34.125 -90.696 1,367 247
52144 844 094 095 324.0 200 Hudson Falls, NY United States 43.272 -73.542 489 35
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I added some diagnostics output to ADGPS and verified the received messages did indeed have Ref ID 000.
Here are all the decodes from Hartlen Point, NS:
Friday, October 27, 2017 00:07:10
Friday, October 27, 2017 00:09:41
Friday, October 27, 2017 00:09:42
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I'm convinced that these are just corrupted decodes. I think it's just coincidental that they occurred around the same time. Some big wide noise pulse zapped all the bits in the Ref ID to zero. I'm going to go through the entire station listing file by hand to check and correct any additional stations that have entries of zero for the Ref ID. That may cut down on some of the bogus decodes.
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I've had those two show up together before, with the same times. I don't think four in a row like that, maybe 2 or 3 with some spacing.
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Yes, the four in a row is really surprising. But those four decodes all had a transmitted ID of 000 which is really not valid for them, or any other station on that frequency (or maybe anywhere?). I guess that tells us that with the millions of potential decodes checked each night by ADGPS (I really should do the math to see how many) you do get some strange sequences. It's like if you flip a coin a bunch of times, eventually you will get ten heads in a row.