HFU HF Underground
Loggings => DGPS => Topic started by: skeezix on November 21, 2016, 0509 UTC
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The S Africa one is definitely a false decode. The rest seem good.
Nothing terribly exciting in the data here, except for perhaps Panama. On the other hand, the graph is interesting, specifically the 1400-1700 UTC (0800-1100 CST, 0900-1200 EST) catch of NC, SC, and VA. Wasn't expecting them to be coming in during the morning like this, especially since they're off to the side of the loop. The SDR will continue to record continuously for a while and we'll see how the upcoming days are.
Count ID ref1 ref2 kHz Baud City Country Lat Lon km Deg
4 203 223 243 301.0 100 Cape Aghulas South Africa -34.838 20.021 14,392 103
5 907 304 305 320.0 200 Richmond, BC Canada 49.114 -123.183 2,283 292
7 919 308 309 306.0 200 Cardinal, ON Canada 44.783 -75.417 1,417 85
11 839 118 119 322.0 100 Youngstown, NY United States 43.239 -78.972 1,170 95
11 885 270 271 292.0 100 Cape Mendocino, CA United States 40.447 -124.405 2,563 270
96 799 044 045 290.0 200 Penobscot, ME United States 44.453 -68.776 1,942 83
174 886 272 273 287.0 100 Fort Stevens, OR United States 46.208 -123.96 2,363 284
178 918 310 311 286.0 200 Wiarton, ON Canada 44.75 -81.117 971 87
198 830 100 101 296.0 100 Wisconsin, Point WI United States 46.708 -92.025 219 30
203 881 262 263 302.0 100 Point Loma, CA United States 32.677 -117.25 2,462 244
451 847 058 059 301.0 200 Annapolis, MD United States 39.018 -76.61 1,538 110
536 804 008 009 286.0 200 Sandy Hook, NJ United States 40.475 -74.02 1,659 101
924 927 316 317 309.0 200 Lauzon, QC Canada 46.821 -71.165 1,729 75
935 870 170 171 309.0 200 Reedy Point, DE United States 39.569 -75.572 1,585 106
970 816 032 033 304.0 100 Aransas Pass, TX United States 27.842 -97.065 1,936 191
1375 871 172 173 300.0 100 Appleton, WA United States 45.792 -121.332 2,168 282
1966 929 312 313 296.0 200 St Jean Richelieu, QC Canada 45.324 -73.317 1,574 82
2412 764 210 211 314.0 200 Lincoln, CA United States 38.855 -121.361 2,395 263
2739 972 901 902 302.0 200 Miraflores Panama 8.993 -79.585 4,220 157
6841 809 018 019 289.0 100 Cape Canaveral, FL United States 28.467 -80.554 2,162 144
9529 844 094 095 324.0 200 Hudson Falls, NY United States 43.272 -73.542 1,595 90
10559 808 016 017 314.0 200 Card Sound, FL United States 25.442 -80.452 2,468 147
10665 772 198 199 306.0 200 Acushnet, MA United States 41.749 -70.889 1,852 93
13233 778 192 193 292.0 100 Kensington, SC United States 33.491 -79.349 1,759 132
15625 836 112 113 292.0 200 Cheboygan, MI United States 45.656 -84.475 704 81
22632 806 012 013 289.0 100 Driver, VA United States 36.963 -76.562 1,670 116
31029 771 196 197 294.0 100 New Bern, NC United States 35.181 -77.059 1,765 123
42383 865 160 161 320.0 200 Millers Ferry, AL United States 32.095 -87.397 1,528 158
44145 828 246 247 301.0 100 Angleton, TX United States 29.301 -95.484 1,756 187
50191 814 028 029 293.0 200 English Turn, LA United States 29.886 -89.947 1,709 169
56159 838 116 117 319.0 200 Detroit, MI United States 42.306 -83.103 883 106
58037 827 244 245 312.0 200 Tampa, FL United States 27.85 -82.543 2,138 149
69231 869 168 169 290.0 200 Louisville, KY United States 38.018 -85.31 1,030 136
70474 831 102 103 298.0 100 Upper Keweenaw, MI United States 47.233 -88.628 446 55
99654 792 136 137 297.0 200 Bobo, MS United States 34.125 -90.696 1,233 168
110815 866 162 163 299.0 200 Sallisaw, OK United States 35.369 -94.817 1,078 187
134593 777 218 219 304.0 200 Mequon, WI United States 43.202 -88.066 474 113
139271 862 154 155 322.0 200 St Louis, MO United States 38.619 -89.764 773 156
141814 863 156 157 311.0 200 Rock Island IL United States 42.02 -90.231 421 141
142116 864 158 159 317.0 200 St Paul [Alma], MN United States 44.306 -91.906 144 122
(http://i.imgur.com/LUgeEAz.png)
Perseus SDR with Wellbrook ALA1530S+ loop oriented N-S
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Nothing terribly exciting in the data here, except for perhaps Panama. On the other hand, the graph is interesting, specifically the 1400-1700 UTC (0800-1100 CST, 0900-1200 EST) catch of NC, SC, and VA. Wasn't expecting them to be coming in during the morning like this, especially since they're off to the side of the loop. The SDR will continue to record continuously for a while and we'll see how the upcoming days are.
Panama is regarded as a pest here :) There is a second station in Panama (Gatun 307 kHz) that I have logged in the past, but not recently. I wonder if it is off the air?
I've noticed interesting daytime catches as well, where the signal from one or more stations will suddenly appear for a few minutes, then vanish again. It reminds me of HF propagation on 43 meters, when after the band has gone long, a station will suddenly appear again with presumably NVIS propagation for a few minutes, usually with a strong signal, then vanish again. Both the fade in and out are very quick in that case, almost instantaneous.
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Now with more data- Nov 19, 2016 1741 to Nov 23, 2016 1416
Danang and Capt Aghulas are invalid, but Upolu Point is probably good.
Count ID ref1 ref2 kHz Baud City Country Lat Lon km Deg
5 879 258 259 286.0 100 Upolu Point, Hi Hawaii 20.257 -155.885 6,285 266
6 748 199 200 299.0 200 Danang Vietnam 38.873 121.831 10,043 333
6 897 294 295 313.0 100 Kodiak, AK Alaska 57.621 -152.201 4,167 311
9 203 223 243 301.0 100 Cape Aghulas South Africa -34.838 20.021 14,392 103
22 944 342 343 310.0 200 Cape Norman, NL Canada 51.509 -55.831 2,842 62
28 803 006 007 293.0 100 Moriches, NY United States 40.794 -72.756 1,743 98
35 885 270 271 292.0 100 Cape Mendocino, CA United States 40.447 -124.405 2,563 270
39 888 276 277 302.0 100 Whidbey Island, WA United States 48.322 -122.706 2,249 290
44 939 326 327 295.0 200 Partridge Island, NB Canada 45.239 -66.056 2,138 80
54 906 306 307 300.0 200 Sandspit, BC Canada 53.242 -131.814 2,898 302
68 839 118 119 322.0 100 Youngstown, NY United States 43.239 -78.972 1,170 95
100 909 300 301 309.0 200 Alert Bay, BC Canada 50.589 -126.93 2,554 296
101 942 340 341 288.0 200 Cape Ray, NL Canada 47.636 -59.241 2,621 71
304 799 044 045 290.0 200 Penobscot, ME United States 44.453 -68.776 1,942 83
316 919 308 309 306.0 200 Cardinal, ON Canada 44.783 -75.417 1,417 85
592 907 304 305 320.0 200 Richmond, BC Canada 49.114 -123.183 2,283 292
839 886 272 273 287.0 100 Fort Stevens, OR United States 46.208 -123.96 2,363 284
1099 881 262 263 302.0 100 Point Loma, CA United States 32.677 -117.25 2,462 244
1307 918 310 311 286.0 200 Wiarton, ON Canada 44.75 -81.117 971 87
1562 891 282 283 295.0 100 Level Island, AK Alaska 56.467 -133.098 3,014 309
2638 870 170 171 309.0 200 Reedy Point, DE United States 39.569 -75.572 1,585 106
2862 847 058 059 301.0 200 Annapolis, MD United States 39.018 -76.61 1,538 110
3114 804 008 009 286.0 200 Sandy Hook, NJ United States 40.475 -74.02 1,659 101
3329 871 172 173 300.0 100 Appleton, WA United States 45.792 -121.332 2,168 282
3993 816 032 033 304.0 100 Aransas Pass, TX United States 27.842 -97.065 1,936 191
5463 929 312 313 296.0 200 St Jean Richelieu, QC Canada 45.324 -73.317 1,574 82
5895 927 316 317 309.0 200 Lauzon, QC Canada 46.821 -71.165 1,729 75
7008 764 210 211 314.0 200 Lincoln, CA United States 38.855 -121.361 2,395 263
9026 972 901 902 302.0 200 Miraflores Panama 8.993 -79.585 4,220 157
21090 809 018 019 289.0 100 Cape Canaveral, FL United States 28.467 -80.554 2,162 144
33655 778 192 193 292.0 100 Kensington, SC United States 33.491 -79.349 1,759 132
38214 772 198 199 306.0 200 Acushnet, MA United States 41.749 -70.889 1,852 93
39891 844 094 095 324.0 200 Hudson Falls, NY United States 43.272 -73.542 1,595 90
40737 808 016 017 314.0 200 Card Sound, FL United States 25.442 -80.452 2,468 147
60223 806 012 013 289.0 100 Driver, VA United States 36.963 -76.562 1,670 116
63034 836 112 113 292.0 200 Cheboygan, MI United States 45.656 -84.475 704 81
88171 771 196 197 294.0 100 New Bern, NC United States 35.181 -77.059 1,765 123
91560 830 100 101 296.0 100 Wisconsin, Point WI United States 46.708 -92.025 219 30
111144 865 160 161 320.0 200 Millers Ferry, AL United States 32.095 -87.397 1,528 158
117879 828 246 247 301.0 100 Angleton, TX United States 29.301 -95.484 1,756 187
152023 814 028 029 293.0 200 English Turn, LA United States 29.886 -89.947 1,709 169
166539 838 116 117 319.0 200 Detroit, MI United States 42.306 -83.103 883 106
172513 827 244 245 312.0 200 Tampa, FL United States 27.85 -82.543 2,138 149
186603 869 168 169 290.0 200 Louisville, KY United States 38.018 -85.31 1,030 136
193797 831 102 103 298.0 100 Upper Keweenaw, MI United States 47.233 -88.628 446 55
271416 792 136 137 297.0 200 Bobo, MS United States 34.125 -90.696 1,233 168
290238 866 162 163 299.0 200 Sallisaw, OK United States 35.369 -94.817 1,078 187
366913 777 218 219 304.0 200 Mequon, WI United States 43.202 -88.066 474 113
389324 862 154 155 322.0 200 St Louis, MO United States 38.619 -89.764 773 156
392129 863 156 157 311.0 200 Rock Island IL United States 42.02 -90.231 421 141
397815 864 158 159 317.0 200 St Paul [Alma], MN United States 44.306 -91.906 144 122
(http://i.imgur.com/5u7JTlO.png)
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Nice catch getting Hawaii!
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During this long stretch, I was surprised for Hawaii. My ALA1530S+ is N-S and according to the calculations from DGPS, Hawaii is at 266 deg from here, which puts it 94 degrees on the loop. This loop is around 30 dBm lower off the side. I'll take it. I did try putting the loop E-W a while back, but lots of noise. Can't remember where 286 kHz was with respect to the noise, but will be trying some things here.
Upolu Point, HI
Monday, November 21, 2016 10:07:15
Monday, November 21, 2016 10:07:17
Monday, November 21, 2016 10:07:25
Monday, November 21, 2016 10:07:27
Tuesday, November 22, 2016 09:00:13
Kodiak, AK
Tuesday, November 22, 2016 10:15:14
Tuesday, November 22, 2016 10:15:47
Tuesday, November 22, 2016 11:51:56
Tuesday, November 22, 2016 11:53:54
Tuesday, November 22, 2016 11:55:39
Tuesday, November 22, 2016 11:56:09
Once we get to the ones with at least double-digit decodes, those are all valid. Some nice stations in there too.
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I suspect there's lots of competing factors involved with getting the DGPS stations. Not only do you want a good signal from the desired station, but you don't want to get another station on the same frequency. This is where recording the entire night helps, you get those brief windows when the unwanted station fades out, bringing in decodes from the desired stations. It's interesting to see how much the results vary from night to night, even for just one station.
How directional is the ALA1530S down at 300 kHz?
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Did a rough measurement around 24 Nov 2016 UTC 0025 with the Perseus and Wellbrook ALA1530S+ on a TV rotor near ground level in a shed out in the back yard.
A local NDB station on 400 kHz (PPI) was about 30 dB between max & min.
On the DGPS stas around 300 kHz:
297 kHz (792, MS)
298 kHz (831, MI)
299 kHz (866, OK)
304 kHz (777, WI)
317 kHz (864, WI)
All except 831 were 30 dB. 831 was 20 dB. Roughly. 831 was noticeably less directional.
The method used for PPI was to put a marker on the carrier and tune for max/min.
Method for the DGPS stations was to watch visually for max & min. The signal is too wide and variable for using the marker as I did with PPI. While not precise, but I could easily tell within 5 dB (the difference of 831 of 20 dB vs the rest was clear).