HFU HF Underground
Loggings => DGPS => Topic started by: skeezix on September 05, 2017, 0013 UTC
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Bobo showed up for 37307 decodes at 169 degrees, English turn for 664 decodes at 169 degrees, 4224 from Angleton at 187 degrees. These are very close to the minimum of the loop. Yet, nothing from Aransas Pass, which is back on the air. High angle of incidence, perhaps?
Cape Race
Monday, September 4, 2017 05:57:44
Level Island
Monday, September 4, 2017 10:08:38
Sterlegov Cape
Monday, September 4, 2017 21:12:15
Count ID ref1 ref2 kHz Baud City Country Lat Lon km Deg
1 203 223 243 301.0 100 Cape Aghulas South Africa -34.838 20.021 14,392 103
1 111 422 423 315.0 100 Pondicherry Lt India 11.925 79.843 13,649 8
1 001 301 001 305.0 200 Dhazari Bangladesh 22.165 92.055 12,525 354
1 611 622 623 304.0 200 Haozhi Gang China 32.017 121.717 10,743 331
1 645 690 691 320.0 200 Nagoya Japan 35.042 136.858 9,777 321
1 003 003 001 318.5 100 Sterlegov Cape Russia [East] 75.383 88.75 6,627 359
132 879 258 259 286.0 100 Upolu Point, Hi Hawaii 20.257 -155.885 6,285 266
1 940 338 339 315.0 200 Cape Race, NL Canada 46.661 -53.075 3,098 72
1 891 282 283 295.0 100 Level Island, AK Alaska 56.467 -133.098 3,014 309
565 942 340 341 288.0 200 Cape Ray, NL Canada 47.636 -59.241 2,621 71
120 885 270 271 292.0 100 Cape Mendocino, CA United States 40.447 -124.405 2,563 270
1 883 266 267 287.0 100 Pigeon Point, CA United States 37.189 -122.394 2,561 260
8 909 300 301 309.0 200 Alert Bay, BC Canada 50.589 -126.93 2,554 296
13 808 016 017 314.0 200 Card Sound, FL United States 25.442 -80.452 2,468 147
5 881 262 263 302.0 100 Point Loma, CA United States 32.677 -117.25 2,462 244
425 908 302 303 315.0 200 Tofino [Amphitrite Point], BC Canada 48.931 -125.545 2,456 292
15783 764 210 211 314.0 200 Lincoln, CA United States 38.855 -121.361 2,395 263
3840 886 272 273 287.0 100 Fort Stevens, OR United States 46.208 -123.96 2,363 284
8136 907 304 305 320.0 200 Richmond, BC Canada 49.114 -123.183 2,283 292
1 888 276 277 302.0 100 Whidbey Island, WA United States 48.322 -122.706 2,249 290
112 887 274 275 323.0 200 Robinson Point, WA United States 47.392 -122.38 2,230 287
27 936 332 333 319.0 200 Point Escuminac, NB Canada 47.075 -64.8 2,210 74
122 871 172 173 300.0 100 Appleton, WA United States 45.792 -121.332 2,168 282
587 809 018 019 289.0 100 Cape Canaveral, FL United States 28.467 -80.554 2,162 144
3 939 326 327 295.0 200 Partridge Island, NB Canada 45.239 -66.056 2,138 80
22906 827 244 245 312.0 200 Tampa, FL United States 27.85 -82.543 2,138 149
10891 799 044 045 290.0 200 Penobscot, ME United States 44.453 -68.776 1,942 83
6160 772 198 199 306.0 200 Acushnet, MA United States 41.749 -70.889 1,852 93
12871 771 196 197 294.0 100 New Bern, NC United States 35.181 -77.059 1,765 123
967 778 192 193 292.0 100 Kensington, SC United States 33.491 -79.349 1,759 132
4224 828 246 247 301.0 100 Angleton, TX United States 29.301 -95.484 1,756 187
4116 803 006 007 293.0 100 Moriches, NY United States 40.794 -72.756 1,743 98
11726 927 316 317 309.0 200 Lauzon, QC Canada 46.821 -71.165 1,729 75
664 814 028 029 293.0 200 English Turn, LA United States 29.886 -89.947 1,709 169
11508 806 012 013 289.0 100 Driver, VA United States 36.963 -76.562 1,670 116
6468 804 008 009 286.0 200 Sandy Hook, NJ United States 40.475 -74.02 1,659 101
27233 844 094 095 324.0 200 Hudson Falls, NY United States 43.272 -73.542 1,595 90
86 929 312 313 296.0 200 St Jean Richelieu, QC Canada 45.324 -73.317 1,574 82
11214 847 058 059 301.0 200 Annapolis, MD United States 39.018 -76.61 1,538 110
1 865 160 161 320.0 200 Millers Ferry, AL United States 32.095 -87.397 1,528 158
1066 919 308 309 306.0 200 Cardinal, ON Canada 44.783 -75.417 1,417 85
37307 792 136 137 297.0 200 Bobo, MS United States 34.125 -90.696 1,233 168
15228 839 118 119 322.0 100 Youngstown, NY United States 43.239 -78.972 1,170 95
1234 918 310 311 286.0 200 Wiarton, ON Canada 44.75 -81.117 971 87
28827 838 116 117 319.0 200 Detroit, MI United States 42.306 -83.103 883 106
20450 836 112 113 292.0 200 Cheboygan, MI United States 45.656 -84.475 704 81
102096 777 218 219 304.0 200 Mequon, WI United States 43.202 -88.066 474 113
49343 831 102 103 298.0 100 Upper Keweenaw, MI United States 47.233 -88.628 446 55
51447 830 100 101 296.0 100 Wisconsin, Point WI United States 46.708 -92.025 219 30
(https://i.imgur.com/vnwRVFd.png)
CURRENT DGPS ADVISORIES FOR 04 Sep 2017
Site Name Site Id BNM # OUTAGE MESSAGE
SCHEDULED / UNSCHEDULED OUTAGES
Biorka 890 0317-17
BROADCAST SITE WILL BE UNUSABLE FROM 09/07/2017 16:00 Z TO 09/09/2017 16:00 Z.
Penobscot 799 0337-17
BROADCAST SITE WILL BE UNUSABLE FROM 09/20/2017 12:00 Z TO 09/21/2017 22:00 Z.
Aransas Pass 816 0323-17
BROADCAST SITE IS UNUSABLE AS OF 08/25/2017 21:29 Z UNTIL FURTHER NOTICE.
Cape Mendocino 885 0336-17
BROADCAST SITE STATUS IS UNCONFIRMED DUE TO NETWORK OUTAGE AS OF 09/02/2017 23:29 Z UNTIL FURTHER NOTICE.
Angleton 828 0325-17
BROADCAST SITE STATUS IS UNCONFIRMED DUE TO NETWORK OUTAGE AS OF 08/27/2017 00:46 Z UNTIL FURTHER NOTICE.
New Bern 771 0321-17
BROADCAST SITE WILL BE UNUSABLE FROM 09/21/2017 10:00 Z TO 09/21/2017 22:00 Z.
Sandy Hook 804 0320-17
BROADCAST SITE WILL BE UNUSABLE FROM 09/05/2017 12:00 Z TO 09/06/2017 20:00 Z.
Robinson Point 887 0334-17
BROADCAST SITE WILL BE UNUSABLE FROM 09/19/2017 16:00 Z TO 09/19/2017 20:00 Z.
Whidbey Island 888 0333-17
BROADCAST SITE WILL BE UNUSABLE FROM 09/20/2017 17:00 Z TO 09/20/2017 21:00 Z.
CANADIAN DGPS OUTAGES
CURRENT CANADIAN DGPS ADVISORIES FOR 04 Sep 2017
Site Name Site Id BNM # OUTAGE MESSAGE
SCHEDULED / UNSCHEDULED OUTAGES
Western Head N011-17
BROADCAST SITE IS OFF AIR AS OF 07/25/2017 15:00 Z UNTIL FURTHER NOTICE.
AFE822x v2.0 SDR with 43' Wellbrook ALA100LN loop oriented E-W
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Bobo showed up for 37307 decodes at 169 degrees, English turn for 664 decodes at 169 degrees, 4224 from Angleton at 187 degrees. These are very close to the minimum of the loop. Yet, nothing from Aransas Pass, which is back on the air. High angle of incidence, perhaps?
I only had a few (39?) decodes from Aransas Pass that night, and IIRC it they were during a brief period of time. None so far this past night, and the decodes are already to 1010z, perhaps they are still doing work to the site?
Regarding loops at LW, my PVC loop will generate nulls, but they are very sharp, and unstable. Within a few minutes what was nulled is no longer nulled, and is not that much weaker vs the loop maximum. I need to re-adjust the bearing to null again. And some stations are much more difficult to null than others, which may indeed be the angle of incidence. If it is too high, and not directly on the face of the loop, I don't see how electrically you can get a good null.
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The reception of Bobo and English Turn, speculation -
On p903 of An analysis of continuous records of field intensity at broadcast frequencies (http://nistdigitalarchives.contentdm.oclc.org/cdm/compoundobject/collection/p13011coll6/id/137639/rec/5), they have a formula with max sky wave field at 580 km. And they correlate that to their graph with peaks at 500 km, 1000 km, 1500 km (read the article for further context).
Taking a look at the distance to Bobo & English Turn, 1,233 km and 1,709, respectively. That are approximately 2x and 3x 600km. Perhaps this is a coincidence and not related specifically to distance.
Will need to look for other stations within ~100km(?) of those two.