HFU HF Underground
Technical Topics => Propagation => Topic started by: ChrisSmolinski on August 31, 2017, 2310 UTC
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I noticed from Skeezix's graph of DGPS decodes on the 30 Aug 2017 ( https://www.hfunderground.com/board/index.php/topic,36989.0.html ) that he had 3 stations in the middle of the day, here is his graph:
(http://i.imgur.com/sDUiZEU.png)
And the stations close to him, snipped from his decodes, on the graph above he received the 3 closest, which make sense
Count ID ref1 ref2 kHz Baud City Country Lat Lon km Deg
3187 919 308 309 306.0 200 Cardinal, ON Canada 44.783 -75.417 1,417 85
28828 792 136 137 297.0 200 Bobo, MS United States 34.125 -90.696 1,233 168
16265 839 118 119 322.0 100 Youngstown, NY United States 43.239 -78.972 1,170 95
5711 918 310 311 286.0 200 Wiarton, ON Canada 44.75 -81.117 971 87
30709 838 116 117 319.0 200 Detroit, MI United States 42.306 -83.103 883 106
23799 836 112 113 292.0 200 Cheboygan, MI United States 45.656 -84.475 704 81
89661 777 218 219 304.0 200 Mequon, WI United States 43.202 -88.066 474 113
41852 831 102 103 298.0 100 Upper Keweenaw, MI United States 47.233 -88.628 446 55
51124 830 100 101 296.0 100 Wisconsin, Point WI United States 46.708 -92.025 219 30
So I ran a quick recording this afternoon, 1824-1916z to see what I got, here's the results:
Count ID ref1 ref2 kHz Baud City Country Lat Lon km Deg
63 792 136 137 297.0 200 Bobo, MS United States 34.125 -90.696 1,367 247
322 777 218 219 304.0 200 Mequon, WI United States 43.202 -88.066 1,002 296
355 799 044 045 290.0 200 Penobscot, ME United States 44.453 -68.776 858 49
528 778 192 193 292.0 100 Kensington, SC United States 33.491 -79.349 723 198
2745 838 116 117 319.0 200 Detroit, MI United States 42.306 -83.103 590 301
2836 772 198 199 306.0 200 Acushnet, MA United States 41.749 -70.889 561 64
1722 771 196 197 294.0 100 New Bern, NC United States 35.181 -77.059 503 181
2533 844 094 095 324.0 200 Hudson Falls, NY United States 43.272 -73.542 489 35
22 839 118 119 322.0 100 Youngstown, NY United States 43.239 -78.972 427 338
1778 803 006 007 293.0 100 Moriches, NY United States 40.794 -72.756 378 70
1749 806 012 013 289.0 100 Driver, VA United States 36.963 -76.562 307 173
2846 804 008 009 286.0 200 Sandy Hook, NJ United States 40.475 -74.02 266 70
2880 847 058 059 301.0 200 Annapolis, MD United States 39.018 -76.61 82 158
And the graph:
(http://i.imgur.com/YXTQYTw.png)
Obviously there are more nearby stations here, but the maximum range seems further. I'm curious what the cause is of the difference in range. Also you can see how some stations, Bobo and Mequon in particular, were only present for a short time. A longer recording may have included more stations? I need to try an all day recording some time. Ideas?
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Part of my problem here is not as many stations in range during the day anymore. Being in the middle of land, with only the Mississippi River and the Great Lakes that are major navigable waterways, not much reason to have the maritime nav stations here (I would disagree with that assessment, but USCG sees them for aiding ships, not crazy propagation experiments).
Also, my loop is E-W, so I miss out on some of those south of me in the Gulf coast.
For a few months now, I've been meaning to put up another Bonito Boni-Whip in the front tree (which appears to be fairly free of RFI at this time) and see if that tiny little omni does better than the ALA100LN. Putting it up in the tree is easy, its digging the trench for the coax that really don't want to do.