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Author Topic: Daytime Propagation on DGPS  (Read 592 times)

Offline ChrisSmolinski

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Daytime Propagation on DGPS
« on: August 31, 2017, 2310 UTC »
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:



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:



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?
Chris Smolinski
Westminster, MD
eQSLs appreciated! csmolinski@blackcatsystems.com
NRD 545 / netSDR / AFE822x / AirSpy HF+ / KiwiSDR / 670 ft horizontal loop / 500 ft northeast beverage / 270 ft west-south-west beverage / 300 ft south beverage / 43m / 20m / 10m  dipoles / Crossed Parallel Loop

Offline skeezix

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Re: Daytime Propagation on DGPS
« Reply #1 on: September 01, 2017, 0021 UTC »
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.

Minneapolis, MN