DGPS Logs Sep 15 2019 UTC 2312 - Sep 16 2019 UTC 2317 (AFE822x)

[skeezix]

Sandspit was questionable two nights ago, but absolutely no question of its propagation last night.

Dhazari is interesting. It looks like an image of Alert Bay. Decodes are of the same time (as seen in the graph), Alert Bay is 200 bps, and can be transmitting with an ID of 301. So for some reason, there's a 4 kHz image of Alert Bay.

Back on Aug 31 in the early morning hours, 638 decodes from Alert Bay, no mention of Dhazari.
On Sept 4th, there were only 11 decodes from Alert Bay, none from Dhazari.
On Sept 7th, there were 18 decodes from Alert Bay, none from Dhazari.
No decodes from Alert Bay nor Dhazari Sept 8th - Sept 11th.
Sept 12th is when Dhazari shows up for the first time with 2 decodes. Nothing listed for Alert Bay.
Then on Sept 14th with increased decodes from Alert Bay, the doppelgänger on 305.0 kHz is clear.
No Alert Bay nor Dhazari on the 15th. Unknown if simply lack of propagation or transmitter problems.
Tonight on the 16th, its very obvious.

Unknowns
- Are the decodes on 305.0 kHz a transmission problem or something within my receiving system
- Did it switch to ID 301 after the 7th and thus why its showing up (in combination with some tx or rx problem)


Additional testing
Does this also appear on 313.0 kHz? While there are no listed decodes, there are also no stations on 313.0 kHz with an ID of 301, so it would be buried in the UNID list, which I do not normally check. I'll run additional decoding during the window of interest and see what is in the UNID list. May even tinker with the list of stations to add test stations with ID of 301 on other freqs to see how this wide thing is spreading.



Count    ID   ref1 ref2 kHz   Baud City                           Country              Lat      Lon      km     Deg
766      001  301  001  305.0 200  Dhazari                        Bangladesh           22.165   92.055   12,525 354
4        614  628  629  295.0 200  Shitang                        China                28.267   121.617  11,127 329
4        001  001  001  286.0 200  Semikarakorsk?                 Russia               47.543   40.876   8,801  29 
3        897  294  295  313.0 100  Kodiak, AK                     Alaska               57.621   -152.201 4,167  311
47       940  338  339  315.0 200  Cape Race, NL                  Canada               46.661   -53.075  3,098  72 
40       891  282  283  295.0 100  Level Island, AK               Alaska               56.467   -133.098 3,014  309
108      889  278  279  323.0 100  Annette Island, AK             Alaska               55.069   -131.6   2,901  306
2650     906  306  307  300.0 200  Sandspit, BC                   Canada               53.242   -131.814 2,898  302
541      944  342  343  310.0 200  Cape Norman, NL                Canada               51.509   -55.831  2,842  62 
4        942  340  341  288.0 200  Cape Ray, NL                   Canada               47.636   -59.241  2,621  71 
743      909  300  301  309.0 200  Alert Bay, BC                  Canada               50.589   -126.93  2,554  296
137      908  302  303  315.0 200  Tofino [Amphitrite Point], BC  Canada               48.931   -125.545 2,456  292
12311    907  304  305  320.0 200  Richmond, BC                   Canada               49.114   -123.183 2,283  292
76       935  334  335  312.0 200  Western Head, NS               Canada               43.993   -64.67   2,273  83 
107      936  332  333  319.0 200  Point Escuminac, NB            Canada               47.075   -64.8    2,210  74 
1548     799  044  045  290.0 200  Penobscot, ME                  United States        44.453   -68.776  1,942  83 
14253    772  198  199  306.0 200  Acushnet, MA                   United States        41.749   -70.889  1,852  93 
213      926  318  319  300.0 200  Riviere du Loop, QC            Canada               47.762   -69.606  1,846  72 
5695     803  006  007  293.0 100  Moriches, NY                   United States        40.794   -72.756  1,743  98 
9900     927  316  317  309.0 200  Lauzon, QC                     Canada               46.821   -71.165  1,729  75 
4468     814  028  029  293.0 200  English Turn, LA               United States        29.886   -89.947  1,709  169
1250     804  008  009  286.0 200  Sandy Hook, NJ                 United States        40.475   -74.02   1,659  101
22089    844  094  095  324.0 200  Hudson Falls, NY               United States        43.272   -73.542  1,595  90 
24764    929  312  313  296.0 200  St Jean Richelieu, QC          Canada               45.324   -73.317  1,574  82 
2373     919  308  309  306.0 200  Cardinal, ON                   Canada               44.783   -75.417  1,417  85 
2506     839  118  119  322.0 100  Youngstown, NY                 United States        43.239   -78.972  1,170  95 
11252    918  310  311  286.0 200  Wiarton, ON                    Canada               44.75    -81.117  971    87 
24883    838  116  117  319.0 200  Detroit, MI                    United States        42.306   -83.103  883    106
19496    836  112  113  292.0 200  Cheboygan, MI                  United States        45.656   -84.475  704    81 
39382    831  102  103  298.0 100  Upper Keweenaw, MI             United States        47.233   -88.628  446    55 



Note: The following DGPS beacon signals were terminated on September 30, 2018.

    Pigeon Point, CA (287 KHZ, Site ID 883)
    Robinson Point, WA (323 KHZ, Site ID 887)
    Annapolis, MD (301 KHZ, Site ID 847)
    Bobo, MS (297 KHZ, Site ID 792)
    New Bern, NC (294 KHZ, Site ID 771)

For inquiries, please contact the Navigation Information Service (NIS) via our Contact Us page or via phone at 703-313-5900.

CURRENT DGPS ADVISORIES FOR 16 Sep 2019

Site Name    Site Id    BNM #    OUTAGE MESSAGE

SCHEDULED / UNSCHEDULED OUTAGES

Level Island   891   0186-19   
BROADCAST SITE IS UNUSABLE AS OF 08/15/2019 23:12 Z UNTIL FURTHER NOTICE.

Potato Point   895   0201-19   
BROADCAST SITE WILL BE UNUSABLE FROM 09/30/2019 12:00 Z TO 09/30/2019 20:00 Z.

Cheboygan   836   0182-19   
BROADCAST SITE WILL BE UNUSABLE FROM 09/24/2019 14:00 Z TO 09/24/2019 15:00 Z.

Angleton   828   0158-19   
BROADCAST SITE IS UNUSABLE AS OF 07/09/2019 23:19 Z UNTIL FURTHER NOTICE.

Mequon   777   0136-19   
BROADCAST SITE IS UNUSABLE AS OF 06/22/2019 22:39 Z UNTIL FURTHER NOTICE.


CANADIAN DGPS OUTAGES

CURRENT CANADIAN DGPS ADVISORIES FOR 16 Sep 2019

Site Name    Site Id    BNM #    OUTAGE MESSAGE

SCHEDULED / UNSCHEDULED OUTAGES

No current advisories.


_{AFE822x v2.0 SDR with 43' Wellbrook ALA100LN loop oriented E-W}

[ChrisSmolinski]

What is the center frequency of your SDR recording?

[skeezix]

307 kHz.

[ChrisSmolinski]

307 kHz.

Alert Bay is 309 kHz
Your center frequency is 307 kHz
So I suspect Dhazari on 305 kHz is an image. 309-307=2, 307-305=2.

[skeezix]

When I typed 307, I thought the same thing, but its new behavior and never have seen it before.

Checked the waterfall this morning- mirror image for a bunch of signals around the center. Stopped & restarted Studio1, no change. Stopped it, power cycled the AFE822x, started it, no change. Checked settings for the AFE822x, its fine. Then on a whim decided to reboot it. Yup, that fixed it. Waterfall looks normal and not mirrored. winderz... egad what a pile.

[ChrisSmolinski]

All software is broken, some software is useful.

Glad you got it fixed.

[skeezix]

Isn't that the truth.

Well it's working now, or I should say, it was working a few minutes after the reboot. Will it stay working or not is the question. When it comes do winderz, my confidence is about as low as it gets.

However, only have about a year left of the U.S. stations.