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Loggings => DGPS => Topic started by: skeezix on July 06, 2017, 0024 UTC

Title: DGPS Logs Jul 4, 2017 UTC 2334 - Jul 5, 2017 UTC 2340 (AFE822x)
Post by: skeezix on July 06, 2017, 0024 UTC: Pretty bad night.

Cape Mendocino
Wednesday, July 5, 2017 10:11:32

Fort Stevens
Wednesday, July 5, 2017 10:24:59 Wednesday, July 5, 2017 10:28:05 Wednesday, July 5, 2017 10:34:37 Wednesday, July 5, 2017 10:41:42

Penobscot
Wednesday, July 5, 2017 06:32:43 Wednesday, July 5, 2017 08:11:42 Wednesday, July 5, 2017 08:11:52

Acushnet
Wednesday, July 5, 2017 06:23:59

Kensington
Wednesday, July 5, 2017 02:14:03 Wednesday, July 5, 2017 02:57:17 Wednesday, July 5, 2017 03:05:36

Angleton
Wednesday, July 5, 2017 09:42:36

Moriches
Wednesday, July 5, 2017 02:36:07 Wednesday, July 5, 2017 02:36:16 Wednesday, July 5, 2017 02:37:35 Wednesday, July 5, 2017 02:38:33 Wednesday, July 5, 2017 02:38:42 Wednesday, July 5, 2017 02:39:00 Wednesday, July 5, 2017 02:39:25 Wednesday, July 5, 2017 02:39:34 Wednesday, July 5, 2017 07:27:10

Sandy Hook
Wednesday, July 5, 2017 07:21:01

Annapolis
Wednesday, July 5, 2017 02:36:54 Wednesday, July 5, 2017 02:37:06 Wednesday, July 5, 2017 02:39:05 Wednesday, July 5, 2017 07:48:58 Wednesday, July 5, 2017 08:13:44

Wiarton
Wednesday, July 5, 2017 07:12:13 Wednesday, July 5, 2017 07:12:43 Wednesday, July 5, 2017 07:36:29

Count ID ref1 ref2 kHz Baud City Country Lat Lon km Deg 1 885 270 271 292.0 100 Cape Mendocino, CA United States 40.447 -124.405 2,563 270 4 886 272 273 287.0 100 Fort Stevens, OR United States 46.208 -123.96 2,363 284 77 907 304 305 320.0 200 Richmond, BC Canada 49.114 -123.183 2,283 292 1404 871 172 173 300.0 100 Appleton, WA United States 45.792 -121.332 2,168 282 24 827 244 245 312.0 200 Tampa, FL United States 27.85 -82.543 2,138 149 3 799 044 045 290.0 200 Penobscot, ME United States 44.453 -68.776 1,942 83 1 772 198 199 306.0 200 Acushnet, MA United States 41.749 -70.889 1,852 93 371 771 196 197 294.0 100 New Bern, NC United States 35.181 -77.059 1,765 123 3 778 192 193 292.0 100 Kensington, SC United States 33.491 -79.349 1,759 132 1 828 246 247 301.0 100 Angleton, TX United States 29.301 -95.484 1,756 187 9 803 006 007 293.0 100 Moriches, NY United States 40.794 -72.756 1,743 98 209 806 012 013 289.0 100 Driver, VA United States 36.963 -76.562 1,670 116 1 804 008 009 286.0 200 Sandy Hook, NJ United States 40.475 -74.02 1,659 101 200 844 094 095 324.0 200 Hudson Falls, NY United States 43.272 -73.542 1,595 90 5 847 058 059 301.0 200 Annapolis, MD United States 39.018 -76.61 1,538 110 1116 792 136 137 297.0 200 Bobo, MS United States 34.125 -90.696 1,233 168 133 839 118 119 322.0 100 Youngstown, NY United States 43.239 -78.972 1,170 95 3 918 310 311 286.0 200 Wiarton, ON Canada 44.75 -81.117 971 87 283 838 116 117 319.0 200 Detroit, MI United States 42.306 -83.103 883 106 109 836 112 113 292.0 200 Cheboygan, MI United States 45.656 -84.475 704 81 42117 777 218 219 304.0 200 Mequon, WI United States 43.202 -88.066 474 113 16492 831 102 103 298.0 100 Upper Keweenaw, MI United States 47.233 -88.628 446 55 32257 830 100 101 296.0 100 Wisconsin, Point WI United States 46.708 -92.025 219 30

(http://i.imgur.com/m8XUNL7.png)

CURRENT DGPS ADVISORIES FOR 05 Jul 2017 Site Name Site Id BNM # OUTAGE MESSAGE SCHEDULED / UNSCHEDULED OUTAGES Lincoln 764 0242-17 BROADCAST SITE IS UNUSABLE AS OF 06/22/2017 18:44 Z UNTIL FURTHER NOTICE. Lincoln 764 0234-17 BROADCAST SITE WILL BE UNUSABLE FROM 07/13/2017 16:00 Z TO 07/13/2017 18:00 Z. Upolu Point 879 0238-17 BROADCAST SITE WILL BE UNUSABLE FROM 07/05/2017 18:00 Z TO 07/06/2017 00:00 Z. Tampa (Macdill) 827 0227-17 BROADCAST SITE STATUS IS UNCONFIRMED DUE TO NETWORK OUTAGE AS OF 06/13/2017 08:20 Z UNTIL FURTHER NOTICE. Hudson Falls 844 0250-17 BROADCAST SITE STATUS IS UNCONFIRMED DUE TO NETWORK OUTAGE AS OF 07/03/2017 21:39 Z UNTIL FURTHER NOTICE. GENERAL INFORMATION Reedy Point 870 0204-17 DGPS BROADCAST SITE WILL PERMANENTLY CEASE BROADCASTING CORRECTIONS ON 31 JULY 2017 AT 1400Z Note: The Louisville, KY DGPS Beacon (290 KHZ, Site ID 869) was terminated as of 1200Z (0800 EDT) May 31, 2017. The Millers Ferry, AL (320 KHz, Site ID 865), Rock Island, IL (311 KHz, Site ID 863), and St. Paul, MN (317KHz, Site ID 864) DGPS beacon signals were terminated as of 1200Z (0800 EDT) June 30, 2017.

_{AFE822x v2.0 SDR with 43' Wellbrook ALA100LN loop oriented E-W}
Title: Re: DGPS Logs Jul 4, 2017 UTC 2334 - Jul 5, 2017 UTC 2340 (AFE822x)
Post by: ChrisSmolinski on July 06, 2017, 1409 UTC: Now I don't feel so bad. I need a relatively storm free night (yeah, in July, good luck with that) to see if the band pass filter improves decodes.

Actually I need to run two SDRs at the same time, one with the filtered output and one without.

Actually, I would need to first characterize the two SDRs to make sure they behave the same, with the same antenna input.

I may just assume the filter helps ;D
Title: Re: DGPS Logs Jul 4, 2017 UTC 2334 - Jul 5, 2017 UTC 2340 (AFE822x)
Post by: skeezix on July 06, 2017, 2251 UTC: This is science! Questions are meant to be answered.

Have you noticed if your 10 MHz reference hooked up to the SDR helps with decodes?
Title: Re: DGPS Logs Jul 4, 2017 UTC 2334 - Jul 5, 2017 UTC 2340 (AFE822x)
Post by: ChrisSmolinski on July 07, 2017, 1308 UTC: Quote from: skeezix on July 06, 2017, 2251 UTC

I don't record DGPS on the netSDR with the reference, although that would be an interesting experiment (with and without the reference). I am not sure what the actual frequency accuracy of a typical DGPS transmitter is, probably pretty good. I know the AFEDRI drifts a few Hz over time. Right now it reads 10 MHz WWV low by 8.6 Hz. But once you get down to the DGPS band that becomes negligible, 0.258 Hz at 300 kHz. That's the frequency error due to the sample rate error, you also have the data bits getting skewed over time, although that should be very negligible unless you have a horrific SDR, like an RTL dongle.