HFU HF Underground

Loggings => DGPS => Topic started by: ChrisSmolinski on January 20, 2017, 1549 UTC

Title: UNID DGPS 325 kHz 200 Baud 19-20 Jan 2017
Post by: ChrisSmolinski on January 20, 2017, 1549 UTC
When I looked at the SDR waterfall this morning, I noticed an apparent DGPS station on 325 kHz. Checking the UNID window, I could see it was sending ID 000. I assume this is the return of a test transmitter. Got quite a few decodes, several hundred over the span of just a few hours.

This brings up (again) the issue that the way Amalgamated DGPS works, there's no easy way to find new stations that aren't in the defined station list.
Title: Re: UNID DGPS 325 kHz 200 Baud 19-20 Jan 2017
Post by: skeezix on January 21, 2017, 0103 UTC
Cool!

What times was it on? Hopefully it came up here.
Title: Re: UNID DGPS 325 kHz 200 Baud 19-20 Jan 2017
Post by: ChrisSmolinski on January 21, 2017, 0141 UTC
I believe it was there most of the night. I think I see it now on the waterfall. Yes, it is showing up on the UNID window.
Title: Re: UNID DGPS 325 kHz 200 Baud 19-20 Jan 2017
Post by: skeezix on January 21, 2017, 0157 UTC
Its not making it up here now (21 Jan 2017 UTC 0155).

Tried on the AFE822x with Bonito Boni-Whip and 43' Wellbrook ALA100LN loop (E-W) with phasing, as well as took a close look at the Perseus with a Wellbrook ALA1530S+.

The Perseus definitely is not getting it.

The AFE822x has something on 325, but looks more like a carrier or QRM. Far too narrow for DGPS.
Title: Re: UNID DGPS 325 kHz 200 Baud 19-20 Jan 2017
Post by: ChrisSmolinski on January 21, 2017, 1659 UTC
I added it to my ADGPS database, and found these decodes last night:

Count    ID   ref1 ref2 kHz   Baud City                        
229      685  000  000  325.0 200  UNID000-200                  


The first was 2254z, the last was 1221z this morning.
Title: Re: UNID DGPS 325 kHz 200 Baud 19-20 Jan 2017
Post by: skeezix on January 21, 2017, 2329 UTC
Re-checked the frequency (21 Jan 2017 UTC 2326) and the only signal is a CW ID from an NDB on 326. Its LTU1 (Little Sioux) in Spencer, IA.



1 https://www.airnav.com/cgi-bin/navaid-info?type=NDB&id=LTU&name=LITTLE+SIOUX
NAVAID INFORMATION AS PUBLISHED ON 05 JANUARY 2017

LTU
LITTLE SIOUX NDB
SPENCER, IA

Location

   Lat/Long: 43-07-37.339N / 095-07-58.108W   (43.1270386/-95.1328078)
  Elevation: 1307.8 ft.
  Variation: 05E (1985)
Operational Characteristics

                          Type: NDB
                         Class: MHW
                      Z marker: no
                     Frequency: 326
                 TACAN channel:
            Hours of operation: 24
                      Voice ID: no
                      Morse ID: .-.. - ..-
                NOTAM facility: SPW
                           FSS:
        FSS hours of operation: 24
Technical Characteristics

                         Power: 25 watts
                      Accuracy: NOS
                    Monitoring: Internal monitoring only
                         Owner: FEDERAL AVIATION ADMIN
                      Operator: FEDERAL AVIATION ADMIN
           Common system usage: yes
                For public use: yes
Remarks

NDB UNMONITORED.