Technical Topics > Software
Amalgamated DGPS Software
ChrisSmolinski:
Wake the kids and phone the neighbors, Amalgamated DGPS is now out for Windows!
It seems to work OK, I've done all my testing on Windows 10. It should probably work on 7 and 8, maybe Vista and XP? Try it and let me know. This is the first release of a Windows version, so there are likely still some rough edges.
It decodes from both WAVE files and I/Q recording files from several popular SDR programs. I also decodes from live audio. It will decode as many DGPS channels as can fit in your audio passband (assuming your computer can keep up), I've been able to go up to 19 kHz wide.
Details and downloads here: http://www.blackcatsystems.com/software/dgps_decoding_software_sdr.html
KPC6NDB:
Hi Chris,
Kool program! This is really nice to be able to monitor the full DGPS band......
I've found a typo a few days ago: #667 Ulling Do, South Korea, 319 kHz is showing station #001 Ull every time it is logged. The RFId is correct/the one assigned.
Also #821 Portsmouth C2CEN, VA, 313 kHz has been off air for over two years. #821 shows up occasionally and is a false decode. It is/was a testing facility for the USCG.
Next, we know there is a problem with the ADGPS RFId display. Is it your intent to show the assigned RFId's or only the received RFId? I would prefer to see what ADGPS received to further verify the log and for submission of logs to Rxx.
Interestingly, I have been seeing a lot of logs from South African stations primarily #203. Building up over a week or so from one log at a time to 4, 5, 6 daily logs. Accompanied by usually another AFS station but they only log one hit. The interesting part is that the logs are happening during AFS local daylight morning/early afternoon time (+9 hours from here - nighttime here on the left coast)! A few days none are logged but seem to follow the daily ebb and flow of what I log on HF DSC from Cape Town 8 & 12 mHz.
I listened to the Perseus SDR audio I/Q stream of several of these AFS #203 logs and it sounds like the USA station on this channel, #828 Angleton, TX fades/flutters. I ran DSCDecoder at the same time (I knew it would not log #203 as it takes DSCDecoder about 12 seconds to sync) but it skips a few seconds of solid decodes of #828 and then ADGPS logs #203 during these "skips". I checked down to the exact seconds.
Interestingly some of the ADGPS daily logs seem to show a pattern of LF propagation to some regions.
Finally, I read somewhere in the description of ADGPS that the user would have access to the station list. I did not find that function in the windoz distribution of ADGPS. Would like to see that to eliminate the "clutter" of truly impossible logs like India, Egypt and so on.
The Graphing function is also kool Chris. Once in a while it shows a gradual slope of decline in logs but mostly peaks and valleys then a decline near local daylight.
Don
ChrisSmolinski:
Hi Don,
Thanks for the info about #667 and #821, I've corrected them in the station listing. I have noticed #821 popping up every now and then, with very few decodes, considering how close I am to Portsmouth, I assumed I would be getting more decodes if it was actually on the air, but did not know what the actual status was.
I'll have to look and see how difficult it would be to report the actual received RFid, right now the software does display both of the assigned values. It might be possible to display the received RFid in bold?
The app will look for your own copy of the station list, named dgps_station_list.txt and if it finds it, will use it in place of the built in list.
I do find pattern(s) of stations fading in and out, and propagation in general, very interesting. Sometimes you can see correlations between stations in the same general geographic area, and other times you can't probably because what you receive/decode is a function of not only whether that station's signal is making it to your QTH, but also whether there is another, interfering, station being received on the same frequency. It seems the more I learn about propagation, the less I know. ;D
Terry:
Impressive software and some good DX. For those that may be interested, Card Sound Fl is at the SE tip of Florida.
What antenna were you using?
ChrisSmolinski:
I've been using a 500 ft beverage (which really isn't a beverage down here). I have more recent logs in the Longwave forum, including some more distant catches, such as Portugal: https://www.hfunderground.com/board/index.php/board,16.0.html
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