Recent content by usa-satcom

Here are couple of images from GOES 15 via LRIT. Was doing some testing today with 1.2m dish. One is from Himawari-8 but is available via GOES-15 as additional product. https://www.dropbox.com/s/pvrkef4mbm44zv1/hDK01_VIS_160405_0150c.jpg?dl=0...

Sounds good. I guess that sdr-console doesn't run on XP to well?

Which SDR do you have ? Joe

Made a couple of changes to EMWIN decoder to enhance DSP and also faster lock. Here is short video of operation using 1.2m dish and non-optimal circular feed (should be linear for best SNR). https://www.dropbox.com/s/zj36nppqlv4vpz5/enwim_airspy_sample.avi?dl=1 Joe

Also, i have off-pointed my 1.2m dish to see how things work with less signal. Viterbi corrections > 200 will result in loss of lock at a rate that is not very workable. < 200 seems to give pretty good results. Due to the nature of the FEC/differential coding when lock is lost, re-lock is not...

Have you played this file back and it works for you? I tried it and although the signal level is good, SR seems OK, i can't lock to it. Let me know if you can play it back in SDR-Console and feed decoder via UDP successfully and I will look at it again.

What is the normal sample rate for that dongle? Just curious as i can add in support for different sample rates, depending on how far off of 500K they are.... Joe

For those that want a test signal, i am making this recording available: https://www.dropbox.com/s/an5d3uwbaggqbfk/20160331_034952_500000.zip?dl=0 From 1.2m dish. This decodes from start to finish without a single error and should results in viterbi corrections of < 35 with RS always equal to...

AirStreamer outputs 10e6 or 2.5e6 or better said, whatever AirSpy supports. The EMWIN decoder needs 500K so, I either need to give you an older version of airstreamer (command line version) that supports decimation or i need to modify emdwin decoder to also support 2.5e6. That's why I can just...

Sure, let me get this first one done and then I can get you something. You have AirSpy, correct? Joe

Yep, you got it. Joe

OK, so i made some changes - when you are not experiencing some form of interference the viterbi corrections are < 375. This is about as good as it will get with your setup. Here is a screen capture of decoder on your file: this is what it should look like when things are working...

The HDSDR file is about the same quality wise. Has periodic disruption due to noise. There were only 3 files successfully received in that file. The reason is that a graphic was also being transferred and that occupied most of the virtual channel - unfortunately the entire file was not contained...

Which USRP do you have ? Joe

I had time to check the first file. Pretty good. Decoder likes it. It's not error free but again, pretty good. Here are the files that were in that recorded signal: https://www.dropbox.com/s/qcnoqo5b0t0wbrg/weather.7z?dl=0 There was one radar GIF but the recording was not long enough to get it...