Comments (8)
Here are the settings from gqrx. You can clearly see that 433.863420 is not in line with those small dots in the waterfall diagram.
When I record this and open it in URH I only get
Cropped to the peak:
When I manually set the frequency to 433.941.120 which perfectly matches the line of dots and record I get something like this which also doesn't look right?
Playing with AGC and other settings yields no improvement either. What am I doing wrong?
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The .wav format is not suitable for saving I/Q data from a SDR, please use a raw I/Q data format like used by GnuRadio or URH.
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Oh, but I didn't want to import I/Q, I deliberately wanted to choose WAV. Doesn't URH support WAV according to this? https://github.com/jopohl/urh/wiki/Supported-signal-file-formats
from urh.
URH does support WAV files, but note that the WAV file format does not (!) save clean I/Q data. So if something does not work as expected in URH, do not blame URH but WAV.
from urh.
I might have a wrong expectation, but I assumed that a signal like shown in the 4th picture from above would actually be what the contents of the WAV file would look like? The thing is: As far as I understood getting information from signals in CTFs or similar tasks is by analyzing the provided WAV files (because they are much smaller than I/Q files), so I wanted to exercise a bit how to properly generate those files so that URH can understand them. As I said initially, I don't intend to blame URH for anything not working, I was just looking for hints, that I might be using gqrx in a wrong way? I tried to set the same params like URH seems to use according to the 1st/2nd screenshot.
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When using WAV files the signals are saved in demodulated form in there. URH demodulates signals itself to allow for playing around with all demodulation settings, so there is a mismatch (Interpretation does not work then).
According to the images the sample rate of your signals might be wrong or mono/stereo does not fit. Maybe there are also some other Wave File format options?
from urh.
OK, understood, makes perfectly sense. I'll try to read up a little bit about this and learn some more.
from urh.
I'll close here for now. You can also contact us in Slack for further discussions!
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