Gqrx pre-bug report: Persistent ~2Mhz noise on center frequency with USRP B210 and gqrx v2.11.2-2-g7
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Ignatius Rivaldi
Apr 15, 2018, 3:00:30 AM4/15/18
to Gqrx SDR
OS: Arch Linux
Gqrx version v2.11.2-2-g7
Gqrx and Gnuradio installed through AUR
For some reason Gqrx have this big ~2MHz wide noise at center frequency and it is very insensitive to even FM signal, needing more than 40 dB PGA gain. It cannot even see wifi signals at 2.45 GHz. However, when I made my own spectrum analyzer through Gnuradio companion:
UHD: USRP source => Qt fosphor sink or UHD: USRP source => QT GUI Frequency sink
the 2MHz noise is gone, the B210 is much more sensitive, requiring only abou 20dB of PGA gain to see FM signal, and it can see wifi signals.
Gqrx photo attached, sorry for not screenshotting. I will make a proper bug report next week when I have access to USRP B210 again
Gqrx version v2.11.2-2-g7
Gqrx and Gnuradio installed through AUR
For some reason Gqrx have this big ~2MHz wide noise at center frequency and it is very insensitive to even FM signal, needing more than 40 dB PGA gain. It cannot even see wifi signals at 2.45 GHz. However, when I made my own spectrum analyzer through Gnuradio companion:
UHD: USRP source => Qt fosphor sink or UHD: USRP source => QT GUI Frequency sink
the 2MHz noise is gone, the B210 is much more sensitive, requiring only abou 20dB of PGA gain to see FM signal, and it can see wifi signals.
Gqrx photo attached, sorry for not screenshotting. I will make a proper bug report next week when I have access to USRP B210 again
Alexandru Csete
Apr 15, 2018, 5:55:57 AM4/15/18
to Gqrx
You have to try the gr-osmosdr source in gnuradio to compare, not the
UHD source.
I can't fix this in gqrx, so it will be waste of time opening a bug in
the gqrx bug tracker.
Alex
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UHD source.
I can't fix this in gqrx, so it will be waste of time opening a bug in
the gqrx bug tracker.
Alex
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