Is it a Realtek chipset?
I've had problems with it on CentOS as the system will load up the DVB drivers 
(for TV tuner) thus interfering with the SDR.
What worked for me is blacklisting them & reboot. Give it a try.

cat /etc/modprobe.d/blacklist_rtl.conf 
blacklist dvb_usb_rtl28xxu 
blacklist rtl2832 
blacklist rtl2830

BTW there's a new package at if you 
care to test and confirm success so I can move it to the main repo.

Sent from the Delta quadrant using Borg technology!


----- Original Message -----
> From: "Fred Smith" <>
> To: "CentOS mailing list" <>
> Sent: Thursday, 1 February, 2018 22:38:09
> Subject: [CentOS] Anyone using GQRX in Centos-7, for SDR ?

> I gave myself a toy, one of those cheap USB Software Define Radios, and
> would like to use it on my C7 box. Having wasted some time on it, I gave
> up and installed Ubuntu on a USB HD so I can boot that to play with SDR.
> The Ubuntu GQRX installation is well documented and went off without a hitch.
> but I just hate having to boot something else on my main box (partly because
> it also runs a mailserver for my personal domain, partly because, well,
> I just want my box running CentOS, not Ubuntu.)
> Searching through SDR info on line I see someone has documented installing
> all the bits for C6, but I suspect the process is different for C7.
> BTW, I installed the various bits I could find from, er, I think some
> came from, some perhaps from epel, on C7, but couldn't get
> them to properly function.
> Worse, when the USB radio is unplugged from the system, it locks up hard.
> then a few days ago, I  had been playing with it using the UBUNTU install,
> did a reboot and for kicks fired up the GQRX on Centos, and lo and behold
> it worked! I tried running it on Centos yesterday and it reverted to type,
> i.e., lock up hard. I suspect that Ubuntu is leaving some hardware in a
> state that allows it to work on a subsequent Centos boot (without poweroff),
> but no clue what.
> So, if anyone can point me to how  to use it on C7, I'd greatly appreciate it.
> thanks in advance!
> Fred
> --
> ---- Fred Smith -- -----------------------------
>               Show me your ways, O LORD, teach me your paths;
>                     Guide me in your truth and teach me,
>                         for you are God my Savior,
>                    And my hope is in you all day long.
> -------------------------- Psalm 25:4-5 (NIV) --------------------------------
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