Posted: . At: 8:55 AM. This was 10 months ago. Post ID: 18291
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I got my ASUS U3100MINI_PLUS_V2 dongle working in Alma Linux.


I was trying to get my ASUS U3100MINI_PLUS_V2 dongle to work as an SDR dongle on Alma Linux. But I tried editing the /etc/group file and added my user to the rtlsdr group and logged out and back in. Then the dongle was working fine when I ran gqrx as a normal user.

/etc/group
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root:x:0:
bin:x:1:
daemon:x:2:
sys:x:3:
adm:x:4:
tty:x:5:
disk:x:6:
lp:x:7:
mem:x:8:
kmem:x:9:
wheel:x:10:
cdrom:x:11:
mail:x:12:
man:x:15:
dialout:x:18:
floppy:x:19:
games:x:20:
tape:x:33:
video:x:39:
ftp:x:50:
lock:x:54:
audio:x:63:
users:x:100:
nobody:x:65534:
utmp:x:22:
utempter:x:35:
input:x:999:
kvm:x:36:qemu:jcartwright
render:x:998:
systemd-journal:x:190:
systemd-coredump:x:997:
dbus:x:81:
printadmin:x:996:
ssh_keys:x:995:
tss:x:59:clevis
sssd:x:994:
polkitd:x:993:
cockpit-ws:x:992:
cockpit-wsinstance:x:991:
chrony:x:990:
sshd:x:74:
slocate:x:21:
sgx:x:989:
systemd-oom:x:988:
jcartwright:x:1000:
avahi:x:70:
geoclue:x:987:
libstoragemgmt:x:986:
rtkit:x:172:
clevis:x:985:
pipewire:x:984:
brlapi:x:983:
colord:x:982:
flatpak:x:981:
gdm:x:42:
gnome-initial-setup:x:980:
tcpdump:x:72:
dnsmasq:x:979:
akmods:x:978:
nvidia-persistenced:x:977:
wireshark:x:976:jcartwright
usbmon:x:975:
user1:x:1001:
user2:x:1002:
user3:x:1003:
qemu:x:107:
saslauth:x:76:
rpc:x:32:
rpcuser:x:29:
unbound:x:974:
libvirt:x:973:jcartwright
rtlsdr:x:972:jcartwright

This is my ~/.config/gqrx/default.conf

/home/jcartwright/.config/gqrx/default.conf
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[General]
configversion=3
crashed=false
 
[audio]
gain=-60
udp_host=localhost
 
[dxcluster]
DXCAddress=localhost
DXCFilter=
DXCPort=7300
DXCSpotTimeout=10
DXCUsername=nocall
 
[gui]
geometry=@ByteArray(\x1\xd9\xd0\xcb\0\x2\0\0\0\0\x5-\0\0\x1/\0\0\vH\0\0\x4\xc9\0\0\x5-\0\0\x1X\0\0\vH\0\0\x4\xc9\0\0\0\0\0\0\0\0\rp)
state="@ByteArray(\0\0\0\xff\0\0\0\0\xfd\0\0\0\x2\0\0\0\x1\0\0\x1G\0\0\x3!\xfc\x2\0\0\0\x2\xfc\0\0\0;\0\0\x2\x5\0\0\x1\x65\0\b\0\x1a\xfa\0\0\0\x1\x2\0\0\0\x3\xfb\0\0\0\x18\0\x44\0o\0\x63\0k\0I\0n\0p\0u\0t\0\x43\0t\0l\x1\0\0\0\0\xff\xff\xff\xff\0\0\x1\f\0\xff\xff\xff\xfb\0\0\0\x12\0\x44\0o\0\x63\0k\0R\0x\0O\0p\0t\x1\0\0\0\0\xff\xff\xff\xff\0\0\x1J\0\a\xff\xff\xfb\0\0\0\xe\0\x44\0o\0\x63\0k\0\x46\0\x66\0t\x1\0\0\0\0\xff\xff\xff\xff\0\0\0\xc8\0\a\xff\xff\xfc\0\0\x2\x46\0\0\x1\x16\0\0\0\xde\x1\0\0\x1a\xfa\0\0\0\0\x2\0\0\0\x2\xfb\0\0\0\x12\0\x44\0o\0\x63\0k\0\x41\0u\0\x64\0i\0o\x1\0\0\0\0\xff\xff\xff\xff\0\0\0\xc3\0\xff\xff\xff\xfb\0\0\0\xe\0\x44\0o\0\x63\0k\0R\0\x44\0S\x1\0\0\0\0\xff\xff\xff\xff\0\0\0h\0\xff\xff\xff\0\0\0\x3\0\0\0\0\0\0\0\0\xfc\x1\0\0\0\x1\xfb\0\0\0\x1a\0\x44\0o\0\x63\0k\0\x42\0o\0o\0k\0m\0\x61\0r\0k\0s\0\0\0\0\0\xff\xff\xff\xff\0\0\x1\x42\0\xff\xff\xff\0\0\x4\xcf\0\0\x3!\0\0\0\x1\0\0\0\x2\0\0\0\b\0\0\0\x2\xfc\0\0\0\x1\0\0\0\x2\0\0\0\x1\0\0\0\x16\0m\0\x61\0i\0n\0T\0o\0o\0l\0\x42\0\x61\0r\x1\0\0\0\0\xff\xff\xff\xff\0\0\0\0\0\0\0\0)"
 
[input]
device="rtl=0"
frequency=463000000
gains=@Variant(\0\0\0\b\0\0\0\x1\0\0\0\x6\0L\0N\0\x41\0\0\0\x2\0\0\0\x30)
sample_rate=1800000
 
[receiver]
demod=Narrow FM
filter_high_cut=5000
filter_low_cut=-5000
offset=-429200
 
[remote_control]
allowed_hosts=127.0.0.1

This configuration really does work just fine now. It was just a permissions issue. I can use the rtl_test utility to test the functionality of your SDR dongle.

[jcartwright@localhost:0 gqrx]$ rtl_test
Found 1 device(s):
  0:  Realtek, Rtl2832UDVB, SN: 
 
Using device 0: ASUS U3100MINI_PLUS_V2
Found Fitipower FC0013 tuner
Supported gain values (23): -9.9 -7.3 -6.5 -6.3 -6.0 -5.8 -5.4 5.8 6.1 6.3 6.5 6.7 6.8 7.0 7.1 17.9 18.1 18.2 18.4 18.6 18.8 19.1 19.7 
Sampling at 2048000 S/s.
 
Info: This tool will continuously read from the device, and report if
samples get lost. If you observe no further output, everything is fine.
 
Reading samples in async mode...

This was an easy fix. Now I can use the SDR dongle. After installing the sox package, I was able to listen to FM radio using my SDR dongle.

[jcartwright@localhost:0 gqrx]$ rtl_fm -M wbfm -f 102.1M | play -r 32k -t raw -e s -b 16 -c 1 -V1 -
Found 1 device(s):
  0:  Realtek, Rtl2832UDVB, SN: 
 
Using device 0: ASUS U3100MINI_PLUS_V2
 
-: (raw)
 
 File Size: 0         
  Encoding: Signed PCM    
  Channels: 1 @ 16-bit   
Samplerate: 32000Hz      
Replaygain: off         
  Duration: unknown      
 
In:0.00% 00:00:00.00 [00:00:00.00] Out:0     [      |      ]        Clip:0    Found Fitipower FC0013 tuner
Tuner gain set to automatic.
Tuned to 102371000 Hz.
Oversampling input by: 6x.
Oversampling output by: 1x.
Buffer size: 8.03ms
Exact sample rate is: 1020000.026345 Hz
Sampling at 1020000 S/s.
Output at 170000 Hz.
In:0.00% 00:00:06.66 [00:00:00.00] Out:205k  [      |      ]        Clip:0    ^CSignal caught, exiting!
 
User cancel, exiting...
In:0.00% 00:00:06.66 [00:00:00.00] Out:213k  [ -====|====- ]        Clip:0    
Aborted.

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