GQRX Tips

QT5
Prior to installation of gqrx make sure QT5 is available by installing the following:
qt5
qt5-devel


Pulse Audio
Prior to installation of gqrx make sure pulseaudio is available during build by installing the following:
pavucontrol
pavumeter
pulseaudio-libs-devel


Install gqrx
git clone https://github.com/csete/gqrx.git
cd gqrx
mkdir build
cd build
qmake-qt5 ..
make -j8
sudo make install


Typical device strings
For the b200:
uhd,type=b200,nchan=1

For the X310 with LFRX in slot 2:
uhd,addr=192.168.40.2,subdev=B:A,nchan=1

For the X310 with WBX in slot 1:
uhd,addr=192.168.40.2,nchan=1

For the N210 with LFRX:
uhd,addr=192.168.1.13,subdev=A:A,nchan=1

When switching between devices in gqrx the gain control changes will segfault the application.  Fix this by deleting the “gains” section in:
~/.config/gqrx/default.conf

Sending gqrx audio to fldigi
Install fldigi with yum

Configure fldigi sound card to use pulseaudio, leaving server string empty

Launch pulseaudio volume control, and under recording tab, fldigi capture from monitor of built-in audio analog stereo, and set level to 0 dB.

Adjust fldigi waterfall upper signal level and signal range.