Getting stereo/IQ samples from soapyaudio

[Ryan Suchocki]

I'm trying to use GQRX to view baseband IQ via a soundcard using soapyaudio.

Using the device string:

device_id=0,driver=audio,soapy=0

results in a waterfall mirrored over 0Hz, as if it's only getting real samples.

The following output from SoapySDRUtil makes me think that I need to somehow pass the "stream args" "chan=stereo_iq" into soapyaudio.

Is there any way of doing that via GQRX?

SoapySDRUtil --probe
######################################################
##     Soapy SDR -- the SDR abstraction library     ##
######################################################

Probe device

----------------------------------------------------
-- Device identification
----------------------------------------------------
  driver=Audio
  hardware=Audio
  device_id=0
  origin=https://github.com/pothosware/SoapyAudio

----------------------------------------------------
-- Peripheral summary
----------------------------------------------------
  Channels: 1 Rx, 0 Tx
  Timestamps: NO
  Other Settings:
     * Stereo Sample Offset - Offset stereo samples for off-by-one audio inputs.
       [key=sample_offset, default=0, type=string, options=(-2, -1, 0, 1, 2)]

----------------------------------------------------
-- RX Channel 0
----------------------------------------------------
  Full-duplex: NO
  Supports AGC: YES
  Stream formats: CS8, CS16, CF32
  Native format: CS16 [full-scale=65536]
  Stream args:
     * Channel Setup - Input channel configuration.
       [key=chan, default=mono_l, type=string, options=(mono_l, mono_r, stereo_iq, stereo_qi)]
  Antennas: RX
  Full gain range: [0, 0] dB
  Full freq range: [0, 6000] MHz
    RF freq range: [0, 6000] MHz
  Sample rates: 0.008, 0.016, 0.02205, 0.032, 0.0441, 0.048, 0.096 MSps

[Roger David Powers]

You should be able to just put it right after 'soapy=0' in your gqrx device string, with commas to separate and without extra quotes.

For instance, from some of my notes, I was able to get the audio driver to use the rigctrl library with the following stuff in the device string.

default_input=True,default_output=False,device_id=0,driver=audio,soapy=0,rig=2509,rig_rate=0,rig_port=/dev/rig

So you should try something like:

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[Roger David Powers]

[ Sorry, hit 'send' too soon ]

You should be able to just put it right after 'soapy=0' in your gqrx device string, with commas to separate and without extra quotes.

For instance, from some of my notes, I was able to get the soapy audio driver to use the rigctrl library with the following stuff in the device string.

default_input=True,default_output=False,device_id=0,driver=audio,soapy=0,rig=2509,rig_rate=0,rig_port=/dev/rig

So you should try something like:

device_id=0,driver=audio,soapy=0,chan=stereo_iq

in the device string in the I/O Devices menu.

Regards,

RDP

On Thursday, September 30, 2021, 04:53:02 PM EDT, Ryan Suchocki <ryan.s...@gmail.com> wrote: