HL2 and WSJT-X via ALSA loopback

[Moriyama todora]

Hi All,

I am trying to connect SparkSDR 2.0.17 with WSJT-X 2.5.4 via ALSA loopback on Ubuntu studio 20.04LTS.
Setting for sound loopback is follows:

SparkSDR :
 output : loopback:PCM(hw:10,0)
 input :    loopback:PCM(hw:11,1)
WSJT-X

 input :    hw:CARD=loopback,DEV=1
 output : hw:CARD=loopback_,DEV=0

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Generic [HD-Audio Generic], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Generic [HD-Audio Generic], device 7: HDMI 1 [HDMI 1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: Generic_1 [HD-Audio Generic], device 0: ALC1220 Analog [ALC1220 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 10: Loopback [Loopback], device 0: Loopback PCM [Loopback PCM]
  Subdevices: 6/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 10: Loopback [Loopback], device 1: Loopback PCM [Loopback PCM]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 11: Loopback_1 [Loopback], device 0: Loopback PCM [Loopback PCM]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 11: Loopback_1 [Loopback], device 1: Loopback PCM [Loopback PCM]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
$

But no signal to WSJT-X. RX level is not up...
I checked with alsamixer and volumes are up.
And HL2-Quisk-WSJTX with QuiskDigitalInput,QuiskDigitalOutput.monitor is working on this Ubuntu.

Thanks,
Tosy,
Toshiyuki MORIYAMA

JA6VZB also AH0T

[ahop...@googlemail.com]

Hi,

I should be back near a radio tomorrow and will try to recreate this, I've managed to remain fairly ignorant of linux audio so if anyone else has an idea please shout.

73 Alan M0NNB