gr-hnch Pulse Sink / GNU Radio Audio ~ (was: Re: Audio sink to "wire")

Hey Henning,

huh! Doesn't putting the same sink name into the upstream GNU Radio audio source do the same? Asking for a friend who's collecting bugs on the gr-audio blocks [1]…

Best regards,
Marcus

[1] https://github.com/gnuradio/gnuradio/issues/2539#issuecomment-2078130433

On 06.06.24 22:08, Henning Paul wrote:

Hi,

Am 06.06.24 um 14:38 schrieb Marcus Müller:

Indeed, and that's why Henning Paul has his own CAT/hamlib proxy for interfacing with WSJT-X to emulate his own hardware frontend, see [1] slide 22. Luckily, I don't think you'll have to go that far, usually. Depends, really, on what you want to control from WSJT-X; you'd choose CAT as transceiver/rig type, probably.

James Ahlstrom has a skeleton for a script on his page that I used: http://james.ahlstrom.name/hamlib.html

As a side note, I decided to write native PulseAudio source and sink blocks for GNU Radio in order to be able to directly select virtual sources or sinks without having to redirect audio streams with pavucontrol: https://github.com/hennichodernich/gr-hnch

regards,
Henning

However, I'm not deeply into these ham radio applications. If there's demand to talk about ham affairs like plugging WSJT-X to GNU Radio (and maybe ask whether someone can talk about their experiences doing something specific), I do recommend heading over to our Matrix chat room for GNU Radio in amateur radio,

#HamRadio:gnuradio.org

you can easily access that, if you've never used Matrix before, using, for example, [2]. Note that there's a lot of knowledge out there – and a lot of implementations that not everyone knows about. For example, I think someone has implemented FT-8 in GNU Radio (can't find the link right now). And: there's a series of talk recordings, organized by Barry Duggan himself, which I find worth watching [3].

Best,
Marcus

[1] https://github.com/hennichodernich/talks/blob/main/SDR_Selbstbau.pdf
[2] https://app.element.io/#/room/#HamRadio:gnuradio.org (account necessary for writing messages, you can sign up for free there, or anywhere else on the matrix network; do join [2a] while you're there)
[2a] https://app.element.io/#/room/#gnuradio-space:gnuradio.org
[3] https://wiki.gnuradio.org/index.php/Talk:HamRadio

On 05.06.24 23:21, Kevin McQuiggin wrote:

Hi Jakub and Marcus:

On the Mac, use the BlackHole virtual audio driver.  It's at https://github.com/ExistentialAudio/BlackHole.  You can create a virtual audio device and point WSJT-X at it for input, output, or both.  It works well and the developer is responsive to questions and suggestions.

Kevin

On Jun 5, 2024, at 1:12 PM, Marcus Müller <marcus.mueller@ettus.com> wrote:

Uff, please don't recommend such stunts :) This can be solved easily in software at zero cost.

If you're on a modern Linux, you use the pipewire audio system. Install `qpwgraph`, start WSJT-X and just use qwpgraph to connect the output of your GNU Radio flow graph to the input of your WSJT-X. (or vice versa, really!)

If you're using an older Linux distribution, you might still be using pulseaudio. No problem, you just 1. create a "black hole" audio sink, then 2. form a virtual microphone input from that:

1. pactl load-module module-null-sink sink_name=cable_out sink_properties=device.description=cable_out

2. pactl load-module module-remap-source master=cable_out.monitor source_name=cable_in source_properties=device.description=cable_in

You'd then use `cable_out` as device name in your GNU Radio Audio sink. That's it.

On Windows, I'm no expert, but there's many loopback ways. there's VB-Cable, which used to be a thing when I used WIndows the last time.

No expertise on Mac OS, but if something is Mac OS's thing, it's multimedia routing, so that should work. In no case should you spend money on an external sound card, and live with the quality loss of that!

Best regards,
Marcus

On 05.06.24 14:27, vittben@pm.me wrote:

Hi Jakub and group!  IMO the simplest way to "redirect" audio sink, and that's the solution I usually use, use another USB sound card for WSJT-X with an "audio splitter" and "physical crossed cable".  The audio splitter is only necessary if you want to monitor the audio.  No need for complicated settings, virtual audio cable, etc. etc...... fast and dirty!!!    Enjoy    Vittorio, I3VFJ        

Message: 5  Date: Tue, 28 May 2024 06:58:18 +0000  From: Šerých Jakub Serych@panska.cz    To: "discuss-gnuradio@gnu.org" discuss-gnuradio@gnu.org    Subject: Audio sink to "wire"  Message-ID:  PAXP189MB167934066ABE5023CEF7E155DDF12@PAXP189MB1679.EURP189.PROD.OUTLOOK.COM      Content-Type: text/plain; charset="iso-8859-2"    Hi,  is there any simple way to redirect GNU radio Audio sink output to "wire" so that it can be processed by some other software (e.g. WSJT-X)?    Thanks for any info    Jakub