I could use some help to connect the dots here.

I was trying to use a rtl-sdr to pipe a receive signal into the input or receive audio for asterisk instead of using the mic in on the usb audio fob.

Heres what I got so far. I can get a rtl-sdr installed in the Arch Linux by using pacman -s rtl-sdr.

Install reboot and plug in rtl-sdr.  You can run lsusb to see if the computer sees it or run rtl_test.

Now to get the audio piped to audio device in the computer we have to create a loopback right?

So

modprobe snd-aloop

to get the loopbacks setup but its not the usb audio but on the card1??

Then if you run this command, it will pipe a FM 12Khz bandwidth centered on 446.160 mhz and pipe it to the loopback device which is the device name of the loopback.

rtl_fm  -M USB -f 446.160M -A fast -s 12K -p -0 -g 0.0 | aplay -r 12k -t raw -D default:CARD=Loopback -c 1 -f S16_LEaplay -r 12k -t raw -c 1 -f S16_LE

I added these two items in rc.local so rtl-sdr input and loopbacks are setup before asterisk starts.

After doing some reading. https://github.com/sm0svx/svxlink/issues/250 <----took some notes from here.

I added the input and output device name in the alsa.conf

In asterisk/alsa.conf define the audio ports pointing to alsa loopback devices:

input_device= default:CARD=Loopback

output_device=default:CARD=Device

in modules.conf I enabled chan_alsa.so and after reboot with chan_alsa.so loaded I get no audio at all. My radio keys up at bootup but I get no initial greeting, no audio is coming through. Now I wasn’t expecting this to work of the top, I still need to figure out how the node is going to get cos from the rtl-sdr, I could try to use ctcss but can anyone help me connect the dots on this with what I have so far.

Thanks,

Joe

Kd2nfc