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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>I could use some help to connect the dots here. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Heres what I got so far. I can get a rtl-sdr installed in the Arch Linux by using pacman -s rtl-sdr. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Install reboot and plug in rtl-sdr. You can run lsusb to see if the computer sees it or run rtl_test. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Now to get the audio piped to audio device in the computer we have to create a loopback right? <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>So <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='text-autospace:none'><span style='font-family:Consolas'>modprobe snd-aloop<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>to get the loopbacks setup but its not the usb audio but on the card1??<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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.<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><span style='font-family:Consolas'>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<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-family:Consolas'>I added these two items in rc.local so rtl-sdr input and loopbacks are setup before asterisk starts. <o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>After doing some reading. <a href="https://github.com/sm0svx/svxlink/issues/250">https://github.com/sm0svx/svxlink/issues/250</a> <----took some notes from here. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I added the input and output device name in the alsa.conf<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#24292E;background:white'>In asterisk/alsa.conf define the audio ports pointing to alsa loopback devices: <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#24292E;background:white'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#24292E;background:white'>input_device=</span><span style='font-family:Consolas'> default:CARD=Loopback</span><span style='font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#24292E;background:white'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:Consolas'>output_device=default:CARD=Device<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='text-autospace:none'>in modules.conf I enabled <span style='font-family:Consolas'>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. <o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-family:Consolas'> <o:p></o:p></span></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal>Joe<o:p></o:p></p><p class=MsoNormal>Kd2nfc<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>