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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Rob, <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Based on your comments about the telemetry "not sounding choppy when listening to it over the phone."<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>It could be that RF from your transmitter is getting into your sound fob. Do you have a transmitter hooked up to the USB sound fob? <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>As a test, disable your transmitter and use clip leads to connect a PC amplified computer speaker to your TX audio line and see if you still have choppy audio. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>If you do NOT have choppy audio with the amplified speaker, this surely points to some type of RF getting into your sound fob. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Hope this helps.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>73 <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Marshall - ke6pcv <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> App_rpt-users [mailto:app_rpt-users-bounces@lists.allstarlink.org] <b>On Behalf Of </b>Rob Noll<br><b>Sent:</b> Sunday, March 31, 2019 7:26 AM<br><b>To:</b> app_rpt-users@lists.allstarlink.org<br><b>Subject:</b> [App_rpt-users] USB fob choppy/stuttering audio<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Good morning all,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’m trying to set up an AllStar node using a USB fob based on the CM119 chip. I’m having issues with choppy/stuttering audio, particularly on telemetry. It’s bad enough that it renders the CW ID meaningless.<o:p></o:p></p><p class=MsoNormal>My original thought was lack of CPU power, but I have tried it on a Raspberry Pi 2, Pi 3, and several virtual machines on a quad-core PC with identical results. Also, the choppiness is NOT as bad when using the full USB driver instead of SimpleUSB, which I believe conclusively rules out CPU power.<o:p></o:p></p><p class=MsoNormal>I’ve also tried a powered USB hub, thinking that the USB device was not receiving enough power, with no improvement.<o:p></o:p></p><p class=MsoNormal>I’ve used the Android mobile app to connect to the node, and the telemetry does not seem to be choppy when listening to it over the app. While I need to do some more testing to say this conclusively, I do believe at this point that my issue is narrowed down to the USB fob itself and/or the specific audio stream being sent to the device.<o:p></o:p></p><p class=MsoNormal>I’m currently searching for a way to alter the sample rate that ASL is sending the audio to the device in.<o:p></o:p></p><p class=MsoNormal>Has anyone experienced this, and does anyone have any suggestions?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks and 73,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Rob, WX1N<o:p></o:p></p></div></body></html>