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<div dir="auto">Hi Marshall,</div><div dir="auto"><br></div><div dir="auto">Thanks for the thought, but it happens with both a transmitter and with a headset.</div><div dir="auto"><br></div><div dir="auto">Rob</div><div dir='auto'><br></div>
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<tbody><tr><td valign="top"><b>From: </b></td><td valign="top">Marshall Oldham ke6pcv@cal-net.org</td></tr>
<tr><td valign="top"><b>Sent: </b></td><td valign="top">April 1, 2019 16:10:38</td></tr>
<tr><td valign="top"><b>To: </b></td><td valign="top">'Users of Asterisk app_rpt' app_rpt-users@lists.allstarlink.org</td></tr>
<tr><td valign="top"><b>Subject: </b></td><td valign="top">Re: [App_rpt-users] USB fob choppy/stuttering audio</td></tr>
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<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>
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