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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>If you have a system where you drive the modulator directly and use<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Courier New"'>txprelim=yes<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoListParagraph style='margin-left:20.25pt;text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>then you already have limiting<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>If not, and you are using “microphone audio” then you should un-comment<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Courier New"'>txlimonly=yes<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>it is quite possible to overdrive the URI and it sounds nasty when it happens.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>(You should check that the values for txtone and txvoice that you used in your audio calibration add up to a number less than 1000).<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>GL<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Ken<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><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-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] <b>On Behalf Of </b>Keith Goobie<br><b>Sent:</b> Sunday, March 03, 2013 12:19 PM<br><b>To:</b> REDBUTTON_CTRL<br><b>Cc:</b> APP RPT<br><b>Subject:</b> Re: [App_rpt-users] Audio Clipping with IAXRPT / Web Transceiver Client<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-family:"Arial","sans-serif"'>Hi Jon<br><br>Just checked the configs - <br><br>All three appearances (we control three URI fobs) of txlinonly are commented out, do you know what the default is.<br><br>Incoming audio from iaxrpt users seems OK, with no issues.<br><br>Keith<br><br>On 3/3/13 11:41 AM, "REDBUTTON_CTRL" <<a href="jrorke@cogeco.ca">jrorke@cogeco.ca</a>> wrote:</span><o:p></o:p></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif"'> Hi Kieth, In the usbradio.conf have you got the "txlinonly = yes'? <br> <br> This should limit TX audio coming from the URI.<br> <br> txlimonly=yes ; Audio limiting with no pre-emphasis on output channel: no,yes<br> ; no - Audio is not limited. <br> ; yes - Audio is limited.<br> ; Suitable for transmitters with no limiting but with pre-emphasis.<br> <br> You can also tell the IAX users to cut back their mic gains. I would start here first. Like a lot of people on Echolink they dont have the computer set up properly. I find that head sets sound the best rather than using the internal mics on lapatops.<br> <br> I would leave the codec as Ulaw. dont bother with GSM, has crappy watery audio.<br> <br> Jon VA3RQ<br> <br> On 3/3/2013 11:31 AM, Keith Goobie wrote: </span><o:p></o:p></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>Audio Clipping with IAXRPT / Web Transceiver Client Good day All.<br> <br> We have had our node up at VE3LSR / VE3UOR for a few months and we all have learned a lot about configuration and operation. It is ACID install and version id is 300.3.<br> <br> On our asterisk system, we support three nodes:<br> <br> 27211 – VE3UOR UHF repeater<br> 29133 – VE3LSR coupled through a RLC-DSP404 controller (often connected to VE3UPS and VE3UHN), and<br> 29154 – VA3LSR remote link for VE3LSR into VE3MUS – not too active – ad-hoc RF link.<br> <br> I have also been testing out iaxrpt and the WebTransceiver clients.<br> <br> I am on these systems and the results have been promising. I do notice some clipping on the audio on some stations. Initially I thought it was amplitude related – over-driving the URI-FOB, but I am now beginning to suspect that it may be network related and in my research I hear the term jitter being used – which if activated, adjust operation on the receiving end only.<br> <br> It may be that the system is not powered enough to drive the three uri-fobs. CPU show about 25% busy.<br> <span style='color:#0000FE'>[root@VE3LSR etc]# cat /proc/cpuinfo<br> processor : 0<br> vendor_id : GenuineIntel<br> cpu family : 15<br> model : 4<br> model name : Intel(R) Pentium(R) 4 CPU 3.00GHz<br> stepping : 3<br> cpu MHz : 2992.898<br> cache size : 2048 KB<br> physical id : 0<br> siblings : 2<br> core id : 0<br> cpu cores : 1<br> apicid : 0<br> fdiv_bug : no<br> hlt_bug : no<br> f00f_bug : no<br> coma_bug : no<br> fpu : yes<br> fpu_exception : yes<br> cpuid level : 5<br> wp : yes<br> flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm constant_tsc pni monitor ds_cpl est cid cx16 xtpr<br> bogomips : 5985.79<br> <br></span>We do think that the system is sufficiently powered.<br> <br> We are looking for comments & guidance. Are we expecting too much from the system having three fobs connected? We do have good bandwidth into and out of the site. <br> <br> I am listening to other systems – most not to busy, so I am not yet able to get a good reference point.<br> <br> I have not dabbled with the codecs much, but have been focused on using ulaw. I am also testing with GSM – lower bandwidth.<br> <br> So as I said before, thoughts or suggestions are welcome.<br> <br> Keith / VA3YC<br> -- <br> <a href="keith@goobie.org">keith@goobie.org</a><br> Keith Goobie<br> Richmond Hill, ON, CANADA<br> <br> <br> <br>_______________________________________________<br>App_rpt-users mailing list<br><a href="App_rpt-users@ohnosec.org">App_rpt-users@ohnosec.org</a><br><a href="http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users">http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users</a><br> </span><o:p></o:p></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><div class=MsoNormal align=center style='text-align:center'><span style='font-family:"Arial","sans-serif"'><hr size=3 width="95%" align=center></span></div><p class=MsoNormal><span style='font-size:10.0pt;font-family:Consolas'>_______________________________________________<br>App_rpt-users mailing list<br><a href="App_rpt-users@ohnosec.org">App_rpt-users@ohnosec.org</a><br><a href="http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users">http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users</a></span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:Consolas'><br></span><span style='font-family:"Arial","sans-serif"'>-- <br><a href="keith@goobie.org">keith@goobie.org</a><br>Keith Goobie<br>Richmond Hill, ON, CANADA</span><o:p></o:p></p></div></div></body></html>