Hi Kieth, In the usbradio.conf  have you got the "txlinonly = yes'?
 
 This should limit TX audio coming from the URI.
 
 txlimonly=yes        ; Audio limiting with no pre-emphasis on output channel: no,yes
             ; no - Audio is not limited.
             ; yes - Audio is  limited.
             ; Suitable for transmitters with no limiting but with pre-emphasis.
 
 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.
 
 I would leave the codec as Ulaw. dont bother with GSM, has crappy watery audio.
 
 Jon VA3RQ
 
 On 3/3/2013 11:31 AM, Keith Goobie wrote:

Audio Clipping with IAXRPT / Web Transceiver Client Good day All.
 
 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.
 
 On our asterisk system, we support three nodes:
 
 27211 – VE3UOR UHF repeater
 29133 – VE3LSR coupled through a RLC-DSP404 controller (often connected to VE3UPS and VE3UHN), and
 29154 – VA3LSR remote link for VE3LSR into VE3MUS – not too active – ad-hoc RF link.
 
 I have also been testing out iaxrpt and the WebTransceiver clients.
 
 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.
 
 It may be that the system is not powered enough to drive the three uri-fobs.   CPU show about 25% busy.
 [root@VE3LSR etc]# cat /proc/cpuinfo
 processor    : 0
 vendor_id    : GenuineIntel
 cpu family    : 15
 model        : 4
 model name    : Intel(R) Pentium(R) 4 CPU 3.00GHz
 stepping    : 3
 cpu MHz        : 2992.898
 cache size    : 2048 KB
 physical id    : 0
 siblings    : 2
 core id        : 0
 cpu cores    : 1
 apicid        : 0
 fdiv_bug    : no
 hlt_bug        : no
 f00f_bug    : no
 coma_bug    : no
 fpu        : yes
 fpu_exception    : yes
 cpuid level    : 5
 wp        : yes
 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
 bogomips    : 5985.79
 
We do think that the system is sufficiently powered.
 
 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.  
 
 I am listening to other systems – most not to busy, so I am not yet able to get a good reference point.
 
 I have not dabbled with the codecs much, but have been focused on using ulaw.  I am also testing with GSM – lower bandwidth.
 
 So as I said before, thoughts or suggestions are welcome.
 
 Keith / VA3YC
 --
 keith@goobie.org
 Keith Goobie
 Richmond Hill, ON, CANADA
  
  
 
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