[App_rpt-users] USB URIx overmodulation problem?

[KJ6KO]

Think he was talking about audio OUT to the radio, not the two inputs.
  ----- Original Message ----- 
  From: Doug Crompton 
  To: app_rpt-users at ohnosec.org 
  Sent: Friday, March 07, 2014 11:42 PM
  Subject: Re: [App_rpt-users] USB URIx overmodulation problem?


  There is a better description of that at the DMK site.  

  http://dmkeng.com/images/URIx%20Data%20Sheet.pdf

  Pin 9 in labeled Mic_in_DC  which in essence means direct coupled. It is a low level input and if you were to use it you would definitely need to capacitively couple to avoid damage. If for some reason you are using pin 9 switch to 21 and that should solve your problem. See the schematic at the DMK site to understand the difference between pin 9 and 21. 

  73 Doug
  WA3DSP
  http://www.crompton.com/hamradio



  > Date: Fri, 7 Mar 2014 22:32:12 -0800
  > From: cypresstower at yahoo.com
  > To: n9jpg.ham at gmail.com; app_rpt-users at ohnosec.org
  > Subject: Re: [App_rpt-users] USB URIx overmodulation problem?
  > 
  > Assuming one knows about the rxboost=x setting in the usbradio.conf.  
  > 
  > The URI has 2 audio inputs, pin 21 and pin 9.  Pin 21 is padded, pin 9 is not.  
  > Motorola's work well on pin 21,  but occasionally it may be necessary to use
  > pin 9 along with some minor modifications to properly adjust rx audio.  
  > In this case, look at the RIM from repeater builder. It has only one audio input
  > and a selectable audio input attenuator. You don't need any extra parts or mods.  
  > Their input attenuator works well with a URI.
  > The RIM has some other unique advantages one might consider.
  > JK
  > --------------------------------------------
  > On Thu, 3/6/14, Kevin Oleniczak <n9jpg.ham at gmail.com> wrote:
  > 
  > Subject: [App_rpt-users] USB URIx overmodulation problem?
  > To: "app_rpt-users at ohnosec.org" <app_rpt-users at ohnosec.org>
  > Date: Thursday, March 6, 2014, 12:17 AM
  > 
  > I'm using a
  > URIx module with my radio and am in the process of adjusting
  > audio levels. I'm following the well documented
  > procedures to set rx and tx levels but noticed that that
  > choices in txvoice levels have little or no effect. I've
  > made some measurements with my service monitor.
  > 
  > 
  > radio tune txvoice 10  >> 0.35Khz deviation
  > radio tune txvoice 14  >> 4.8Khz deviation
  > radio tune txvoice 15  >> 4.8Khz deviation
  > radio tune txvoice 20  >> 5.2Khz deviation
  > radio tune txvoice 100  >> 5.2Khz deviation
  > 
  > radio tune txvoice 500  >> 5.2Khz deviation
  > radio tune txvoice 900  >> 5.2Khz deviation
  > 
  > With a goal of 3KHz deviation, its not possible
  > through settings alone. Any ideas why this is so touchy?
  > 
  > 
  > thanks
  > 
  > 
  > 
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