[App_rpt-users] USB URIx overmodulation problem?

[Doug Crompton]

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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