[App_rpt-users] USB URIx overmodulation problem?

[Doug Crompton]

>From your chart it looks like it is saturating even at very low settings. 

What radio are you using? You must be injecting into a low level mic input. The iradio nput should be able to handle 100's of millivolts to a volt p-p. You need to look at where you are injecting the audio. Also for USB radio it is to a point that is not preemphasized  point and for simpleusb to a preemphasized point. 

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


Date: Wed, 5 Mar 2014 23:17:12 -0600
From: n9jpg.ham at gmail.com
To: app_rpt-users at ohnosec.org
Subject: [App_rpt-users] USB URIx overmodulation problem?

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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