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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">Thanks. Where do I find the source kit at you mentioned?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt;font-family:"Comic Sans MS";color:black">Bill Hurlock<o:p></o:p></span></b></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<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""> Jim Duuuude [mailto:telesistant@hotmail.com]
<br>
<b>Sent:</b> Tuesday, March 19, 2013 2:36 PM<br>
<b>To:</b> Bill Hurlock; app_rpt mailing list<br>
<b>Subject:</b> RE: [App_rpt-users] RTCM Parameter question<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-family:"Calibri","sans-serif"">Unless you have a particularly quirky receiver, leave it at 0.<br>
<br>
Quoting from the source kit (README-DSPBEW):<o:p></o:p></span></p>
<pre><i>Baseband Examination Window<o:p></o:p></i></pre>
<pre><i><o:p> </o:p></i></pre>
<pre><i>Typically, the discriminator of an FM communications receiver produces <o:p></o:p></i></pre>
<pre><i>results containing audio spectrum from the "sub-audible" range <o:p></o:p></i></pre>
<pre><i>(typically < 100 Hz) to well above frequencies able to be produced by <o:p></o:p></i></pre>
<pre><i>modulating audio. These higher frequencies can be utilized to determine <o:p></o:p></i></pre>
<pre><i>signal quality, since they can only contain noise (or no noise, if a <o:p></o:p></i></pre>
<pre><i>sufficiently strong signal is present).<o:p></o:p></i></pre>
<pre><i><o:p> </o:p></i></pre>
<pre><i>For receivers (such as the Motorola Quantar, etc) that do not provide <o:p></o:p></i></pre>
<pre><i>sufficient spectral content at these "noise" frequencies (for various <o:p></o:p></i></pre>
<pre><i>reasons), The "DSP/BEW (Digital Signal Processor / Baseband Examination <o:p></o:p></i></pre>
<pre><i>Window)" feature of the RTCM firmware may be utilized. <o:p></o:p></i></pre>
<pre><i><o:p> </o:p></i></pre>
<pre><i>These receivers are perfectly capable of providing valid "noise" signal <o:p></o:p></i></pre>
<pre><i>with no modulation on the input of the receiver, but with strong <o:p></o:p></i></pre>
<pre><i>modulation (high frequency audio and high deviation), it severely <o:p></o:p></i></pre>
<pre><i>interferes with proper analysis of signal strength.<o:p></o:p></i></pre>
<pre><i><o:p> </o:p></i></pre>
<pre><i>This feature provides a means by which a "Window" of baseband (normal <o:p></o:p></i></pre>
<pre><i>audio range) signal is examined by a DSP and a determination of whether <o:p></o:p></i></pre>
<pre><i>or not sufficient audio is present to cause interference of proper <o:p></o:p></i></pre>
<pre><i>signal strength is made. During the VERY brief periods of time when it <o:p></o:p></i></pre>
<pre><i>is determined that sufficient audio is present to cause interference, <o:p></o:p></i></pre>
<pre><i>the signal strength value is "held" (the last valid value previous to <o:p></o:p></i></pre>
<pre><i>the time of interference) until such time that the interfering audio is <o:p></o:p></i></pre>
<pre><i>no longer present. <o:p></o:p></i></pre>
<pre><i><o:p> </o:p></i></pre>
<pre><i>The DSP/BEW feature is selectable, and should not be used for a receiver <o:p></o:p></i></pre>
<pre><i>that does not need it.</i><o:p></o:p></pre>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">> From: <a href="mailto:bill.hurlock@cpcomms.com">
bill.hurlock@cpcomms.com</a><br>
> To: <a href="mailto:app_rpt-users@ohnosec.org">app_rpt-users@ohnosec.org</a><br>
> Date: Tue, 19 Mar 2013 18:21:50 +0000<br>
> Subject: [App_rpt-users] RTCM Parameter question<br>
> <br>
> I can't seem to find any reference to what item 17 does in the RTCM setup menu. It says DSP/BEW and appears to have 2 choices 0 or 1.<br>
> <br>
> Bill Hurlock<br>
> CPCommunications<br>
> 856-234-1661 Home Office<br>
> 856-264-1010 Cell<br>
> 914-345-9292 Ext.429<br>
> <a href="http://www.cpcomms.com">www.cpcomms.com</a><br>
> WA2TQI<br>
> <br>
> Providing Solutions for Audio and Video Communications<br>
> <br>
> <br>
> <br>
> _______________________________________________<br>
> App_rpt-users mailing list<br>
> <a href="mailto: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><o:p></o:p></span></p>
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