<div dir="ltr">I added a 10µF electrolytic capacitor in series with the Discriminator output of my hamtronics, but was still not able to get the squelch calibrated. Here was the diagnostic output: <div>
<p class=""><span class="">Testing level at 1000 Hz for De-Emphasized Audio </span></p>
<p class=""><span class="">Testing level at 2000 Hz for De-Emphasized Audio</span></p>
<p class=""><span class="">Error -- Measured 9581, should have been between 4380 and 6155</span></p>
<p class=""><span class="">Testing level at 3200 Hz for De-Emphasized Audio</span></p>
<p class=""><span class="">Error -- Measured 10030, should have been between 2271 and 3073</span></p>
<p class=""><span class="">Testing level at 3200 Hz for Squelch Noise Detector</span></p>
<p class=""><span class="">Error -- Measured 279, should have been between 0 and 50</span></p>
<p class=""><span class="">Testing level at 6000 Hz for Squelch Noise Detector</span></p>
<p class=""><span class="">Testing level at 7200 Hz for Squelch Noise Detector</span></p>
<p class=""><span class="">Error -- Measured 211, should have been between 500 and 1023</span></p></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Mar 27, 2016 at 10:53 PM, Eric Guth <span dir="ltr"><<a href="mailto:eric@efratnetworks.net" target="_blank">eric@efratnetworks.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">10 Uf , 35VDC will usually do the job.
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">73,
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Eric Guth<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">4Z1UG<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Allstar: 28422<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><a href="http://www.qsotoday.com/" target="_blank"><span style="color:blue">QSO Today</span></a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<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""> <a href="mailto:app_rpt-users-bounces@ohnosec.org" target="_blank">app_rpt-users-bounces@ohnosec.org</a> [mailto:<a href="mailto:app_rpt-users-bounces@ohnosec.org" target="_blank">app_rpt-users-bounces@ohnosec.org</a>]
<b>On Behalf Of </b>Skyler F<br>
<b>Sent:</b> Monday, March 28, 2016 7:35 AM<br>
<b>To:</b> Bryan Fields<br>
<b>Cc:</b> <a href="mailto:app_rpt-users@ohnosec.org" target="_blank">app_rpt-users@ohnosec.org</a><br>
<b>Subject:</b> Re: [App_rpt-users] Hamtronics receiver issue with AllStar RTCM<u></u><u></u></span></p><div><div class="h5">
<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Hi Bryan, can you send me the exact wiring between your hamtronics and your RTCM? What value DC blocking capacitor, any jumpers in the RTCM selected etc...?<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">73,<u></u><u></u></p>
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<p class="MsoNormal">Skyler<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">On Sun, Mar 27, 2016 at 5:08 PM, Bryan Fields <<a href="mailto:Bryan@bryanfields.net" target="_blank">Bryan@bryanfields.net</a>> wrote:<u></u><u></u></p>
<p class="MsoNormal">On 3/27/16 5:12 PM, Skyler F wrote:<br>
> For a voter project, we got the hamtronics VHF receiver pretuned to the<br>
> repeaters input frequency. The idea is to use hamtronics receivers for<br>
> every voted receive site for equivalent audio characteristics.<br>
<br>
> So... I hooked a cheap sound card up to audacity, and took a look at the<br>
> spectrum of each receiver. The hamtronics obviously looks like it lacks<br>
> high frequency noise on the discriminator output.<br>
<br>
> Does anybody else have experience with hamtronics receivers?<br>
<br>
Yes, I have a number of them in place and find they work perfectly with the<br>
RTCM. It can give about 2v P-P on the discriminator pin, and has the high<br>
frequency compute the RTCM squelch needs.<br>
<br>
My prime setup is here:<br>
<a href="http://gallery.keekles.org/d/28384-2/0330141929a.jpg" target="_blank">http://gallery.keekles.org/d/28384-2/0330141929a.jpg</a><br>
<br>
Note you'll want to put a cap in line, as the discriminator is DC coupled in<br>
the hamtronics. Can you put a scope on the discriminator line and measure the<br>
voltage? You might have a problem with the receiver.<br>
<br>
73's<br>
<span><span style="color:#888888">--</span></span><span style="color:#888888"><br>
<span>Bryan Fields</span><br>
<br>
<span><a href="tel:727-409-1194" target="_blank">727-409-1194</a> - Voice</span><br>
<span><a href="tel:727-214-2508" target="_blank">727-214-2508</a> - Fax</span><br>
<span><a href="http://bryanfields.net" target="_blank">http://bryanfields.net</a></span></span><u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">-- <u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Arial Narrow","sans-serif";color:#38761d">Skyler Fennell</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Arial Narrow","sans-serif";color:#38761d"><a href="http://amsatnet.info" target="_blank">amsatnet.info</a></span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Arial Narrow","sans-serif";color:#38761d">KDØWHB</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Arial Narrow","sans-serif";color:#38761d"><a href="mailto:electricity440@gmail.com" target="_blank">electricity440@gmail.com</a></span><u></u><u></u></p>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><font face="arial narrow, sans-serif" color="#38761d">Skyler Fennell</font><div><font face="arial narrow, sans-serif" color="#38761d"><a href="http://amsatnet.info" target="_blank">amsatnet.info</a></font></div><div><font face="arial narrow, sans-serif" color="#38761d">KDØWHB</font></div><div><font face="arial narrow, sans-serif" color="#38761d"><a href="mailto:electricity440@gmail.com" target="_blank">electricity440@gmail.com</a></font></div></div></div>
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