<div dir="ltr">My scope does not really work very well anymore but I'll see if I can get a P-P reading. What value cap should I put on the discriminator line?<div><br></div><div>73<br><div><br></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Mar 27, 2016 at 5:08 PM, Bryan Fields <span dir="ltr"><<a href="mailto:Bryan@bryanfields.net" target="_blank">Bryan@bryanfields.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">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>
</span><span class="">> 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>
</span><span class="">> Does anybody else have experience with hamtronics receivers?<br>
<br>
</span>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" rel="noreferrer" 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 class="HOEnZb"><font color="#888888">--<br>
Bryan Fields<br>
<br>
<a href="tel:727-409-1194" value="+17274091194">727-409-1194</a> - Voice<br>
<a href="tel:727-214-2508" value="+17272142508">727-214-2508</a> - Fax<br>
<a href="http://bryanfields.net" rel="noreferrer" target="_blank">http://bryanfields.net</a><br>
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</div></div></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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