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Skyler;<br>
<br>
1) Make sure the receiver First Local Oscillator is adjusted
correctly on frequency. (Fo -10.700 MHz) Likewise the second LO
should be at around 10.2450 MHz. The second LO is not adjustable, so
any minor error would have to be made up with the TCXO U3. After
this second step:<br>
<br>
Then :<br>
<br>
2) Make sure the general alignment is set properly, especially the
discriminator coil T2 which responds to 10.7000 MHz from a signal
generator, has an S curve response. In my experience with these
sort of Quadrature Detector chips, you can get a false sense of IF
centering where the noise component is suppressed. You might try
adjusting for maximum noise first without the 10.7000 MHz signal. Be
careful you don't jam the coil slug.<br>
<br>
Joe Leikhim<br>
<br>
<div class="moz-cite-prefix">On 3/27/2016 7:48 PM, Skyler F wrote:<br>
</div>
<blockquote
cite="mid:CAJNyT08ksXQoduZtjc6G_RHNNKL62ML__uQm_D-YCQw5aP7=Zw@mail.gmail.com"
type="cite">
<div dir="ltr">I am getting 2v P-P</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Sun, Mar 27, 2016 at 5:33 PM, Skyler
F <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:electricity440@gmail.com" target="_blank">electricity440@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<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">
<div>
<div class="h5"><br>
<div class="gmail_quote">On Sun, Mar 27, 2016 at 5:08
PM, Bryan Fields <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:Bryan@bryanfields.net"
target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:Bryan@bryanfields.net">Bryan@bryanfields.net</a></a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex"><span>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>> 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>> 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 moz-do-not-send="true"
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><font color="#888888">--<br>
Bryan Fields<br>
<br>
<a moz-do-not-send="true"
href="tel:727-409-1194" value="+17274091194"
target="_blank">727-409-1194</a> - Voice<br>
<a moz-do-not-send="true"
href="tel:727-214-2508" value="+17272142508"
target="_blank">727-214-2508</a> - Fax<br>
<a moz-do-not-send="true"
href="http://bryanfields.net"
rel="noreferrer" target="_blank">http://bryanfields.net</a><br>
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<span class="">-- <br>
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<div dir="ltr"><font color="#38761d" face="arial
narrow, sans-serif">Skyler Fennell</font>
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<pre class="moz-signature" cols="72">--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
<a class="moz-txt-link-abbreviated" href="mailto:JLeikhim@Leikhim.com">JLeikhim@Leikhim.com</a>
407-982-0446
<a class="moz-txt-link-abbreviated" href="http://WWW.LEIKHIM.COM">WWW.LEIKHIM.COM</a></pre>
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