<div dir="ltr">Well stupid me for not listening to you guys. I guess the hamtronics is really sensitive to low impedance outputs, and the highs get cut off if you have any sort of load at all. When I turned on the internal amplifier, the RTCM was happy with calibrating squelch. <div><br>Can anybody explain to me what "Diode calibration" means?</div><div><br></div><div>73,<br>Skyler</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Mar 30, 2016 at 5:42 PM, Joe Leikhim <span dir="ltr"><<a href="mailto:rhyolite@leikhim.com" target="_blank">rhyolite@leikhim.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
  
    
  
  <div bgcolor="#FFFFFF" text="#000000">
    Skyler;<br>
    <br>
    Here is a wideband VHF 136-156 MHz radio that will solve your ham
    club problems for $35 each. If these were UHF I would be buying a
    bushel full. You will need to get the programming software from
    Ritron. I think it is free.<br>
    <br>
    There are similar models with an enclosure, but for much more $$.<br>
    <br>
    See the auction below on E-Bay: <br>
    <br>
    Seller dale575<br>
    <br>
    Ritron VHF Transceiver PCA, 136-156MHZ, 5 Watt, Model DTX-142-GCWD-I<br>
    <br>
<a href="http://www.ebay.com/itm/Ritron-VHF-Transceiver-PCA-136-156MHZ-5-Watt-Model-DTX-142-GCWD-I/191557457767?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D35389%26meid%3D4bbbffc700cc4aefba654c3ce0d394f8%26pid%3D100005%26rk%3D2%26rkt%3D6%26sd%3D401085025343" target="_blank">http://www.ebay.com/itm/Ritron-VHF-Transceiver-PCA-136-156MHZ-5-Watt-Model-DTX-142-GCWD-I/191557457767?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D35389%26meid%3D4bbbffc700cc4aefba654c3ce0d394f8%26pid%3D100005%26rk%3D2%26rkt%3D6%26sd%3D401085025343</a><div><div class="h5"><br>
    <br>
    <br>
    <div>On 3/30/2016 12:11 PM, Skyler F wrote:<br>
    </div>
    <blockquote type="cite">
      <div dir="ltr">Factory tuned from the factory. And I don't even
        have a signal generator / counter good for RF. We got one
        hamtronics board, and won't buy another until we get this one
        working.</div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Wed, Mar 30, 2016 at 10:08 AM, Joe
          Leikhim <span dir="ltr"><<a href="mailto:rhyolite@leikhim.com" target="_blank">rhyolite@leikhim.com</a>></span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div bgcolor="#FFFFFF" text="#000000"> Were these receivers
              factory built and tuned or did individual club members
              build them? Either way, you might try others from the lot.
              If you have only a rudimentary signal generator and / or
              frequency counter, perhaps I can walk you through some
              "field expedient" steps over the phone.
              <div>
                <div><br>
                  <br>
                  <div>On 3/30/2016 12:01 PM, Skyler F wrote:<br>
                  </div>
                  <blockquote type="cite">
                    <div dir="ltr">I don't have the test equipment to go
                      through all of the dirty Local Oscilator, SINAD,
                      etc., so I will have to wait on that a few weeks
                      before the president of the club gets back in
                      town. 
                      <div><br>
                      </div>
                      <div>WHEN I bypassed the capacitor and resistor (
                        1k and .03µ) , the RTCM was able to calibrate
                        squelch. The LED flashed several times and then
                        was steady. Maybe the capacitor is the wrong
                        value. There was no code on it, but based on the
                        resistor code, the value was correct. </div>
                      <div><br>
                      </div>
                      <div>73</div>
                      <div>Skyler</div>
                    </div>
                    <div class="gmail_extra"><br>
                      <div class="gmail_quote">On Mon, Mar 28, 2016 at
                        4:08 PM, Joe Leikhim <span dir="ltr"><<a href="mailto:rhyolite@leikhim.com" target="_blank"></a><a href="mailto:rhyolite@leikhim.com" target="_blank">rhyolite@leikhim.com</a>></span>
                        wrote:<br>
                        <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">If you are using an
                          external reference, you cannot make up for the
                          2nd LO error if it is wildly off. There is an
                          easy SINAD related test in EIA-603 that is
                          called Offset Acceptance Bandwidth that would
                          indicate if the IF were off center. Things
                          that could go wrong apart from simple
                          misalignment of the Quad Detector coil could
                          include the LO crystal being way off
                          frequency, the IF filters being wrong BW or
                          off spec pass frequency.<br>
                          <br>
                          Given the symptoms, I am putting my money on a
                          misadjusted quad coil.<span><font color="#888888"><br>
                              <br>
                              Joe</font></span><span><br>
                            <br>
                            On 3/28/2016 5:06 PM, Bryan Fields wrote:<br>
                            <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> On 3/28/16
                              2:51 PM, Joe Leikhim wrote:<br>
                              <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> 1) Make
                                sure the receiver First Local Oscillator
                                is adjusted correctly<br>
                                on frequency. (Fo -10.700 MHz) Likewise
                                the second LO should be at<br>
                                around 10.2450 MHz. The second LO is not
                                adjustable, so any minor error<br>
                                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<br>
                                discriminator coil T2 which responds to
                                10.7000 MHz from a signal<br>
                                generator, has an S curve response.  In
                                my experience with these sort of<br>
                                Quadrature  Detector chips, you can get
                                a false sense of IF centering<br>
                                where the noise component is suppressed.
                                You might try adjusting for<br>
                                maximum noise first without the 10.7000
                                MHz signal. Be careful you don't<br>
                                jam the coil slug.<br>
                              </blockquote>
                              These are both very good points i didn't
                              consider.  I normally don't check my<br>
                              reference oscillators in the hamtronics as
                              they are using an external 10MHz<br>
                              source.<br>
                              <br>
                              You will want to check SINAD on it as
                              well, if it's not making spec (and those<br>
                              hamtronics are very sensitive), something
                              else is wrong with it.<br>
                              <br>
                            </blockquote>
                            <br>
                            -- <br>
                          </span><span> Joe Leikhim<br>
                            <br>
                            <br>
                            Leikhim and Associates<br>
                            <br>
                            Communications Consultants<br>
                            <br>
                            Oviedo, Florida<br>
                            <br>
                            <a href="mailto:JLeikhim@Leikhim.com" target="_blank">JLeikhim@Leikhim.com</a><br>
                            <br>
                            <a href="tel:407-982-0446" value="+14079820446" target="_blank">407-982-0446</a><br>
                            <br>
                            <a href="http://WWW.LEIKHIM.COM" rel="noreferrer" target="_blank">WWW.LEIKHIM.COM</a><br>
                            <br>
                          </span>
                          <div>
                            <div>
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                          </div>
                        </blockquote>
                      </div>
                      <br>
                      <br clear="all">
                      <div><br>
                      </div>
                      -- <br>
                      <div>
                        <div dir="ltr"><font color="#38761d" face="arial
                            narrow, sans-serif">Skyler Fennell</font>
                          <div><font color="#38761d" face="arial narrow,
                              sans-serif"><a href="http://amsatnet.info" target="_blank">amsatnet.info</a></font></div>
                          <div><font color="#38761d" face="arial narrow,
                              sans-serif">KDØWHB</font></div>
                          <div><font color="#38761d" face="arial narrow,
                              sans-serif"><a href="mailto:electricity440@gmail.com" target="_blank">electricity440@gmail.com</a></font></div>
                        </div>
                      </div>
                    </div>
                  </blockquote>
                  <br>
                  <pre cols="72">-- 
Joe Leikhim


Leikhim and Associates

Communications Consultants

Oviedo, Florida

<a href="mailto:JLeikhim@Leikhim.com" target="_blank">JLeikhim@Leikhim.com</a>

<a href="tel:407-982-0446" value="+14079820446" target="_blank">407-982-0446</a>

<a href="http://WWW.LEIKHIM.COM" target="_blank">WWW.LEIKHIM.COM</a></pre>
                </div>
              </div>
            </div>
          </blockquote>
        </div>
        <br>
        <br clear="all">
        <div><br>
        </div>
        -- <br>
        <div>
          <div dir="ltr"><font color="#38761d" face="arial narrow,
              sans-serif">Skyler Fennell</font>
            <div><font color="#38761d" face="arial narrow, sans-serif"><a href="http://amsatnet.info" target="_blank">amsatnet.info</a></font></div>
            <div><font color="#38761d" face="arial narrow, sans-serif">KDØWHB</font></div>
            <div><font color="#38761d" face="arial narrow, sans-serif"><a href="mailto:electricity440@gmail.com" target="_blank"></a><a href="mailto:electricity440@gmail.com" target="_blank">electricity440@gmail.com</a></font></div>
          </div>
        </div>
      </div>
    </blockquote>
    <br>
    <pre cols="72">-- 
Joe Leikhim


Leikhim and Associates

Communications Consultants

Oviedo, Florida

<a href="mailto:JLeikhim@Leikhim.com" target="_blank">JLeikhim@Leikhim.com</a>

<a href="tel:407-982-0446" value="+14079820446" target="_blank">407-982-0446</a>

<a href="http://WWW.LEIKHIM.COM" target="_blank">WWW.LEIKHIM.COM</a></pre>
  </div></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>
</div>