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Sandy, my guess is that the rotor of the variable capacitor in the vfo is not grounding. The wiper contacts are dirty. If that is the case, I've never had success, at least long term success, with cleaning the contacts. Using a fairly heavy soldering iron, I carefully solder a piece of copper braid to the rotor of the variable cap and the cap's grounded frame. Just insure the braid is small enough to not interfere and that it neatly winds around the shaft as the cap is turned. That cures it! I do this on all heath VFO/LMO variable caps. <br><br>Mark VE3LU<br><br><div><div id="SkyDrivePlaceholder"></div><hr id="stopSpelling">From: ac1wye@gmail.com<br>To: Heath@puck.nether.net<br>Date: Mon, 9 Apr 2012 12:33:52 -0400<br>Subject: [Heath] SB-104A VFO question<br><br>
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</style><div class="ecxWordSection1"><p class="ecxMsoNormal"><i><span style="font-size:12.0pt;font-family:"Georgia","serif";color:#1F497D">Hello, gang,</span></i></p><p class="ecxMsoNormal"><i><span style="font-size:12.0pt;font-family:"Georgia","serif";color:#1F497D"> </span></i></p><p class="ecxMsoNormal"><i><span style="font-size:12.0pt;font-family:"Georgia","serif";color:#1F497D">My ‘104A is running fine, except for one little annoying thing: sometimes when tuning, the sensitivity of the optical encoder in the VFO gets weird (at least I think it’s an optical encoder…)</span></i></p><p class="ecxMsoNormal"><i><span style="font-size:12.0pt;font-family:"Georgia","serif";color:#1F497D"> </span></i></p><p class="ecxMsoNormal"><i><span style="font-size:12.0pt;font-family:"Georgia","serif";color:#1F497D">Once in a while, if I try to tune, say, less than a full kHz, the display and the frequency will jump a bunch. For instance, if I try to move just .1kHz, it’ll jump .4 or .5. If I wiggle the VFO knob and try again, it’ll settle down.</span></i></p><p class="ecxMsoNormal"><i><span style="font-size:12.0pt;font-family:"Georgia","serif";color:#1F497D"> </span></i></p><p class="ecxMsoNormal"><i><span style="font-size:12.0pt;font-family:"Georgia","serif";color:#1F497D">Loose ground somewhere, maybe?</span></i></p><p class="ecxMsoNormal"><i><span style="font-size:12.0pt;font-family:"Georgia","serif";color:#1F497D"> </span></i></p><p class="ecxMsoNormal"><i><span style="font-family:"Georgia","serif";color:#1F497D">73,</span></i></p><p class="ecxMsoNormal"><i><span style="font-family:"Georgia","serif";color:#1F497D"> </span></i></p><p class="ecxMsoNormal"><i><span style="font-family:"Georgia","serif";color:#1F497D">Sandy AC1Y</span></i></p><p class="ecxMsoNormal"><i><span style="font-family:"Georgia","serif";color:#1F497D"> </span></i></p><p class="ecxMsoNormal"><i><span style="font-family:"Georgia","serif";color:#1F497D">Alexander N. Gerli</span></i></p><p class="ecxMsoNormal"><i><span style="font-family:"Georgia","serif";color:#1F497D">5805 Newhall Road</span></i></p><p class="ecxMsoNormal"><i><span style="font-family:"Georgia","serif";color:#1F497D">Durham, NC 27713-2615</span></i></p><p class="ecxMsoNormal"><i><span style="font-family:"Georgia","serif";color:#1F497D">919-489-9638</span></i></p><p class="ecxMsoNormal"><i><span style="font-family:"Georgia","serif";color:#1F497D"> </span></i></p><p class="ecxMsoNormal"><i><span style="font-family:"Georgia","serif";color:#1F497D">A Scotsmen walks about 900 miles each year</span></i></p><p class="ecxMsoNormal"><i><span style="font-family:"Georgia","serif";color:#1F497D">Scotsmen drink about 40 gallons of whisky each year</span></i></p><p class="ecxMsoNormal"><i><span style="font-family:"Georgia","serif";color:#1F497D">Scotsmen get about 25 miles per gallon</span></i></p><p class="ecxMsoNormal"> </p></div><br>_______________________________________________
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