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<p>Hi Ken</p>
<p>My only experience with an HW101 VFO was with one that had failed
completely. I removed the VFO and found that the MPF105 JFET had
failed so I replaced it with a J310 and it worked with no further
problems.</p>
<p>If you have a local receiver that can hear the VFO you can
quickly determine if it is the oscillator or buffer stage that is
failing before you remove it.<br>
</p>
<pre class="moz-signature" cols="72">73
Bob
Bob F Burns G3OOU, G-QRP 6907, @BobFBurns
Crystal Palace Radio & Electronics Club: <a class="moz-txt-link-freetext" href="http://cprec.btck.co.uk/">http://cprec.btck.co.uk/</a>
Technical web site: <a class="moz-txt-link-abbreviated" href="http://www.qsl.net/g3oou">www.qsl.net/g3oou</a></pre>
<div class="moz-cite-prefix">On 05/03/2018 02:41, Kenneth G. Gordon
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:5A9CAE4C.5385.5D8F0202@kgordon2006.frontier.com">
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<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">I thought I would check here to see if
anyone beside myself had run into this problem: I am working
on a friend's HW-101 which he recently bought at a garage
sale for $50.00 with an HP-23 and a Heathkit speaker.</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">The HW-101 was extremely dirty, not having
been used for some time, but cleaned up well, and was
apparently very well-built.</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">The problem is that after the rig has been
on for a bit, the VFO quits. Completely.</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">I hooked my Tek 2467B scope to the output
coax and although when cold, the output is good and is a
pure-looking sine wave, within about 15 minutes at the
longest, the output amplitude begin to fall, then suddenly
completely disappears.</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">I have a "spare" HW-101 VFO here which I
"clip-leaded" into place, and with that one in operation,
the rig works exactly as it should. It even appears to be
properly aligned.</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">So...has anyone else here experienced such
an issue with an HW-101 VFO, and if so, what did you
discover?</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">I'm going to remove the bad VFO sometime
next week.</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">I suspect I will find a bad solder joint in
it somewhere, but I am also suspicious of a bad component.
But which one?</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">Also, are replacement Jackson ball-drives
still available? These are a bit rough.</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt"><br>
</span></font></div>
<div align="left"><font size="2" face="Arial"><span style="
font-size:10pt">Ken W7EKB</span></font></div>
<br>
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</pre>
</blockquote>
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