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Thanks....I have another Heath wattmeter, an HM-102, that I built in
1974. It uses the same trimmer. Since it has a bum meter movement, I
was thinking of gutting out that trimmer. I was hoping to find a
replacement meter movement for that one...not to use it for a parts
unit. <br>
But....might still do it!<br>
<br>
<div class="moz-cite-prefix">On 12/27/13 4:08 PM, Robert Groh wrote:<br>
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<div style="color:#000; background-color:#fff; font-family:times
new roman, new york, times, serif;font-size:12pt">Try changing
the cap out with the one you have - yes, definitely worth a try<br>
<br>
I have some ceramic trimmers but I think my 'low C' ones are 2
to 11 pF. I'll spend some quality time in the basement looking
this afternoon.<br>
<br>
Bob Groh<br>
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<hr size="1"> <font face="Arial" size="2"> <b><span
style="font-weight:bold;">From:</span></b> Dave
Edwards <a class="moz-txt-link-rfc2396E" href="mailto:kd2e@comcast.net"><kd2e@comcast.net></a><br>
<b><span style="font-weight: bold;">To:</span></b>
<a class="moz-txt-link-abbreviated" href="mailto:Heath@puck.nether.net">Heath@puck.nether.net</a> <br>
<b><span style="font-weight: bold;">Sent:</span></b>
Friday, December 27, 2013 7:45 AM<br>
<b><span style="font-weight: bold;">Subject:</span></b>
[Heath] HM-2103 RF load help or thoughts<br>
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<div> I have one of these dummy load/wattmeters. <br>
The wattmeter is WAY off as far as accuracy. <br>
I decided to go through the alignment.<br>
What supposed to be a deep null in the balanced bridge
<br>
circuit, when adjusting a ceramic trimmer cap...is
just a slight null. <br>
Floating around in the cabinet, I found a half moon
shaped oval piece of <br>
something. It seems to be a broken off piece of the
wiper half of the <br>
trimmer cap!<br>
So...putting two and two together, I suspect the
trimmer cap!!! (Rocket Science!)<br>
It is a 3 lead 2 - 18.5 pF ceramic trimmer. <br>
The closest I can find is 5 - 30 pF<br>
As a group....before I spend the cash, and gut the
thing....Do you <br>
think that is enough in the ballpark that it will
work??<br>
OR...<br>
<br>
Anyone have a 2 -18.5 ceramic trimmer?<br>
Heath PN 31-53 or 31-57<br>
<br>
Thanks for spinning your wheels on this.<br>
<br>
Happy Holidays!<br>
Dave<br>
KD2E<br>
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