[Heath] HM-2103 RF load help or thoughts

[Dave Edwards]

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.
But....might still do it!

On 12/27/13 4:08 PM, Robert Groh wrote:
> Try changing the cap out with the one you have - yes, definitely worth 
> a try
>
> 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.
>
> Bob Groh
>
>
> ------------------------------------------------------------------------
> *From:* Dave Edwards <kd2e at comcast.net>
> *To:* Heath at puck.nether.net
> *Sent:* Friday, December 27, 2013 7:45 AM
> *Subject:* [Heath] HM-2103 RF load help or thoughts
>
> I have one of these dummy load/wattmeters.
> The wattmeter is WAY off as far as accuracy.
> I decided to go through the alignment.
> What supposed to be a deep null in the balanced bridge
> circuit, when adjusting a ceramic trimmer cap...is just a slight null.
> Floating around in the cabinet, I found a half moon shaped oval piece of
> something. It seems to be a broken off piece of the wiper half of the
> trimmer cap!
> So...putting two and two together, I suspect the trimmer cap!!! 
> (Rocket Science!)
> It is a 3 lead 2 - 18.5 pF ceramic trimmer.
> The closest I can find is 5 - 30 pF
> As a group....before I spend the cash, and gut the thing....Do you
> think that is enough in the ballpark that it will work??
> OR...
>
> Anyone have a 2 -18.5 ceramic trimmer?
> Heath PN 31-53   or    31-57
>
> Thanks for spinning your wheels on this.
>
> Happy Holidays!
> Dave
> KD2E
>
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