[Elecraft] Bird 43 Wattmeter calibration

[Jim Wiley]

Actually, the Bird type 43 wattmeter elements ("slugs") do have a 
calibration adjustment, but it is done at the factory.  The trimmer is 
located underneath the "frequency range & power" label, which is glued 
to the top of the element.  This adjustment is done once at the factory, 
and unless one of the components inside the element has been damaged, 
does not need adjustment.  A damaged slug usually makes itself known by 
being totally inoperative.  If you are unsure about the condition of a 
particular element, a quick comparison check between a known good unit 
will tell you all you  need to know.  Remember that because of 
calibration tolerances, you might see as much as 10% difference between 
two good elements.

- Jim,  KL7CC


J F wrote:

>Hello All,
>
>Does anyone have any suggestions for calibrating a
>Bird 43 and the respective slugs? I picked up a used
>one and would like to check it out.
>
>Thanks,
>Julius
>n2wn
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