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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