Jim,
My data is straight out of the instruction book for the Bird Thruline
Wattmenter model 43. The accuracy is stated as +/- 5% of full scale.
Pure and simple, with no mention of what part of the scale you are
using. Perhaps the accuracy may be better than that, but that
specification is all we can count on without comparison with some better
standard. Lacking another standard, that is it.
DE N6KB
Jim WA9YSD wrote:
> I had to bring up the tolerance of the meter itself. Could not resist
> cause it brings into focus real accuracy and the misnomers that
> tolerances play on it.. It is more accurate than 5% full scale and the
> SWR gets twisted some what when tolerances is talked about. The design
> of the Bird had to have taken that into consideration. Been to long
> since I heard this argument. Gotta be 40 years ago.
>
> It has something to do with with the 1st, 2nd and 3rd part of the scale and
> 33.3333333...% or 66.66... % exponentially and the non linearity of the power
> curve. Been too long to remember this stuff. Decay rates have a similar
> cure but inverted. This is out of my realm. Please set this straight.
>
> Keep The Faith, Jim K9TF/WA9YSD
>
>
>
>
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