Owen Duffy wrote:
The capability of a tuner is much more complex (pardon the pun), but
could be mapped for each band to a Smith Chart as an area of input Z
that could be transformed to 50 ohms, and then one could plot loss
contours to show the acceptable range.

Here's what my IC-756PRO manual says about its internal
tuner: "*Matching impedance range: HF bands, 16.7 to 150
ohms unbalanced (Less than VSWR 3:1)"
--
73, Cecil http://www.qsl.net/w5dxp