On Tue, 07 Jun 2005 12:17:43 -0500, Cecil Moore
wrote:

Reg Edwards wrote:
If you can't get the internal SWR meter on an Icom 735 (or similar
rigs) down to exactly 1:1 then either there's something wrong with the
tuner or with the tuner operator.

My TS870 has an menu option for setting the "good enough" SWR using
the built-in tuner. The limits can be 1.2:1 or 1.6:1.

1:1 is not an option nor is it desired. If the feedback loop was
tight enought to always try to achieve 1:1 it would probably never
stop hunting.


What you say is true for roller inductor tuners, Reg,
but most tuners have switched inductors. The perfect
inductance may not be possible.


Nor is it required. With three reactances, coarse setting one and
varying the other two can achieve a perfect match. As I have said
many times, this may not be optimum from a loss or BW standpoint, but
you can get a match.