Chris,
The KAT3 (like other Elecraft tuners) is an L network type tuner, and
should provide good efficiency. For your particular situation, I
suggest that you use something like the TLW application (from
www.arrl.org) and calculate the L network configuration needed for your
impedance range. TLW will also give you efficiency numbers. The 'fact
of life' that deals with added loss due to signal routing on the PC
board should be minimal, but if you add 5 or 10% additional loss to
account for the physical mounting of the components, you should be 'in
the ballpark'.
Yes, you will have to know the reactance before you can obtain the
really correct answer. L network tuners are generally more efficient
than the common Tee type tuners, but I am generalizing here, and
exceptions are always present. The PI network is typically efficient
too, but the output capacity required becomes very large at low
impedances. If you want real efficiency, consider a link coupled tuner
(like the Johnson Matchbox), but you sacrifice convenience for improved
efficiency figures - the link coupled tuner does not lend itself well to
bandswitching or to an auto-tuning application except over a very
limited range (one ham band or less).
73,
Don W3FPR
Chris G3SJJ wrote:
Does anyone have any figures on efficiency of KAT3 for load impedances
of 20 and 200 ohms? (reactance not known at this stage.)
Chris G3SJJ
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