While it is "satisfying" to think of the ATU matching capability in
terms of SWR, that is not entirely valid.
A lot depends on frequency - at higher frequencies the "SWR matching
range" will be greater than on lower frequencies.
The only valid spec for the matching range is the available inductance
and capacitance in the ATu, as well as the step size. The Elecraft
tuners do state that in their specifications.
The range for the Elecraft tuners is often quoted as a 10:1 SWR, but
that depends on a lot of factors, such as the frequency and the exact
impedance to be matched.
You may take the inductance/capacitance values in the Elecraft tuner
specs as well as the step size and run that data through an application
like TLA for windows (On the ARRL Antenna book CD or download from the
ARRL website) to find the actual SWR range that can be matched on any
tuner. The resulting data is more informative than simply stating that
the ATU can match any particular SWR,
73,
Don W3FPR
On 1/31/2017 8:17 PM, K9MA wrote:
That's why ATU specs call out the
SWR range.
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