With an L network antenna tuner there are always at least two possible
combinations of L and C to provide a match. Under certain conditions of the
source and load impedances, there are four possible combinations of the L
and C that provide a match.
This multiplicity of possibilites allows you to choose the least loss
combination of the L and C determined by realizability of the L and/or C
The circuit Q is not under the control of the designer. The only way to
control Q is to increase the complexity over a single L and a single C
component. However, if higher Q is desired for harmonic suppression, it is
best/easiest to connect a low pass filter in the rig to tuner 50 ohm line.
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