Does anyone have any comments about the Q of the L network section in Pi-L
networks? I have seen it suggested that the impedance at the middle of the
pi-L should be the geometric mean of the input and output impedances: the Q
of the L will then be given by
Q = sq.rt.(Ri - Rl)/Rl
where Ri is the intermediate impedance in the Pi-L (i.e. the geometric mean)
and Rl is the load impedance (usually 50 ohms)
For an 1800ohm plate load, this gives a Q of 5 for the L section, which
appears to be the right order of magnitude.
Of course, the Pi section would run at the usual Q - 10 to 15, or so.
Comments, please?
73
Peter G3RZP
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