Trying to caculate the input circuit for Sb200
Wonder what z does two 572b GG cofigration presents[sb200].
It is about 125 ohms. If you design a pi-network for that value, using
variable caps at the input and output, you can tune it easily for unity SWR
at the input. Example, for 40-meters, C1 = 900pF, C2 = 570pF and L = 1.30uH.
Operating Q = 2 with these values. Use larger value variable caps so you
have some range for adjustment purposes.
Good luck and 73,
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