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Re: [Amps] Z of SB-200 input

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Subject: Re: [Amps] Z of SB-200 input
From: "Roy" <>
Date: Tue, 9 Sep 2008 10:48:22 -0500
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Trying to caculate the input circuit for Sb200
Wonder what  z  does two 572b GG cofigration presents[sb200].
Aron 4x1fq.

Hello Aron,

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,

Roy,   K6XK

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