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1. [Amps] Duobanding a SB220 for 6m and 4m (score: 1): Author: Ian Roberts <itrmail2003@yahoo.com>; Date: Wed, 17 Aug 2011 12:14:07 -0700 (PDT); G'day, My SB220 is currently operating on HF and 6m (10 band was pinched and realigned) but was not optimised - gain is around 7x on 6m. This exceeds the max in ZS when driven by an IC-746 so there w; /archives//html/Amps/2011-08/msg00076.html (9,608 bytes)
2. Re: [Amps] Duobanding a SB220 for 6m and 4m (score: 1): Author: "Jim Garland" <4cx250b@muohio.edu>; Date: Thu, 18 Aug 2011 06:23:12 -0600; Hi Ian, You didn't mention modifying the plate choke, but I'm guessing that was an oversight. You'll need one with fewer turns than the original (roughly 10 percent of the inductance), and you'll als; /archives//html/Amps/2011-08/msg00082.html (9,556 bytes)

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