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Did you try putting about 330pf across the primary of T11 (PA output
transformer). That will make a big difference...


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-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Skip
Davis via Groups.Io Sent: Saturday, May 12, 2018 1:27 PM
To: [email protected]
Subject: Re: [BITX20] boosting the power on 28 MHz #ubitx

Allison I tried the 220pf cap on RV1 and didn’t see any gain at 28
MHZ. I also tried removing the feedback resistors in the finals
suggested by Farhan without any gain. What I also have done was the
capacitor/choke mod suggested by Howard for the driver stages and that
has worked. With RV1 set to 10 watts on 40 meters I now get about 2.5
watts on 28 MHZ up from the 1.25 - 1.5 watts before. I also see about
8 or 9 watts on 20 meters. I’m running Ian’s firmware I think version
1.06 something.

Skip Davis, NC9O




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