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[Amps] High Input Swr SB-220

To: <amps@contesting.com>
Subject: [Amps] High Input Swr SB-220
From: 2 at vc.net (2)
Date: Wed Mar 26 14:52:49 2003

>At 08:22 AM 3/26/03 -0800, Rich wrote:
>> > The fix is to up the design Q of the Pi tuned input to something that
>> > solid-state radios will take.  This is covered in the Nov./Dec., 1990 QST
>> > article. [orig manuscript on my Web site]
>
>I don't doubt this is the optimum solution, but necessary?  My TS-930 is 
>perfectly happy driving my unmodified SB-220 on all bands including 12 and 
>17 meters.  My Mark 5 is happy with it on every band but 40m, where the 
>power folds back a little because of the input SWR.  Again, it works fine 
>on 12 and 17m even though the input circuits were never designed for these 
>bands.
>
**  with a tuner to correct the problem of not enough Q in the tuned 
inputs, a Q of 2 - 3 is not needed.

-  R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, 
www.vcnet.com/measures.  
end

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