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[AMPS] SB-220 input circuit

To: <amps@contesting.com>
Subject: [AMPS] SB-220 input circuit
From: W8JI@contesting.com (Tom Rauch)
Date: Mon, 2 Aug 1999 19:35:49 -0400
Hi Pete,

> >From time to time we've seen posts about how the SB-220's input network
> >is
> badly designed for 10 meters, and that results in lower output.

Part of the problem is lead lengths and component tolerances, as 
well as wiring dress.

There is no solution other than dropping the panel and working on 
the input.
 
> Mine has a relatively high input SWR (ca. 1.8:1 on the part of 10 meters
> I'm interested in) and suffers from low 10m. output (ca. 800 watts at
> best), but even when I use the built-in tuner on my transceiver to match
> the input perfectly, the output doesn't rise significantly.  Why is this?

Does your rig normally shut down at that SWR? That would be the 
only ill effect.

73, Tom W8JI
w8ji@contesting.com

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