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Re: [TowerTalk] Tower and antenna decisions

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Tower and antenna decisions
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Sat, 26 Oct 2013 13:05:19 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On 10/26/2013 12:34 PM, Richard Solomon wrote:
That just shows the failings of SS Amps. A 1.3:1 SWR equates to 1.7%
reflected power. Any
Amp that can't handle that has no place in my shack.

As for tube amps, just shows the benefits of a tuneable Pi-Network.

My neighbor K6XX, the engineer at Elecraft who put the KPA500 into production and has done extensive testing of many competing amplifiers, observes that the IMD produced by a solid state power amplifier rises rapidly with a mismatched load, and also when operating too close to its limits. To prevent this, the firmware in the KPA500 limits power output, and also causes it to fold back with SWR around 2:1. Both of us run tube amps for contesting.

73, Jim K9YC
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