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Date: Sun, 11 Aug 2002 15:03:50 -0700
From: Wayne Burdick <n6kr at elecraft.com>
Organization: Elecraft
To: Steve Knell <stevek at camelcom.com>
Cc: elecraft at mailman.qth.net
Subject: [Elecraft] Re: KPA100 - Reflected Power - Output Limiter



Steve Knell wrote:

> "...someone at WRTC was trying to use a K2+KPA100 in the contest but could
> only get 50W out due to the high reflected power limiting circuitry.  This
> limiter is activated when the SWR is greater than 1.2:1..."
> 
> Is there any truth in this statement?  1.2:1 sounds a bit low to be limiting
> the power output.


Steve, with the production KPA100 firmware, SWR-based power reduction
begins above 1.5:1. (It was originally 1.2:1, but that was only in early
field-test versions.)

This is intended to protect the amplifier. The lower the power output,
the higher the SWR is allowed to be before any reduction occurs.

73,
Wayne
N6KR

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