[TenTec] AL 811 High Input SWR with OMNI V

[Robert Carroll]

Based on experience with an AL80 I would suspect the amp is set up with the
slug tuned for the phone band and may not have enough BW for a low SWR
across the band.  You may have to use a compromise setting or if you are a
cw op only tune the slug low in the band.  I have seen a number of articles
suggesting that though your rig may drive a 3:1 load you may be placing it
at risk of damage due to elevated RF voltages.  I would shoot for 2:1 or
less.

Bob W2WG

-----Original Message-----
From: tentec-bounces at contesting.com [mailto:tentec-bounces at contesting.com]
On Behalf Of OTAKEBI at aol.com
Sent: Monday, May 16, 2005 12:44 PM
To: tentec at contesting.com
Subject: [TenTec] AL 811 High Input SWR with OMNI V

I bought an Ameritron AL811 Amp and hooked it up to my OMNI V.
On 10 meters the OMNI V meter on reflected power reads a little under 3 to 1

when I tune the amp using either the tune or a pulser.
My antenna SWR is flat and the problem seems to be from radio to amp.
When I go to SSB the meter on the OMNI V set to reflected reads flat.
I can whistle into the mike and get full output from the amp and the input 
SWR remains flat on SSB.
When the problem takes place on CW or Tune I still get full output from the 
amp but high input SWR.
IC shows under 20 amps even at high SWR on CW.
Questions:
Why only in CW?
Could it be the meter on the OMNI V getting RF? 
Has anyone had this experience?
What is causing this problem?
Does the OMNI V automatically fold back output as some of the other brands
or 
will it keep pumping out power even at high SWR causing damage to the
finals?
Thanks in advance.
Dan/N4VET
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