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@contesting.com [mailto:tentec-bounces@contesting.com]
On Behalf Of OTAKEBI@aol.com
Sent: Monday, May 16, 2005 12:44 PM
To: tentec@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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