Some mention of "high" SWR. What exactly is high SWR? Some folks consider
2:1 as high while other consider 10:1 as high. I think we'd all agree that
10:1 is indeed high.
I've found that Tentec PA's are happy with 3:1 SWR or less. Now then
there's two conditions that cause a 3:1, being a load of 150 ohms or 16.6
ohms. The latter is more likely to cause a problem.
At the same time, I have demonstrated an open condition on the antenna does
not cause as problem as the current values are low, as well as a short on
the antenna where the current value is high. The difference is that the
current overload takes control where the SWR is due to a very low load Z
causing PA current to exceed 20 amps.
73
Bob, K4TAX
----- Original Message -----
From: "Duane Calvin" <ac5aa1@gmail.com>
To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
Sent: Thursday, March 12, 2009 5:44 PM
Subject: Re: [TenTec] Orion2 auto tuner
You said: "no matter what the SWR is" . . . If the SWR is 4:1, the tuner
will not have found a tuned condition, and the "tuned" indicator will not
go
on, and the tuner will be disengaged. I don't recall the exact number,
but
I believe it has to be below 2:1 SWR to be considered tuned. The Orion's
final amplifier section is designed to handle 2:1 SWR (unlike many other
rigs), so that is not a problem for the Orion. Are you saying yours says
"tuned" regardless of a high SWR? I'm trying to understand whether you're
describing a problem with your rig, or a behavior of the Orion which you
don't agree with.
73, Duane
Duane Calvin, AC5AA
Austin, Texas
www.ac5aa.com
-----Original Message-----
From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
On Behalf Of george
Sent: Thursday, March 12, 2009 5:35 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Orion2 auto tuner
The "tuned" stays on, on my O2 no matter what the SWR is.
If I press the tune button again it then goes off but I assume that means
it
is in by-pass.
George W2YJ
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