The Orion has protective circuitry to limit the current in the finals to a
safe value. There is no point where SWR "fold back" occurs. It just won't
let the current in the finals get too high. This is an excellent protection
method.
Carl Moreschi N4PY
Franklinton, NC
----- Original Message -----
From: "Pete Smith" <n4zr@contesting.com>
To: <tentec@contesting.com>
Sent: Friday, May 09, 2003 12:35 PM
Subject: Re: [TenTec] Orion SWR protection
> At 05:33 AM 5/9/03 -0400, you wrote:
> >The specification of "25 amperes" covers ORION's performance under all
> >specified
> >conditions, but if your antenna impedance is between 50 and 100 ohms,
> >including
> >moderate reactance, a 22-ampere power supply will run ORION at close to
> >full power. If
> >you must have full power under all specified conditions, ORION needs 25
> >amperes.
> >
> > Simple answer is, full rated power at SWR 2.0:1 and below.
>
> This looks suspiciously like a similar statement in my Mark 5 manual, but
> the Mark 5's protection kicks in rapidly and rather below 2:1 indicated,
> while that in the TS-930 comes into play more gradually. I guess I could
> have asked the question better -- how aggressively does the Orion ACTUALLY
> reduce the output power as the SWR approaches 2:1, and what part does
> reactance play in that? Presumably, it isn't just a question of 25-100
> ohms resistive... what is "moderate reactance," to borrow the term used in
> the manual?
>
> 73, Pete N4ZR
> The World HF Contest Station Database was updated 11 April 03.
> Are you current? www.pvrc.org/wcsd/wcsdsearch.htm
>
>
>
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