Mark,
Yes, I do think the airpax breakers do a fine job for this application.
Carl Moreschi N4PY
Franklinton, NC
----- Original Message -----
From: "Mark Erbaugh" <mark@microenh.com>
To: <tentec@contesting.com>
Sent: Saturday, February 14, 2004 11:21 PM
Subject: Re: [TenTec] Pegasus Erratic SWR readings
> Carl,
>
> That sounds like a good solution. Thanks for the kind words.
>
> Do you think the AirPax magnetic breakers provide sufficient over current
> protection?
>
>
> Mark
>
>
> ----- Original Message -----
> From: "Carl Moreschi" <n4py@earthlink.net>
> To: <tentec@contesting.com>
> Sent: Saturday, February 14, 2004 4:12 PM
> Subject: Re: [TenTec] Pegasus Erratic SWR readings
>
>
> > The Pegasus does not have over current protection and as such has a
small
> > exposure to an overcurrent situation blowing the finals. And this
> > overcurrent situation would most likely occur with a high SWR. I added
a
> > feature that allows you to set a maximum SWR (say 3 to 1) that once
> reached,
> > will drop the drive to the level you define (usually 50 watts). Because
> of
> > your excellent analysis on the pegasus SWR computation, I have now
> modified
> > my algorithm slightly. This change will be sent to everyone as Version
> 2.14
> > on March 1. What I am now doing is reducing drive power when the
> reflected
> > power reaches the value that would have caused the threshold SWR to be
> > reached if you were running 100 watts. In other words, I am just
looking
> at
> > reflected power to make this decision rather than SWR. This completely
> > solves the problem you described with SWR computation.
> >
> > 73,
> >
> > Carl Moreschi N4PY
> > Franklinton, NC
> > ----- Original Message -----
> > From: "Mark Erbaugh" <mark@microenh.com>
> > To: <tentec@contesting.com>
> > Sent: Saturday, February 14, 2004 5:19 PM
> > Subject: Re: [TenTec] Pegasus Erratic SWR readings
> >
> >
> > > Carl,
> > >
> > >
> > > > The idea of the power reduction feature is to reduce power BEFORE
the
> > > finals
> > > > blow. Adding a delay here defeats the purpose of the feature. I
> don't
> > > see
> > > > the erratic SWR with my pegasus.
> > >
> > > Most non-TT rigs are designed with hardware that will drop (fold back)
> the
> > > power output when a high SWR is sensed. However, TT has always claimed
> > that
> > > their finals can handle high SWR conditions and no fold back is
> required.
> > >
> > > Is your control program's fold back a indication that the Pegasus has
a
> > > problem in this area?
> > >
> > > I realize that there is no internal overcurrent protection in the
> Pegasus
> > > (except the main fuse, and I'm betting the finals will blow to protect
> > that
> > > fuse <g>). TT recommends the use of their power supplies which do have
> the
> > > overcurrent protection. I hope those who, like me, are using larger
> > supplies
> > > (I have an Astron 35 A) are using the AirPax magnetic breakers in
line.
> > >
> > > 73,
> > > Mark
> > >
> > > _______________________________________________
> > > TenTec mailing list
> > > TenTec@contesting.com
> > > http://lists.contesting.com/mailman/listinfo/tentec
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec@contesting.com
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> >
>
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