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
> http://lists.contesting.com/mailman/listinfo/tentec
>
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|