Re: [TenTec] Pegasus/Jupe Band Scope Questn

["Steve N4LQ" <n4lq@iglou.com>]

Does the bandwidth of the dsp affect the definition of the peaks on the 
scope? If so, wouldn't you need to do some demodulating?
Steve Ellington
N4LQ@iglou.com
----- Original Message ----- 
From: "Duane - N9DG" <n9dg@yahoo.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Tuesday, February 22, 2005 10:01 PM
Subject: Re: [TenTec] Pegasus/Jupe Band Scope Questn


> If you want to see the effects of this AGC speed limitation
> download Ten Tec's control program and run it on a decently
> fast PC of 2GHz or so. Set the band to say 40M at night and
> then bring up the sweep panel and then click on "Sweep". It
> will indeed sweep quite fast but you will also see a series
> of "saw teeth" on the display. The saw toothing effect is due
> to the decay time of the AGC being too long. For several new
> frequencies that sweep is tuning through the AGC will still
> be dropping even though there is no longer a strong signal
> there.
>
> I've been long convinced that a *new* "mode" that is
> specifically designed for sweeping could be done in firmware.
> This mode would not do any demodulation of signals of any
> kind. It would have essentially instant AGC decay, or no AGC
> whatsoever. All that it would/should do is measure signal
> strength and report it. If the DSP is only doing that then I
> would think that it could be made to go much faster while
> still providing a very nice sweeping action. Now I believe
> that the only choice is to pick one of the exiting modes and
> read its S-Meter value repeatedly.
>
> Duane
> N9DG
>
>
> --- Steve N4LQ <n4lq@iglou.com> wrote:
>
> > Thanks Carl. It makes sense. When the Jupiter does it's own
> > scan, it's much faster. 2 questions:
> >
> > Does the agc not affect the Jupe in standalone mode
> > scanning?
> >
> > Could a firmware change take care of this?
> >
> > Steve Ellington
> > N4LQ@iglou.com
> > ----- Original Message ----- 
> > From: "Carl Moreschi" <n4py@earthlink.net>
> > To: "Discussion of Ten-Tec Equipment"
> > <tentec@contesting.com>
> > Sent: Tuesday, February 22, 2005 9:34 PM
> > Subject: Re: [TenTec] Pegasus/Jupe Band Scope Questn
> >
> >
> > > Steve,
> > >
> > > I experimented with this a lot in developing the
> > software.  The limiting
> > > factor is the speed of the AGC.  If I run the sweep
> > faster, the AGC does not
> > > change quickly enough to give any decent resolution.  The
> > program has a
> > > loop that goes ike this:
> > >
> > > 1) Set a frequency
> > > 2) read S meter
> > > 3) plot a point on the graph
> > > 4) Go to step 1
> > >
> > > If you do this too fast, the returned S meter reading
> > does not change
> > > enough
> > > from the previous reading for good resolution.  I hope
> > this explanation is
> > > clear.
> > >
> > > 73,
> > >
> > > Carl Moreschi N4PY
> > > Franklinton, NC
> > > ----- Original Message ----- 
> > > From: "Steve N4LQ" <n4lq@iglou.com>
> > > To: <tentec@contesting.com>
> > > Sent: Tuesday, February 22, 2005 9:21 PM
> > > Subject: [TenTec] Pegasus/Jupe Band Scope Questn
> > >
> > >
> > >> What limits the speed of the Peg/Jup's band scope? When
> > I used the
> > > Jupiter's bandscope it was fairly fast but when using it
> > in Peg mode, it is
> > > really s l o wwww.
> > >> Is this the fault of the rig, firmware, comm port, pc
> > processor, software
> > > (N4PY) or what?
> > >> I want the sucker to really fly but I want to see it on
> > the computer, not
> > > the Jupe's little green display. What would it take? Has
> > anyone found
> > > anything that makes a difference?
> > >>
> > >> Steve Ellington
> > >> N4LQ@iglou.com
>
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