[TenTec] Pegasus/Jupe Band Scope Questn

[n4lq]

I had a Flex SDR here for a while and it has the most beautifully 
defined bandscope I've ever seen It makes the ICOM PROs look like trash. 
It takes the I and Q signals from the "Tayloe" detector, which is just 
wideband audio, and plots a trace on the scope. Of course you are 
limited to 20khz but that is plenty. So really, this is a matter for the 
software engineers. 
N4LQ

-----Original Message-----
From: "Mark Erbaugh" <mark at microenh.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Date: Wed, 23 Feb 2005 10:59:56 -0500
Subject: Re: [TenTec] Pegasus/Jupe Band Scope Questn

> > 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?
> 
> I asked Gary Barbour at TenTec the same questions a while back.
> 
> In sweep mode, the Jupiter firmware does bypass the AGC and it would be
> possible to add that mode (AGC off) as a setting for use with external
> sweeps.
> 
> However, I'm considering another alternative. There is a mod to the
> Pegasus
> and Jupiter that brings the 12 kHz IF out to the spare jack on the back
> of
> the radio. This IF is normally fed to a computer soundcard where it is
> used
> to decode DRM (digital shortware broadcast) signals. This IF is
> unaffected
> by the digital AGC in the radio (as it is still in the analog stages of
> the
> radio). This signal could be analyzed in the a computer program to
> provide a
> sweep.  There would have to be some coordination between the analog
> tuning
> and the signal received, but it should be possible to get a nice sweep
> display.  In fact, it should be possible to provide a real time band
> sweep
> of signals adjacent to the current signal, at least those within the
> width
> of the 20 kHz roofing filter.
> 
> 73,
> Mark
> 
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