[TenTec] Pegasus vs. Argonaut V - CW Filter Bandwidth

[Duane Grotophorst]

I think bottom line tradeoff became tighter filter
skirts vs. good QSK performance. I’m convinced that
better filter skirts could be possible with the
Pegasus/Jupiter DSP hardware - if you are willing to
live with a longer TX/RX turnaround time. For high
speed CW ops that is not likely an acceptable
tradeoff.  I’m pretty sure that the ADSP2181 DSP of
the RX340 is the same as the Peg/Jup, but it doesn’t
attempt to switch between RX and TX though. 

Does anyone know if the 516 uses 2.5 KHz tunning steps
for the synthesizer and then make the final frequency
steps inside the DSP code like the Peg/Jup do? It is
an interesting synthesizer design strategy, however I
don’t think there is too much of a DSP horsepower
penalty to do the mathematical manipulations to
support the 2.5 KHZ tuning staps.

Duane
N9DG

--- Mark Erbaugh <mark@microenh.com> wrote:
> I certainly would like narrower filters and/or
> better skirts on the existing
> Pegasus filters. I was told by TenTec that  narrower
> filters would require
> more DSP processing, which isn't available in the
> Pegasus. I'm assuming that
> since the Argonaut V is 4+ years newer than the
> Pegasus, it has more DSP
> processing capability, hence the narrower filter.
> 
> Still, if TT would release the code to the Pegasus
> DSP, I'm sure someone
> could figure how to squeeze more filtering out of
> it...
> 
> 73,
> Mark
> 
> ----- Original Message -----
> From: "Bill Nicolson" <k2rig@comcast.net>
> To: <TenTec@contesting.com>
> Sent: Tuesday, October 29, 2002 9:45 AM
> Subject: [TenTec] Pegasus vs. Argonaut V - CW Filter
> Bandwidth
> 
> 
> > I don't know if anyone else has noticed but I for
> one would like to know
> if
> > Ten Tec could offer a 200 Hz min. bandwidth
> > on the Pegasus like they offer on the new Argonaut
> V?
> > I for one would prefer the tighter CW bandwidth
> even if I had to give up
> > something else. Or why not offer it as an option?
> > Carl (N4PY) what do you think?
> > 73 de Bill K2rig
> >
> > Bill Nicolson - K2RIG - K2 #1764
> > Colonia - New Jersey
> > E-Mail - k2rig@comcast.net
> > Web - http://mywebpages.comcast.net/k2rig
> >
> >
> >
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec@contesting.com
> >
> http://lists.contesting.com/mailman/listinfo/tentec
> >
> 
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