[TenTec] 2.033

[Gary Hoffman]

Well....you are asking for an opinion...always a dangerous thing !  <grin>

But....

In my opinion, if one could choose, in the case of SSB (which is
comparatively wide band, but highly correlated) the better choice would be
the correlation based filter.  This removes noise Inside the pass band.
Since SSB needs a fairly wide pass band, then band pass based filters tend
to be limited in effectiveness.

For CW the choice is less clear.  CW is narrow band, and highly correlated.
But it is also very rapidly choppy.  So, a narrow pass band filter can do a
very good job.  So can a correlation based filter, but it might have trouble
tracking the very high levels of chop.  Might make a mess of the signal,
depending on how well it is implemented.  So, I might tend to want to choose
a very narrow band pass filter for that case.

I guess I just said I want both....didn't I ?  <grin>

If I could never the less have only one....I'd have to choose the
correlation filter, because I do a lot of SSB work, as well as some wider
digital stuff like RTTY and PSK  (yes, I know those are kinda narrow
compared to SSB, but wider than CW too).

In any case, any radio I would buy would likely have narrow band pass
filters available anyway, so the correlation filter would add the greatest
Incremental value, for me.

YMMV.

Regards,

Gary, AA2IZ


----- Original Message ----- 
From: "Douglas Shock" <douglas.shock at gmail.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Thursday, May 04, 2006 2:26 PM
Subject: Re: [TenTec] 2.033


> Let me pose a question to you guys:
>
> Regarding the NR function in the Orion
>
> What approach would be best suited if TenTec allowed you to choose your
> poison?
>
> On 5/4/06, Gary Hoffman <ghoffman at spacetech.com> wrote:
> >
> > Grant,
> >
> > Actually I've now gotten several off-line requests for just such a
> > reference.  I used to have several books and magazines that talked about
> > it.
> > I've told everyone that I will go and search through the "stuff" I've
got
> > in
> > the house and see if I can find any of those documents.  I used to have
a
> > lot of these references.
> >
> > Regards,
> >
> > Gary, AA2IZ
> >
> >
> > ----- Original Message -----
> > From: "Grant Youngman" <nq5t at comcast.net>
> > To: "'Discussion of Ten-Tec Equipment'" <tentec at contesting.com>
> > Sent: Thursday, May 04, 2006 2:03 PM
> > Subject: Re: [TenTec] 2.033
> >
> >
> > > > As to what I am trying to prove - nothing.  This is just a
> > > > way in which DSP can be done, and it does not work by using
> > > > any sort of spectral information or filters.  I've noticed
> > > > that many here are not familiar with this approach.
> > >
> > > It actually sounds familiar as you describe it, and I'm reasonably
sure
> > I've
> > > come across some material that may be what you're describing.  Of
> > course,
> > > today I can't find it.
> > >
> > > Any chance you can point to a web source with some information?  I
> > purchased
> > > the book that Jerry referenced in an earlier email -- maybe it will be
> > > discussed in there.
> > >
> > > Thanks ... Grant/NQ5T
> > >
> > >
> > > _______________________________________________
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> > > http://lists.contesting.com/mailman/listinfo/tentec
> > >
> > >
> >
> >
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> >
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