[TenTec] Orion 2.055 Observations

[Ralph Young]

-----Original Message-----
From: tentec-bounces at contesting.com [mailto:tentec-bounces at contesting.com]
On Behalf Of Larry Menzel
Sent: Saturday, March 04, 2006 11:07 AM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Orion 2.055 Observations

Hey, guys, how 'bout a user's net on 75 some evening?

Maybe someone can suggest a frequency that works for all, and then get
together on the air.  I suggest somewhere around 3850 some evening, perhaps
on the weekend and see if we can communicate on these and other issues?

What say?  Bill, you wanna be the moderator?  I know we can hear east coast
from midwest almost every evening after about 0200Z.

Larry, N0XB


----- Original Message -----
From: "Bill Tippett" <btippett at alum.mit.edu>
To: <tentec at contesting.com>
Sent: Saturday, March 04, 2006 7:20 AM
Subject: Re: [TenTec] Orion 2.055 Observations


> N8ME:
>
> >Maybe I'm wrong, but can I assume that the narrower filters have a 
> >greater
> minimum length?  If so, my observations have a strange quirk.  I don't
> remember the exact numbers, but as I was reducing the bandwith from say,
> 1000 Hz, at 280 Hz, the filtering went wide open. However, when I 
> continued
> down to 270 Hz, the filtering was restored.  Then at 200 no filtering, 190
> filtering, etc.
>
>         If you are doing this test with low Tap
> settings, you may want to look at the response
> with a spectrum analysis program before concluding
> there is a real problem.  With a low number of taps,
> the DSP filter may become like a comb response
> with multiple peaks off the primary response.  These
> can fool your ears depending on what the spectrum
> response is.  It may sound like filtering is "wide
> open" to your ears, when in fact it is not.  This
> applies both to single 10 Hz BW changes and to
> single Tap setting changes.  One small change can
> sound very dramatic to your ears.
>
>         It's interesting to experiment with Tap
> settings for very weak signals. I sometimes
> prefer less than the maximum 199 for weak
> signals and narrow bandwidths.  For example,
> 154 and 99 sometimes seem better under certain
> noise conditions.  I don't believe there's any
> substitute for simply experimenting to find what
> produces the best S/N for your ears under the
> specific noise conditions.  There is no magic
> "set and forget" setting that works for all
> conditions.
>
>                                         73,  Bill  W4ZV
>
>
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>
> 

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