[TenTec] Orion 2.055 Observations

[Larry Menzel]

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
>
>
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
>