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@alum.mit.edu>
To: <tentec@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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