[TenTec] O2_dreps_top_spot

[Dr. Gerald N. Johnson]

On Tue, 2008-02-19 at 09:42 -0500, Barry N1EU wrote:
> On Feb 19, 2008 9:32 AM,  <pa5mw at home.nl> wrote:
> > The bandwidth control IS still unsurpassed by today. Turn BW down to 100Hz and you get the same great audio as with any width. NO ringing, NO digital artifacts.
> > That is unique. I still find that amazing and its more than I ever expected.
> 
> I like the narrow filtering as well.  The reason it doesn't ring at
> 100hz is because the filter slopes are fairly shallow compared with
> other radios, even with the Orion filtering set to 199 Taps.  To some
> extent, the filter is really broader than indicated because of the
> shallow slopes.  That's the way I like it, but it should be understood
> why you're hearing what you're hearing.
> 
> 73,
> Barry N1EU

Yah sure the DSP narrow filter has super time response. What about the
infinitesimal bandwidth hardware roofing filter, original manufacturer
or after market? There's practically nothing the DSP can do to repair
that ringing damage.

73, Jerry, K0CQ