Bill:
Do you care to comment on the discussion that Steve and I are
having?
You seem to know your Orion inside and out.
73,
Bernard, WA4OEJ
----- Original Message -----
From: "Bill Tippett" <btippett@alum.mit.edu>
To: <tentec@contesting.com>
Sent: Thursday, August 05, 2004 8:25 PM
Subject: [TenTec] Re: Roofing filters
> Hi Grant,
>
> NQ5T wrote:
> >I was thinking "6Khz slot" when I made the comment above (brain on
> vacation), but
> generally my statement really was to say that it doesn't make sense to use
a
> narrower roofing filter than DSP bandwidth.
>
> In general I agree...especially on SSB. However there is one
case
> where
> you might want to use a narrower roofing filter than the DSP BW. For very
> narrow DSP CW BW's, DSP filters can have multiple passband sidelobes which
> do strange things to CW signals at the noise floor. Occasionally I use my
> 250 Hz roofing filter and set DSP higher to get rid of these sidelobe
effects.
>
> >I still sense confusion among some (you not included) about roofing vs.
> IF filtering in
> the flow of the discussion, however. And think we're getting bamfoozled
> to some
> extent by the option count :-)
>
> I agree. Outside of contests, I doubt most of us would ever need
> any of
> the optional filters. Orion, with just the 2.4 and 1.0 kHz roofing
filters is
> already far better than any other unmodified rigs on the market in terms
of
> strong signal handling, both on SSB and CW.
>
> 73, Bill W4ZV
>
>
>
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