Thanks for the explanation. That seems to pretty much answer everyone's
questions concerning roofing filter cut in.
Bob, 5B4AGN
----- Original Message -----
From: "Sinisa Hristov" <shristov@ptt.yu>
To: <tentec@contesting.com>
Sent: Friday, August 06, 2004 8:55 AM
Subject: Re: [TenTec] Orion Roofing Filter Cut In
> Bob Henderson wrote:
>
> > Which, I guess, brings us back to the
> > original question about whether switching roofing filters at DSP b/w =
75%
> > roofing b/w is optimum or unecessarily conservative?
>
>
> I'd say it is quite good. Only the flat [central] part
> of roofing filter's passband passes through the DSP filter
> and DSP filter's passband flatness is mostly preserved.
>
> Also, group delay variation occures mostly at band edges,
> and is avoided this way.
>
>
> 73,
>
> Sinisa YT1NT, VA3TTN
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