I was responding to someone who wanted to use a analog notch filter
instead of a digital one. Do you really think that a analog filter
works better? I'll disagree with that kind thinking any day of the week.
At 07:09 PM 4/4/2006, Robert McGwier wrote:
>In the PowerSDR/SDR-1000 software there is a block LMS automatic notch
>filter that I should have enhanced with a manual notch a long time ago
>for CW in particular. That said, this operates on complex signals and
>produces a complex signal. It does not hurt the image and is the single
>most distortion free notch filter I've ever listened. I myself have
>been caught with "analog old think" multiple times this year (such as
>the AM modulation). It is understandable but as in my own cases, you
>are incorrect.
>
>Bob
>
>
>
>
>KD5NWA wrote:
> > I and Q signals depend on their phase relationship in order for it to
> > work correctly, something like a notch filter will mess up that
> > relationship and render them useless. Besides the main point of a QSD
> > receiver is for the CPU to do the filtering, which it can do 10X
> > better than any discrete filter can. Keep the hardware simple, do the
> > complex in the CPU.
> >
> >
> >
>
>
>--
>AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
>NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
>Laziness is the number one inspiration for ingenuity. Guilty as charged!
>
>
>
>
>Yahoo! Groups Links
>
>
>
>
Cecil Bayona
KD5NWA
www.qrpradio.com
"Windows the worlds most successful software virus"
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