> >That's because the filters you tested are after the receivers analog
> >selectivity. Look at the 756PRO reviews coming out, where it is compared
> >to things like the 1000MP.
> >
>
> Which "that" are you referring to, Tom - the good low-noise performance of
> the selective DSP filters, or the ineffectiveness of the DSP noise
> reduction?
All of the above.
The noise reduction is ineffective, because the waveshape of noise
and signals are virtually the same once the noise passes through a
filter anywhere close to the same BW as the signal.
The DSP doesn't degrade S/N because the filter and AGC ahead of
the DSP makes levels almost the same.
Because of that, the DSP can only do a good job as a notch or a
passband filter. IF DSP's, with current technology in the equipment
we buy, aren't much better.
73, Tom W8JI
w8ji@contesting.com
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