Hi Lyle,
If you look at the larger values of attenuation (134 vs 115, or 113 vs
93) the result is mostly due to the difference in shape factor of the
roofing filter. Expressed differently, an 8-pole filter is likely to
have a steeper slope in its selectivity curve than a 5-pole filter.
But on the other hand, AFAIK, an 8 pole filter will tend to be more
likely to create higher distortion of the Nutzsignal due to group and
phase delay, ringing, etc. at each pole. So more poles is not always
better than less poles.
vy 73 de toby
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