[1000mp] Roofing filter

[Joe Subich, K4IK]

>    Previous discussions about a narrow roofing filter 
> in the FT-1000MP indicated it would greatly reduce the
> effectiveness of the noise blanker. I would be interested 
> to hear more comments on this subject.

According to W2VJN noise blanker operation is improved by 
the roofing filter.  I suspect there are a couple of 
reasons ... (1) the noise blanker no longer has to deal 
with strong off frequency signals and transient IMD 
effects that can mimic noise (2) the filter is a six pole 
unit which has relatively wider skirts and a flatter 
phase response which reduces pulse stretching. 

George also commented that the MP/MKV noise blanker 
stretched the pulse (blanking interval) itself so the 
blanking interval and noise pulse were more closely 
matched with the roofing filter.  

73, 

   ... Joe, K4IK