[Elecraft] K3 - Diversity Reception, Matched Roofing Filters

[Bill W4ZV]

Walter V. Gilles wrote:
> 
> Am I correct in my understanding that for diversity reception with the
> KRX3, and using all 8 pole roofing filters (same 8 pole BW in same slots
> for main and sub boards), that matching of filters is unnecessary due to
> the inherent 8 pole filter zero offset?  Conversely, matching of filters
> for diversity only applies if one uses offset 5 pole filters?  Thanks.
>  
> Walter, N0DZJ
> 

Theoretically true, but 8-pole filters do not necessarily have zero offset. 
Several folks have measured actual offsets of up to 80 Hz, which could be
significant for a narrow CW filter (e.g. 80 out of the "250" 8-pole's actual
BW of 370 is >20%).

73, Bill



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