[Elecraft] Roofing Filter question

[Barry N1EU]

Fred Atchley wrote:
> 
> The rig I used for the California
> QSO party was new and had a Collins 500Hz "virtual" roofing filter. During
> the contest some stations could copy me but I could not copy them due to
> the
> pumping generated by adjacent signals. 
A 70Mhz 1st i.f. with a 20Khz filter just ain't gonna cut it in a tight cw
contest, even if you creatively name the 2nd i.f. filters.  

73,
Barry N1EU

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