[Elecraft] filters

[john at kk9a.com]

400Hz is definitely my favorite CW and RTTY filter. I also use the 250Hz
roofing filter (switched in at 350Hz) when the QRM gets bad, what document
shows that this offers little improvement? 

John KK9A


K9MA wrote:

Assuming it's for a K3(s), I don't think you will find the 250 Hz filter 
very useful.  The response that both Elecraft and I measured shows that 
the narrow filter really isn't much better.  Were I to do it again, I 
would only use the 400 Hz ones.

73,
Scott  K9MA

On 12/31/2017 17:02, doug dietz wrote:
> Guys
> i ordered a 400hz filter by mistake.  I have use for a 200h or 1k, 18.k
>   What ya got
> doug49707 at gmail.com  Doug WD8Z