[Elecraft] filters

[ed at w0yk.com]

The actual passband of these two filters is more important than the
marketing name.  The "400 Hz" filter is about 435 Hz wide at the -6dB
points.  The "250 Hz" filter is about 380 Hz wide.  Look at the graphs on
the Elecraft website.

Ed W0YK

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of john at kk9a.com
Sent: Sunday, December 31, 2017 7:32 PM
To: 'Elecraft Reflector' <elecraft at mailman.qth.net>
Subject: [Elecraft] filters

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

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