[Elecraft] filters

[john at kk9a.com]

So I guess you're saying that there is not much difference, only 55Hz, so
maybe it is not worth the cost of having both. My K3S's are programmed to
switch these roofing filters in closer to their actual passband. The cost of
the 250Hz filter is a small percentage of the transceiver cost so I do not
mind having this option.  I see it being far more useful than the 1.0Khz
filter.  WD8Z said that he ordered the 400Hz by mistake and my initial
comment was that it is a fantastic CW/RTTY filter. I have two in each of my
K3S's.

John KK9A


-----Original Message-----
From: ed at w0yk.com [mailto:ed at w0yk.com] 
Sent: Sunday, December 31, 2017 10:58 PM
To: john at kk9a.com
Cc: 'Elecraft Reflector'
Subject: RE: [Elecraft] filters

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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