[Elecraft] filters

[K9FD]

  KFL3C-200    200 Hz

Look at that one instead of the 250hz if your going to put a narrow one in.
I have both and the 200 is more xtals and is better.
73 Merv K9FD
> 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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