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: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Sunday, December 31, 2017 7:32 PM To: 'Elecraft Reflector' <[email protected]> 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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
