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: [email protected] [mailto:[email protected]] Sent: Sunday, December 31, 2017 10:58 PM To: [email protected] 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: [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]
