I recommend the 1KHz over the 400Hz filter (if you're going to get one filter) b/c without it you get a lot more IMD when you set the DSP width anywhere above 400Hz. In a contest during a run I like to set the DSP bandwidth to 600-800Hz. If someone is closer than 300-400Hz +- from my frequency, I want to know about it since not all contest participants are using K3s and I don't think it's safe to assume that all would-be calling stations will be able to copy me if the station 350Hz away is very loud and I'm not.
Since the output of the roofing filter is the input to the DSP, the DSP is able to do a much better job at 500Hz if you have the 1KHz roofing filter installed than if you just have a 2.x KHz filter installed. Ideally you'd have one narrow roofing filter as well, but unless you anticipate doing most of your operating with the width set to less than or equal to 400Hz, I think your overall experience will be better with the 1KHz roofing filter + DSP. On Thu, Dec 15, 2011 at 10:02 AM, Dave Hachadorian <[email protected]> wrote: > I like the 250, which is actually 370. I told the K3 it was 400, > so the filter is switched in at DSP BW 400. It works great on CW > and is perfect for RTTY. > > The 400 is another good choice. It is actually 435, so there's > not much difference between 370 and 435. > > > Dave Hachadorian, K6LL > Yuma, AZ > > > > -----Original Message----- > From: [email protected] > Sent: Thursday, December 15, 2011 9:17 AM > To: [email protected] > Subject: [Elecraft] K3 Cw Filter Choices > > Good Morning, when I initially purchased the K3 I only had SSB > filters put into the radio. Which is currently the 2.7 and 1.8. > Would like to get back into CW and I was wondering which CW > filter would be good for that purpose. Any help would be much > appreciated. Thanks!! Mark KB3Z > > ------------------------------ > Sent using Verizon.net Mobile > ______________________________________________________________ > 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 > > ______________________________________________________________ > 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 > ______________________________________________________________ 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
