The answer to so-called K3 "ringing" at 50 Hz is called 100 Hz. Aggressive skirts are what allows me to hear what I want to instead of what is just a little off my frequency. You're not going to get me to say "yea, rah" for any lessening of aggressive skirts.
As best as I can tell, the softening of CW signals using IIR at 50 Hz is due to normal keying artifacts being peeled off by the skirts. Yea, rah to that. While it's peeling off the artifacts that make CW sound sharp, it's more so peeling off the interference just a little bit farther away and significantly increasing my wanted to unwanted signal ratio. ** Please tell me you are not going to throw that away because someone wants their received CW to sound "broad" even though their selectivity is set to extreme sharp. ** I would characterize the FIR as 70 and 115 Hz, and the mild increase in "sharpness" of a CW signal as simply allowing just a bit more of the make-break artifacts getting through due to what amounts to increased bandwidth by the choice of shape at the top. I can make *real* ringing on an old RX with too high a Q in the analog crystal filter circuit. The kind that takes entire dit lengths to decay. Those who think the K3 is ringing have obviously never heard that or it would never occur to them to call hearing only 50 Hz of background as ringing. Ringing is basically an analog issue unless the digital processing unwittingly duplicates it. I use the K3's 50 Hz IIR all the time and I don't think it rings. If you think that the audio from the 50 Hz width sounds "pinched" then everything is working, including your ears. 50 Hz is the DEFINITION of pinched bandwidth. Some folks do better at deciphering CW with wider bandwidth. That is not a receiver issue, just a particular ham's personal arrangement of brain cells. 73, Guy. On Sat, Aug 8, 2009 at 8:24 PM, Lyle Johnson <[email protected]> wrote: > The K3 offers IIR and FIR filters for the narrowest bandwidths (100 Hz > and 50 Hz). > > IIR may have some amount ringing. The disable IIR, go to CONFIG:FLx ON > (or any other filter menu) and tap "7" on the keypad until you see IIR OFF. > > The K3 uses fairly aggressive skirts on its filters. We have talked > about implementing a "soft slope" which would make heavily filtered > noise a bit broader, but that has implications on dynamic range and > other issues that keep it from getting near the top of the list. > > 73, > > Lyle KK7P > > ______________________________________________________________ > 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 > -- 73, Guy K2AV ______________________________________________________________ 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
