I am 60 years old and what fatigue me more is to listen more than half an hour any SSB with less than 2.4 Kz specially If the roll-off is been set over 300Hz,what I like the most on my K3 is precisely the wide audio bandwith from 50 to 4000Hz that I have now after the newest FW 3.42 and with the hardware modified DSP board,its de
"For a refined ham it is compulsory to own a k3" --- On Fri, 10/16/09, Paul Christensen <w...@arrl.net> wrote: From: Paul Christensen <w...@arrl.net> Subject: Re: [Elecraft] [K3] K3 Rev C DSP with Low Freq Enhancement To: m...@paxsen.com, Elecraft@mailman.qth.net Date: Friday, October 16, 2009, 12:18 PM > Juan, I think your 3rd harmonic measurement is the key. If you research > audio fatigue you may find that odd harmonics are particularly troublesome > and that they can cause audio fatigue even when the level is below what > you > might consider audible. Mike, There may be several variables occurring here. When I get back from a conference, I plan on making my own FFT measurements at the H/P jack regarding this effect. It's possible that the intensity of distortion artifacts as measured by Jack Smith, and presumably what you're hearing, may be different among K3 samples. Myself, I don't hear anything that brings about fatigue under any operating conditions. Also, Rx audio response capabilities with the latest K3 firmware has evolved and additional low-end content is present that was not there in previous releases. And so, one has to consider whether it was the change in firmware -- or the beta LPF board that is now responsible for the changes you're now hearing. I have to believe that with some ops, the perception of fatigue is related to a previous lack of low-end to presence-band balance. More than anything, what brings fatigue to me is extended listening through a narrow audio passband. Paul, W9AC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
