> I prefer the sound of the 3.25 version for ssb, its cleaner > and somewhat less bright (flatter in response). I had to > tweak the RX EQ to add some bass in the 3.27 version or it > sounds "harsh" in my headsets (I dont use speakers hardly > ever, btw).
What is the impedance of your headphones? With anything less than 100 Ohms or so, the stock 10 uF headphone coupling caps cause a significant LF roll off - particularly with 8 Ohm cans. 73, ... Joe, W4TV > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Lu > Romero - W4LT > Sent: Wednesday, August 26, 2009 10:09 PM > To: [email protected] > Subject: Re: [Elecraft] [K3] K3 NR > > > > Lyle: > > Just played with the NR in both SSB and CW, on 80 and 40. > > First, I can hear the change of the filters now without > turning things on and off, as you mentioned it would work. > The frequency response is decidedly less "flat" (less bassy) > than the sound of 3.25. For CW, the 3 and 4 settings are > much more efficient, not so in SSB, where the 1 and 2 > settings are much cleaner sounding and better copy. I found > that with no antenna and with the RF gain turned to 12 > o'clock... Turn on the NR and all receiver white noise mutes > and slowly ramps up. That's a recursive effect, I guess. > > I prefer the sound of the 3.25 version for ssb, its cleaner > and somewhat less bright (flatter in response). I had to > tweak the RX EQ to add some bass in the 3.27 version or it > sounds "harsh" in my headsets (I dont use speakers hardly > ever, btw). Inteligibility is marginally better with 3.27 on > ssb and quite a bit better on CW, so you have drifted a bit > to the CW side of the equation, but with a decent compromise for SSB. > > No more boingy peakyness in any mode, which is good, and the > level while it still drops a bit, is better behaved. > > Can I assume from some comments I have read here that the NR > process is pre > EQ and AGC? How exactly do the processes "stack" in the > radio architecture? > > If NR is at the top of the stack, a decent "fix" might be to > somehow gang these three processes using presets so that they > can be set up ahead of time and recalled from a memory button > by the user. > > As an old brodcaster, we used to preset things in Switchers > (vision mixers to UK readers) using a process called E-MEM... > Which could recall preset parameters in "salvos" to preset > multiple settings. This might work here. > > This would be handy in a contest environment where a minimum > of tweaking and rapid adaptation to changing conditions is > needed... You could play outside of a contest and create the > settings then in the heat of battle, recall them with a > single button push from a "canned" setup. It wouldnt be > perfect for any environment, but it might mean the difference > between working a mult and not working a mult. And > multipliers, after all, are.... :) > > As you said, every receiving environment is different, but > some generalizations can be made and being able to recall the > multiple settings would be a definite plus feature of the radio. > > Thanks for letting us test these iterations. > > Lu Romero - W4LT > K3 # 3192 > > > Lyle Johnson wrote: > > > >> ...For now I'll treat the parameter as an opaque > >> series of magic numbers. > > > > The way the new beta NR works is: > > > > Fx-y > > > > x selects the length of the filter. > > > > F1 = 121 taps, F2 = 91 taps, F3 = 61 taps, F4 = 31 taps > > > > (The Beta 3.25 release used FIR filters of 61 taps.) > > > > y selects values of Beta (gain), decay, and delay (how long the NR > > algorithm waits to process a signal) > > > > (The Beta 3.5 release used the "x" parameter for these selections) > > > > 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 > > > > > > -- > View this message in context: > http://n2.nabble.com/K3-NR-tp3515659p3520809.html > Sent from the [K3] mailing list archive at Nabble.com. > ______________________________________________________________ > 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
