Joe: I listended with a Heil ProSet last night... I will check the impedance, dont know it offhand.
True, a mismatch would add to the effect. -lu- ----- Original Message Follows ----- From: "Joe Subich, W4TV" <li...@subich.com> To: "'Lu Romero - W4LT'" <lrom...@ij.net>, <elecraft@mailman.qth.net> Subject: RE: [Elecraft] [K3] K3 NR Date: Wed, 26 Aug 2009 22:19:23 -0400 >> 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: elecraft-boun...@mailman.qth.net >> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Lu >> Romero - W4LT >> Sent: Wednesday, August 26, 2009 10:09 PM >> To: elecraft@mailman.qth.net >> 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:Elecraft@mailman.qth.net >> > >> > 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: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
