I could be wrong... I'll have to take a closer look... Or I guess I could just take some audio measurements of the headphones port.
~Brett On Fri, 2009-07-03 at 21:37 -0400, Joe Subich, W4TV wrote: > > Its installed in the speaker outputs. > > That's a shame, It should be in the common feed to both > the headphone and speaker amplifiers. > > > I should take a look and see if the headphone > > output had that 11-12khz stuff on it... > > Yes, it's coming out of the DSP DAC ... it's present on all > three (headphone, speaker and line) outputs. > > 73, > > ... Joe, W4TV > > > > > -----Original Message----- > > From: [email protected] > > [mailto:[email protected]] On Behalf Of Brett Howard > > Sent: Friday, July 03, 2009 9:08 PM > > To: Bob Cunnings > > Cc: Elecraft > > Subject: Re: [Elecraft] K3 Audio Low Pass Filter > > > > > > Its installed in the speaker outputs. So it doesn't modify > > the headphone circuits but I use it via speaker at home most > > of the time... I should take a look and see if the headphone > > output had that 11-12khz stuff on it... > > > > ~Brett > > > > On Fri, 2009-07-03 at 18:21 -0600, Bob Cunnings wrote: > > > What is the point of insertion (in terms of the schematic) for this > > > filter? > > > > > > Bob NW8L > > > > > > On Fri, Jul 3, 2009 at 6:09 PM, Brett > > Howard<[email protected]> > > > wrote: > > > > Its a low pass filter starting around 3.8Khz or so. I have some > > > > before and after plots. I just need to get around to > > posting them > > > > so I can put them up on the reflector. > > > > > > > > On Fri, 2009-07-03 at 19:45 -0400, Mike Harris wrote: > > > >> G'day, > > > >> > > > >> | All in all I'm quite pleased with the sound difference. > > > >> | > > > >> | ~Brett > > > >> > > > >> OK, that's couple of positive comments. Is there any technical > > > >> data on the characteristics of this filter. For > > example, does it > > > >> in any way respond to the "pink" vs. "white" noise > > thread of a few > > > >> weeks ago. > > > >> > > > >> I've become rather more interested in this since > > reactivating my K2 > > > >> and running it side by side with the K3. The K2 sounds so much > > > >> nicer even in the presence of a received S3 buzzy > > background noise. > > > >> If only the K2 power overshoot on 40M SSB didn't give my > > amp a hard > > > >> time... > > > >> > > > >> Now to put this in context, there was a huge improvement > > in the K2 > > > >> as soon as I installed the analogue af CW filter years > > ago. In SSB > > > >> mode the filter just introduces a low pass filter which > > takes the > > > >> hiss out of the audio and made it really smooth to listen to. > > > >> > > > >> I have played with the DSP bandwidth settings and > > replicated the K2 > > > >> af spectrum as displayed in Spectrogram to see if I can > > make them > > > >> sound the same but they don't. > > > >> > > > >> My agc and equalizer settings are nothing unusual or extreme. > > > >> > > > >> Regards, > > > >> > > > >> Mike VP8NO > > > >> K2 #1400 > > > >> K3 #345 > > > ______________________________________________________________ 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
