Not sure as I don't have a schematic... Somewhere I wrote down the amp that was used.... I'm sure that we could ask for it I just hadn't gotten around to it. It is an active filter though...
~Brett On Sat, 2009-07-04 at 17:35 -0400, Gregg W6IZT wrote: > What are the values of the components for filter? > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Mike Scott > Sent: Saturday, July 04, 2009 1:21 PM > To: [email protected] > Subject: Re: [Elecraft] K3 Audio Low Pass Filter > > >G'day, > >What about - how did it perform? > >...does it in any way respond to the "pink" vs. "white" noise thread of a > few weeks ago. > >Mike VP8NO > > Mike, > I am still evaluating but I believe the LP filter took the harshness out of > my audio. I had been one of people with a complaint about harsh audio and so > far I like it. I seem to have distortion products above the intended audio > passband that this filter cuts out. That extra stuff made it fatiguing for > me; other people don't hear it. I understand that some people can be > fatigued by odd order harmonic distortion even when the distortion is way > down. > > I am not set up to compare with another radio and I can't do an A-B test as > the filter is hardwired in. I plan to live with this set up for a while and > maybe put in larger coupling caps to bring up the audio warmth. Perhaps I > will replace with 100 uF SMD devices like the current production caps. > > The filter is a 4th order Chebyshev low pass filter with a -6dB shoulder > somewhere around 4.5 KHz judging by looking at a plot. It is flat below 3.2 > KHz and low ripple, so, nothing to do with pink noise. Maybe Wayne will get > around to putting a pink noise filter into the DSP. > > I am experimenting with the following Rx EQ settings from another post to > simulate a pink noise filter: > 1 +0 > 2 +8 > 3 +2 > 4 -1 > 5 -1 > 6 -3 > 7 -5 > 8 -10 > > > > Mike Scott - AE6WA > Tarzana, CA (DM04 / near LA) > NAQCC 3535 > K3-100 #508 / KX1 #1311 > > > > > > ______________________________________________________________ > 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 ______________________________________________________________ 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
