>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
