K5WA <[email protected]> : > > "I read a post a couple of days before I loaded 3.23 saying that the [10 > Hz] passband tuning made "popping" noises at each 10 Hz."
Actually it's NOT a popping noise, it's the KNIFE'S EDGE. This would never have been noticed because with 50 hz shift, the mind cannot connect the before and after sound of the shift. ...but with 10 Hz, and the change not damped by an analog circuit, one can hear the very sharp 8 db drop of a signal due to a 10 Hz change of position on the steep skirt, and for that matter, hear why a lot of us have been yearning after this improvement. Using the "250" 8 pole filter set for 350 in the filter setup, and IF dsp skirts at 350 to synchronize skirts, you get to listen to a 10 Hz change drop a signal 8 db. This is a HUGE advantage for dropping a signal right at the edge of your passband in a contest. Big difference between .57 .58, .59, and .60 as seen in this partial chart on a steady test signal. Shift Dbv .45 0.1 .57 -14.5 .58 -22.4 .59 -30.9 .60 -37.1 (encountering test signal noise) Way to go Wayne! 73, Guy. ______________________________________________________________ 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
