Dave, A 50 Hz difference will not make a significant difference in the received audio unless you have greater than average ears. You can "preserve the setting using the Norm I and Norm2 settings, but for the most part, I just use the Lo-Cut and Hi-Cut knobs to dial in what is best for the current situation at hand.
73, Don W3FPR On 2/29/2012 9:16 PM, David F. Reed wrote: > Don, > > thanks for the reply. > > 1. when I try using the Lo-Cut, it seems to be confined to 100 Hz > increments, so, 150, 250, 350, but no 200, 300, or 100 available; > is there a way to set that differently? > 2. I can accomplish the same thing either way if I understand what is > going on, but is there a way to preserve the setting? > > Thanks again. > > --Dave W5SV > > > On 2/29/12 7:18 PM, Don Wilhelm wrote: >> Dave, >> >> Yes, the default is 1500 Hz. with a 2.8 kHz filter, that puts the >> low end at 200 Hz and the high end at 2900 Hz. >> >> AND that is why you should be using the Hi-Cut, Lo-Cut on SSB instead >> of Shift and Width. >> >> For good intelligibility, you need to have some content in the 300 Hz >> range, so set the Lo-Cut to 200, 250, or 300 depending on your >> desires and the QRM conditions. Then change only the Hi-Cut to >> reduce the filter width - the width will change, cutting the highs >> and the filter center frequency will be automatically changed leaving >> the low frequency end unchanged. >> >> You will find that you can use a filter as narrow as 1500 Hz and >> still maintain SSB intelligibility (for a male voice, a female voice >> may need a few more highs). Using Width and Shift to accomplish the >> same thing is possible, but requires a lot more "knob fiddling". >> >> 73, >> Don W3FPR >> >> On 2/29/2012 6:38 PM, David F. Reed wrote: >>> I note that as expected, the center frequency of the bandpass of any >>> given filter on SSB seems to be 1.5 KHz, whether its the 6 KHz filter, >>> the 2.7 KHz filter or the 2.1 KHz filter. >>> >>> This seems to work out to be passing from 150 Hz to 2.85 KHz, right? >>> So the 2.1 KHz filter (without using the shift control) passes 450 >>> Hz to >>> 2.55 KHz, right? >>> >>> I note that if I shift the center of the filter down to 1.35 KHz, the >>> voices are more intelligible... >>> >>> When I switch filters and get back to the 2.1 KHz filter, the shift is >>> lost; is there a setting I can use to save that shift setting? >>> >>> Thanks& 73 de W5SV, Dave >>> ______________________________________________________________ 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
