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:[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
