You apparently are changing the filter width with the WIDTH control - which moves both the high and low end of the filter width, so it cuts out a good part of the lows in the SSB received signal. To get those lows back, you must use the SHIFT.
To make things easier, switch to the LO-CUT-HI selection and reduce the width using only the HI - cut knob. You will not have to adjust anything else to make the voice recognizable and intelligible because the lows in the voice are retained. Further explanation - when you change the width from 2.8 to 2.1, you reduce the width by 700 Hz, and that is 350 Hz from both the high end and the low end. If you started with an audio passband of 200 Hz to 3000 Hz, the resulting passband after the width reduction is 550 Hz to 2450 Hz - that is too much reduction of the lows to be intelligible, so you have to shift downward by 350 Hz to make it intelligible again, and with a passband from 200 Hz to 2300 Hz. 73, Don W3FPR On 4/14/2011 2:44 PM, kcflyers wrote: > My K3 has 2.8 and 2.1 8 pole filters in both main and sub receivers. Set up > for zero offset per manual. When I switch to 2.1 filter, I need to use the > Shift control to make receive audio sound approx normal. Perhaps 3/4 khz > shift. Is this normal? When using the 2.8 filters, no shift is needed. > > ______________________________________________________________ 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
