[Elecraft] Setting shift for different filters?

[Don Wilhelm]

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
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