Beta 2.31/DSP 1.89 CW Increments vs. DSP shift increments

[ni0c]

Thanks to Elecraft for the 10 Hz CW pitch increments.  
I'm a little confused though, since the shift increments
are still 50 Hz.  For example, when I set the pitch to
380 Hz, the asterisked shift frequency is 0.35 Khz.
When I set the pitch to 340 Hz, the asterisked shift
frequency is 0.30 KHz.  It seems to me there is a
problem with rounding here.

73,
Chuck  NI0C
K3 s/n 1061
 
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[Vic K2VCO]

ni0c wrote:
> Thanks to Elecraft for the 10 Hz CW pitch increments.  
> I'm a little confused though, since the shift increments
> are still 50 Hz.  For example, when I set the pitch to
> 380 Hz, the asterisked shift frequency is 0.35 Khz.
> When I set the pitch to 340 Hz, the asterisked shift
> frequency is 0.30 KHz.  It seems to me there is a
> problem with rounding here.

The center frequency that is displayed is rounded down to the 50 Hz.
value below it. But the actual center frequency of the filter matches
the pitch so that received signals at the chosen frequency will be peaked.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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[ni0c]

K2VCO wrote:

" The center frequency that is displayed is rounded down to the 50 Hz.
 value below it. But the actual center frequency of the filter matches
 the pitch so that received signals at the chosen frequency will be peaked."


I read on page 30 of the Rev. D1 manual that as the PITCH control is
adjusted, "the peak in response of all crystal filters will track the
sidetone
pitch; no filter adjustments are needed."  However, I'm wondering if the
DSP filters also track in the same way, given that the SHIFT function
now has a coarser reolution than the PITCH.

With regard to the "rounding," of the SHIFT display, it seems that a
largest integer, or "floor" function was used to generate the display.
This is truncation, not rounding.

73,
Chuck  NI0C
K3 s/n 1061





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