Hello Brett!
Is there no way to put dsp at/as the first filter?
What are the limitations of the dsp, frequency, filter quality?
Is there a problem getting dsp to work at say 455 khz?
To answer these questions would take a textbook! Or at least a very
long essay.
The short version is: there are many ways to design a radio, and to
partition the analog and digital circuitry. We chose a design
architecture that provides world-class performance at a realistic cost.
What would be the result of a real good variable filter
at the 8.215 Mhz IF just after the mixer and NO dsp
for filtering? (K2?)
It would be a K2 without the KDSP2 :-)
The 2nd IF of 15 khz is audio, is it not?
The use of a final IF in the 12 kHz to 40 kHz range is used by virtually
every manufacturer of DSP-equipped radios. There are solid technical
and economic reasons for this.
73,
Lyle KK7P
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