[hpsdr] CASMIR design v0.4 plus introducing COPERNICUS!

[Robert McGwier]

Given what we have seen from early reports on Jason,  we can use pretty 
arbitrary steps.  We can probably use 10 kHz steps.  The downside is 
that as you tune the "panadapter" will stay fixed while the receiver 
slides around in it (PowerSDR does that now but not to the extent of 
PowerSDR in softrock mode or wavefile mode or Rocky, etc.).

Again,  the spur reduction steps are determined by phase truncation 
steps required to get to the "good spots" on the accumulator "wheel" in 
a DDS.  For the 99XX family this is tremendously reduced. 

Bob



Lyle Johnson wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>   
>> Since from a hardware perspective any reasonable step size from 1Hz to 300Hz (or greater) is attainable, 
>> the limits are driven by the capability of the DSP library and the rest of the software. 
>>     
>
> The current PowerSDR uses a step of around 3 kHz in spur reduction mode, 
> so a step size on the order of 5 kHz may not be unreasonable.
>
> 73,
>
> Lyle KK7P
>
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