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

[Alex]

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. 

So the questions go to Bob & Co. I'm the system integration engineer, not the DSP subsystem engineer on this one.  : )

Alex, N3NP

----- Original Message ----
From: Naylor Jonathan <naylorjs at yahoo.com>
To: hpsdr at hpsdr.org
Sent: Monday, June 12, 2006 8:22:49 AM
Subject: Re: [hpsdr] CASMIR design v0.4 plus introducing COPERNICUS!

***** High Performance Software Defined Radio Discussion List *****

> If we're saying 1kHz is too small of a step size, then what's the
> maximum step size we can reasonably handle? 
> 5kHz? 10kHz? 30kHz? If we're going to have the capability within the
> software, let's maximize it.

The simple answer is .... it depends.

What is your sample rate?

What is the bandwidth of your widest filter/mode?

How wide do you want your bandscope to be?

Don't forget your RIT!

Once you can answer all of these then you can make a stab at
calculating  your largest step size. If you're not bothered about FM,
and a +-5 kHz RIT then a 48 kHz sample rate is usable. With a 96 kHz
sample rate you can easily use 10 kHz steps (these are the uwsdr
values), have FM, and a reasonably wide band scope, without getting too
close to either 0 Hz or exceeding the Nyquist limit.

> Alex, N3NP

Jonathan   ON/G4KLX



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