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Re: SDR-1000 (was FT-847 discontinued?)



Thanks Dave

I understand the part you are referring to
Got a lot to learn .

Joe  K0VTY
==========================
On Thu, 15 Dec 2005 19:20:25 -0800 "Dave G." <dmg@bossig.com> writes:
> Joe,
> 
> I may be looking at this the wrong way (someone will correct 
> me if I'm wrong) but I think the delay is caused by the 
> software processing the FFT transforms, the I and Q 
> quadrature signal processing,  and other parts of the SDR-1K 
> software.
> 
> It takes a number of CPU clock cycles to process each 
> instruction (even when it's all in memory). The more complex 
> the program - the longer to get the result.  Hence the faster 
> the CPU, the less the perceived delay.
> 
> The delay I was considering was the time taken between the 
> system receiving and processing the sending stations CW "KN" 
> and for you to actually hear it... 
> Under contest conditions, with a relatively slow CPU, it is 
> possible that the delay would probably be significant enough 
> for the sending station to decide you might not of heard 
> him...
> 
> You can download the SDR-1000 from their web site PLUS a 
> number of articles on various aspects of Software Defined 
> Radios and signal processing techniques.
> 
> I hope this helps...
> 
> Dave KK7SS
> 
> On 15 Dec 2005 at 20:01, k0vty@juno.com wrote:
> 
> > If I recall correctly :
> > Quantizing any short duration signal to digitize it must be
> > done fast enough to be able to re constitute the signal again
> > Quantizing a CW dit requires high speed sampling . Higher than
> > SSB voice.   
----
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