[hpsdr] Latency

[Glenn Thomas]

Hi Shel.

Most any version of MS Windows is a poor choice 
for a real time OS. Unfortunately, Windows is the 
lowest common denominator - it's most everywhere, 
rather like crabgrass. Windoze does most of the 
tings an OS should do in a passable manner, but 
excels at none, except possibly supporting the MS 
marketing plan. Going to a Linux distro, 
especially one that has been worked over to 
provide better real time performance would help. 
Some projects, notably IRLP, have done just that.

Perhaps someone on here more knowledgeable than I 
can comment on the design criteria for Sasquatch 
- which I believe is an embedded processor for 
HPSDR. Running an embedded processor with no O/S 
can provide the most "bang for the buck" in terms 
of DSP processing. However, the downside of this 
approach is a tendency to "lock in" whatever 
processor is selected and make adoption of any 
different future whiz-bang processor more difficult.

73 de Glenn wb6w

At 12:24 PM 5/24/2008, CT1IZU wrote:

>----- Original Message ----- From: "Glenn Thomas" <glennt at charter.net>
>To: <hpsdr at lists.hpsdr.org>
>Sent: Saturday, May 24, 2008 1:28 AM
>Subject: Re: [hpsdr] Latency
>Can you point me to a more complete description
>of where the 300ms to 400ms number comes from?
>
>73 de Glenn WB6W
>
>
>Gleenn
>I imagine the reference be the RSGB´s Radio 
>Communication magazine for March this year. More 
>than likely one of the Peter Hart reviews.  If 
>the performance under a PC is as good as you say 
>I wonder why there is the push to a seperate DSP 
>engine. If the desire is a stand alone radio it 
>would make more sense to me to use a Micro ATX 
>board with the smallest Linux distro that supports the objective.
>
>
>Shel CT1IZU


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