[hpsdr] HPSDR CW ops please comment

[Graham / KE9H]

Ken:

I am an infrequent CW operator with HPSDR, and others may comment,
but I would like to point out that several settings in PowerSDR have a 
noticeable effect
on latency (audio processing time delay), and you generally want to 
reduce the latency  for
fast CW operations.

For low latency in PowerSDR, you want to use smaller DSP buffer sizes,
smaller Audio Buffer sizes, and higher Sampling rates.  This also has an 
effect on the
steepness of the filter skirts, and you may want to make some compromise 
adjustments
to get to your personal optimum operating point with PowerSDR.

For a given Sampling Rate, if you set the Buffer size too small, you 
will hear the
your computer "choking" on the data transfer, and will need to go back 
to a larger
Audio Buffer size.

I suggest you refer to pages 8 and 9 in the Mercury manual, and Appendix 
"A" of the
FlexRadio Systems Model 5000 manual for additional insight.

Audio Buffer Size:
PowerSDR Setup/Audio/Primary

Sampling Rate:
PowerSDR Setup/Audio/Primary

DSP Buffer Size:
PowerSDR Setup/DSP/Options


--- Graham / KE9H

==


Ken N9VV wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Dear fellow CW ops, can you please comment on the T/R or QSK 
> capabilities of the OpenHPSDR board suite. I searched the archive and 
> I don't see anyone operating CW with their OpenHPSDR.
>
> How is the CW performance using PowerSDR?
>
> How is the CW performance using K.I.S.S.?
>
> thanks in advance for your kind reply,
> dit dit
> de Ken N9VV
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