[dxatlas] Re: CW Skimmer clicks
- Hi Pete. Thanks for the reply.
Well, I've now used a KK7UQ interface with two different sound cards
(the one on the motherboard and a Delta 44) as well as the Signalink
I've tried lots of combinations and in my set up at least, processor
power / availability / affinity doesn't appear to make any difference
(I even had CW Skimmer running at real time priority for a short
while without any crash but also without any improvment).
The one thing that DOES make it go away is switching from "MME"
This is a real shame - the Windows USB sound driver used by the
Signalink USB doesn't provide "WDM" according to CW Skimmer :-(
So, in other words I only got CW Skimmer to work really smoothly with
the KK7UQ interface and the two sound cards.
I didn't observe any lines in the waterfall or any splitting up of
characters - I'm thinking that perhaps what you experienced is a
slightly different issue.
73 de Graham G3ZOD
Fists #8385 GQRP #11976
--- In firstname.lastname@example.org, Pete Smith <n4zr@...> wrote:
> A couple of things you can try. Experiment with both drivers for
> card - I found MME to be quieter. Also, try resetting the priority
> CW Skimmer processes in Task Manager to high (not real time, it'll
> crash). If that helps, use a free utility called PRIO to reset its
> priority permanently. With a dual-core machine, which I don't
> told you can also set things up so that Skimmer runs alone on one
> CPU, with everything else on the other.
> I think that what is happening is that each of the clicks
> interruption in the data flow to Skimmer, caused by interference
> programs running on the same PC. If you look really hard at the
> you'll see these as faint dark vertical lines running from the top
> bottom of the screen. If you can catch one running across a CW
> will see either a shortening of the code element (if the drop-out
> the beginning or end) or as breaking into two (an N becomes an S,
> example). If you're really quick, you correlate between the
> effects and errors made by the decoder, typically reflecting the
> pattern (N becoming S, in the example above, or A becoming T).
> In my setup, using an SDR-IQ, no sound card, and a 2.66 GHz Celeron
> 2GB of memory, I spent many hours stopping all background processes
> then restarting them one by one (using MSCONFIG). Stopping them
> definitely cleaned up the noise (only Skimmer running), but I was
> able conclusively to figure out which of them cvould be run without
> recurring. Ultimately, fixing the priority at High helped more
- At 04:44 PM 9/26/2008, you wrote:
>I didn't observe any lines in the waterfall or any splitting up ofIt may well be a different source, but Alex told me that the audio crackles
>characters - I'm thinking that perhaps what you experienced is a
>slightly different issue.
mean blocks are being dropped.
Sorry you can't get the right driver for your interface.