On Jul 20, 2008, at 6:24 PM, Tim Ellison wrote: > "Well, that will be tough because I am only using the devices on the > MB itself. There are no boards plugged into any of the PCI slots." > > AH HA! I am sure the mobo Firewire interface is your problem.
Perhaps. > There have been several glitching related issues that were resolved > by *not* using the mobo Firewire interface. It usually shares too > many other resources with other mobo embedded devices. > > I had to go to an external Firewire ExpressCard for my laptop > because it would not work well at any sampling rate other than 48K. > Now I can run at 96 or 128 K dropout free. You do understand that the dropouts are on the VAC link to MixW, not between PowerSDR and the '5K. I am having no problems with FireWire comm to the '5K itself. Even with VAC and MixW running PowerSDR does not show any bad behavior and the analog line-out signal to my Mac is error-free. > Also, only run VAC at 48K (not to be confused with the audio > sampling rate). I am running the VAC link at 12Ksps. > You may need to tune you VAC channel parameters too, particularly > the ms/int values. Varying ms/int over the range of 5-15 didn't seem to have any effect either way. > The following KB article can be very helpful in setting up MixW and > VAC. > HOWTO: How to Setup Virtual Audio Cable (VAC) 4.0x with PowerSDR > (http://kb.flex-radio.com/article.aspx?id=10218) > > One other thing. In MixW, configure the audio processing method to > DirectX. Interesting. If anything the dropout rate is higher when I do that but it is something else to try. Still, no luck. Thank you for the ideas. > > > > -Tim > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > ] On Behalf Of Brian Lloyd > Sent: Sunday, July 20, 2008 7:59 PM > To: Neal Campbell > Cc: flexradio@flex-radio.biz > Subject: Re: [Flexradio] Dropouts in VAC stream (was: differences > betweenPSK31 demodulators) > > > On Jul 20, 2008, at 3:08 PM, Neal Campbell wrote: > >> Hi guys! >> >> Brian, what model of Athlon X2 are you using? How much memory and >> what >> video card (sri if I missed this in a prior note)!. > > AMD Athlon 64 X2 Dual Core 3800+, 2.01GHz, 1GB RAM. NVIDIA GeForce > 6150 on the MB. > >> The very first thing to do is go to >> http://www.tweakhound.com/xp/xptweaks/supertweaks2.htm and follow his >> XP tweaking advice. When it gets to the part about turning off >> Windows >> services, I would turn off the services listed in "Level 2" and if >> you >> run into problems, make the services settings look like Level 1. > > OK, did that. Set up for level-3. Pretty agressive. No change (as I > have mentioned). > >> Anything that requires you open Regedit, ignore. > > Sensible. > >> Second thing is to make sure your 1394a adapter isn't sharing an IRQ >> (interrupt) with any other bandwidth hogs like the USB controllers, >> the lan controllers or the video adapater. To do this go to the >> System >> control panel, select hardware manager and once its open, go to the >> view menu item and click on "by connection". This will sort the list >> of devices by interrupt. Find your video card and see what else is >> sharing it. If one of the bandwidth hogs I mentioned are sharing with >> it, try moving it (or some of the other devices) to different slots. >> On my machine, it wants to share the IRQ with the Ultra Audio Adapter >> so I just disabled it in the device manager. > > Well, that will be tough because I am only using the devices on the MB > itself. There are no boards plugged into any of the PCI slots. > >> One other thing (while you have the device manager open), make sure >> that the machine isn't trying to run TCP over the firewire port (its >> default for some reason). Disable the 1394 Network Connection (don't >> worry, it doesn't disable your firewire controller). > > Already done. I always disable that right off the bat on any system I > am running. > >> I have a computer with a X2-4800 and 2GB of memory and have run mixw >> with the Flex-recommended values in VAC, at 96 Khz/1024 defined in >> the >> driver spec and 2048 in the DSP buffer size. I would start at that >> and >> if you see gaps in the waterfall (after doing the optimizations in >> tweakhound) try 4096 in the DSP buffer. > > Already up to 2048 in the Flex-5000 control panel. DSP buffer size was > already 4096. > >> The reason this can't be a "recipe" for everyone is that everyone's >> set their operating system differently, has their 1394a card sharing >> its IRQ with different devices, etc. Windows machines are "the wild >> west" when it comes to performance tuning (not even sure its an art). >> >> >> Let me know how this goes! > > It didn't, at least not for MixW. Now it is time to try other programs > to see if that has any effect. > > > -- > > 73 de Brian, WB6RQN > Brian Lloyd - brian HYPHEN wb6rqn AT lloyd DOT com > > > > > _______________________________________________ > FlexRadio Systems Mailing List > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > Knowledge Base: http://kb.flex-radio.com/ Homepage: > http://www.flex-radio.com/ > > -- 73 de Brian, WB6RQN Brian Lloyd - brian HYPHEN wb6rqn AT lloyd DOT com _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/
