Thanks for the suggestion. I changed the PSDR VAC sampling rate from 48K to 8K, and found that the CPU usage by my 5000 dropped by several (about 8 or 10) points. Most interesting, the CPU usage when I open DM780 through VAC to PSDR no longer spikes by 20+ points. If I recall, Tim said something about improvements or changes in the down conversion routines for audio sampling rates. Can anyone else confirm an improvement in CPU usage when the PSDR VAC sample rate is set to 8k? In other words, is the experimenter influencing his perceived results? Jim KJ2P
> From: [email protected] > To: [email protected] > Date: Mon, 6 Sep 2010 23:11:08 -0500 > Subject: Re: [FlexEdge] Flex 5000a--Sudden drop in noise floor--loss of > sensitivity > > > Ralph maybe a buffer or VAC audio setting and Jordan maybe a resource or > antenna switching issue, may take several exchanges to figure what is > happening with both.. So let's take these off the reflector and handle > directly, no need to take up the reflector bandwidth.. > > > Hello Dudley, > > I'll make one last general post about this as it may affect some other folks > as well. > > After a couple of hours of trying things one step at a time and writing > everything down, I found that the problem seems to be the related to the > sampling rate set in PSDR when using VAC. > > Although the manual for PSDR 1.18.6 says to use 44,000 for the best results > with the least chance of audio dropouts, I found exactly the opposite to be > true in my case. > > Running with either WinPSKse or WinWarbler with VAC, the only way I can > eliminate the dropouts is to use a sample rate of 8000. That works > perfectly. As the sample rate increases, so does the frequency of the > dropouts. I also noticed that I saw the dropouts when I had just VAC > enabled, even with all PSK software shut down. > > YMMV. > > 73, > > Ralph W5JGV - WD2XSH/7 > > > _______________________________________________ > Flexedge mailing list > [email protected] > http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz > This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used > for posting topics related to SDR software development and experimentalist > who are using beta versions of the software. _______________________________________________ Flexedge mailing list [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for posting topics related to SDR software development and experimentalist who are using beta versions of the software.
