Sam, You have half of the battle won. You identified the issue.
Now for the resolution. This is what worked for me running MixW. 1.) Update VAC to 4.07. There are several fixes that help the buffer problem you are experiencing. You should be able to get this from the place you purchased VAC from originally. 2.) The KB article on how to setup VAC (along with MixW) in the KB was updated several weeks back to a configuration that is more stable. That is by setting the VAC sample rate @ 48 KHz and the MixW sample rate at something much lower, like 12 KHz. I recommend using that as a guide for configuring your system. http://kb.flex-radio.com/article.aspx?id=10218 3.) You may need to increase the VAC buffers. I use the same buffer size for both the audio and VAC buffers (in the PowerSDR setup). In my case, 1024 -Tim ---- -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Samuel Cartinhour Sent: Wednesday, August 22, 2007 6:38 PM To: flexradio@flex-radio.biz Subject: Re: [Flexradio] Power fluctuation when using PSK31 I'd like to thank everyone who has responded so far to my original message. I did a more thorough search through the archives and found additional postings that seem to describe the same, or a similar behavior with VAC and MixW (for example, search on "pulsing"). Jim (W4ATK) suggested I try sending a stream of semicolons to get a better reading on fwd power. I tried this and see a max power of around 25 watts. There are still fluctuations down to the single digits during this test. Tim Ellison asked me to try monitoring my output directly on the MixW waterfall to check for horizontal lines and listen for drop outs. When I do this, I definitely see horizontal lines that correspond to brief audio pops. There are also slightly longer dropouts during which the signal on the waterfall actually disappears (i.e., there is a thin black line across my signal). During these moments, fwd power is zero. A few other data points: I am using version 4.04 of VAC. The VAC buffer is set to 512. The VAC sample rate is 11025. I am identifying as a TS-2000. As I mentioned before, I am using an Edirol FA-66. The sound card buffer size is 1024 and the sample rate is 192000. The computer is a Dell Dimension E520. "System properties" shows a Dell Dimension DM061, Pentium D CPU 2.80 GHz, 1.00 GB RAM. With version 1.10.1 of PowerSDR, I rarely see CPU% go over 20%. PowerSDR is set to "normal" priority. Changing this setting to "high" has no effect on the problem. Finally, Larry (Wo0Z) has also seen this behavior with MixW but has not noticed any effect on his ability to make PSK31 contacts. If there are other tests I should run, or if I should try different settings, please let me know. I will post the results here. Sam W2SNX _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
