Re: [Flexradio] Dropouts in VAC stream (was: differences between PSK31 demodulators)
On Jul 20, 2008, at 8:04 AM, Jerry Flanders wrote: > At 12:32 AM 7/20/2008, Brian Lloyd wrote: >> >> >> Huh. And no-one said anything about the spurs and varying noise level >> either. > > What spurs are you seeing? > > More details on the varying noise level? See my original posting of about 48 hours ago. Basically my 5K always shows these little spurs that are 10dB-15dB above the noise floor that wander about opposite the tuning direction. Some frequencies when selected end up with a broad-spectrum increase in noise floor. The window for this behavior is a couple hundred Hz wide. Things get worse as I go up in frequency. There are LOTs of them on 6M. (Hmm, DDS cruft above the Nyquist frequency aliased back into the passband?) > > > Jerry W4UK > -- 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/
Re: [Flexradio] Dropouts in VAC stream (was: differences between PSK31 demodulators)
Over a year ago, many of us sent contributions to someone for a new replacement VAC type program. What ever happened to that new VAC type program? Are there other options to VAC, other than real cables? But I do have VAC 4.08 working fine with programs other than MixW. Just can't seem to get MixW to not have the audio pops. However, DM 780 ,WSJT, MMTTY, and others are fine with VAC. John, N3WT -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Jerry Flanders Sent: Sunday, July 20, 2008 11:05 AM To: Brian Lloyd; flexradio@flex-radio.biz Reflector Subject: Re: [Flexradio] Dropouts in VAC stream (was: differences between PSK31 demodulators) At 12:32 AM 7/20/2008, Brian Lloyd wrote: > > >Huh. And no-one said anything about the spurs and varying noise level >either. What spurs are you seeing? More details on the varying noise level? Jerry W4UK ___ 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/ ___ 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/
Re: [Flexradio] Dropouts in VAC stream (was: differences between PSK31 demodulators)
At 12:32 AM 7/20/2008, Brian Lloyd wrote: > > >Huh. And no-one said anything about the spurs and varying noise level >either. What spurs are you seeing? More details on the varying noise level? Jerry W4UK ___ 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/
[Flexradio] Dropouts in VAC stream (was: differences between PSK31 demodulators)
Turns out the quality problem decoding/displaying PSK31, where Cocoamodem on the Mac connected via analog was copying much better than MixW connected via VAC, is caused by dropouts in the audio stream. The dropouts are cyclic. Audio is good for about 20 seconds then it stutters for about 5 seconds. The process repeats ad infinitum. CPU utilization is down around 20%. I am using an AMD Athlon 64x2 duo-core processor running at 2GHz with 1GB RAM. This machine *should* be fast enough to run both PowerSDR and MixW concurrently. (It seems so with CPU utilization at 20%.) Huh. And no-one said anything about the spurs and varying noise level either. -- 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/
