On Tue, Feb 2, 2010 at 9:19 AM, Brian Lloyd <brian-wb6...@lloyd.com> wrote:
I should have read the entire thread. Yes, most of the problems occur when doing sample-rate conversion. VAC seems to be the worst with PowerSDR being right behind. The sample-rate conversion used by fldigi and dm780 seem to be pretty good. So: 1. start PowerSDR. 2. set VAC sample rate to 48,000 Hz. 3. enable VAC. 4. start fldigi or dm780. This has worked just fine for me. This approach means there will be two sample rate conversions: from the internal sample rate of the radio (48kHz, 96kHz, 192kHz) to 48kHz going to VAC, which takes place in PowerSDR, and then again in the digital mode program. My experiment where I changed the sample rate between PowerSDR and VAC to match the internal sample rate of the CODEC being used, i.e. either 8kHz or 11.05 kHz, turned out to be substantially worse, leading me to believe that the sample-rate conversion code being used by PowerSDR is not as good as that in fldigi or dm780. YMMV. -- 73 de Brian, WB6RQN/J79BPL _______________________________________________ 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://kc.flex-radio.com/ Homepage: http://www.flex-radio.com/
