I don't know who to contact on this so I will put it here and leave it up for grabs. I have been dealing with this and trying to trouble shoot it for a couple of months. Fairly complex setup:
Flex-5000a PowerSDR version 2.2.3 (I havent checked other versions), windows 7, i7 speed demon computer IF offset 0 hz, dds offset 0 Stanford Research DS345 Signal generator Both disciplined to a Jackson Labs Fury GPSDO 10Mhz reference Sending audio via VAC - all sample rates verified to 48khz I am sending audio to fldigi (have verified with spectrum lab also, identical results) Excellent frequency resolution.. right on where I would expect (within about 0.1mhz) ...BUT..... Every 9 minutes there is some odd abberancy that occurs with either powerSDR (probably), the radio or VAC that shifts the measurement by +50 mhz. image of graph: http://img703.imageshack.us/img703/9382/spikesbf.jpg I have tried various buffers and cant seem to affect the timing or the magnitude of the shift. I used to get noise that would surge like this with past powersdr versions so I am virtually certain this is a software issue. Anyone have any suggestions of what may be causing this behavior? Doc KX0O -- Doc Bill Dailey KXØO _______________________________________________ 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.
