Might this result from the satellites coming in/out of view and the
GPSDO switching among them? Maybe try it without the GPSDO.
I am surprised you are within 100 microHz on your measurement - my
5000a synthesizer seems to _always_ be 20 -60mHz off.
Jerry W4UK
At 10:40 AM 12/17/2011, Bill Dailey wrote:
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
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