Thank you all for your input. It's always nice to come into work on a
Monday and be able to hit the ground running! I loaded Jack's latest
tutorial 3 bof file and I got some interesting results. The spectrum
slips along the x axis 4 channels every 800ms or so. This slipping
event is also accompanied by about 10db of noise in the stop band of the
signal. Please see the following plots:
ftp://ftp.cv.nrao.edu/NRAO-staff/jcastro/CASPER/Spectrometer/Tutorial_3_sliding_spectrum1.PNG
ftp://ftp.cv.nrao.edu/NRAO-staff/jcastro/CASPER/Spectrometer/Tutorial_3_sliding_spectrum2.PNG
I'll dive into this and try to figure out what's going on, but extra
eyes are appreciated.
Thanks,
Jason Castro
NRAO
On 9/17/2012 8:03 AM, Jason Manley wrote:
On 17 Sep 2012, at 11:45, Jack Hickish wrote:
2^27 isn't a valid sync period for tut3, which has an FFT ending in a 10th
order reorder (https://casper.berkeley.edu/memos/sync_memo_v1.pdf).
Good catch! This is what I get for copy-pasting that design from another :-/
Tut3 has been in use in CASPER for over 3 years now and I think you're the
first one to notice!
Jason
