Test all incoherent LBW modes in cal, search, and fold
Get fluxcal data in all LBW modes
Do on-sky tests of all spectral line FS modes to compare with data from TGBT17B_501
Details
Session begins at 04:45. Joe is switching to the LBW branch.
Switch over took a while, but scheduling block submitted at 05:24
i0100x0512
Bandpass looks good
No cal signal seen in cal scan.
Still seeing some additional smearing and off-pulse noise
i0100x1024
Bandpass levels are a bit low but acceptable. Could safely increase by a factor of 2.0
No issues in cal scan
Pulsar looks good at first glance in fold mode
Search mode seems to have a frequency shift again. VEGAS input IF is 350 MHz, as it should be. Still not clear what is causing this. There was no frequency shift in the total-intensity scan.
i0100x2048
Levels too high in scan #9. Redoing.
Scan #10 looks better with vegas.scale = 1000. Even that could be lowered a bit.
There is a frequency shift in this mode as well. IF tuning is all correct. Will try to recreate it if time at the end.
i0100x4096
No obvious frequency shift.
i0200x1024
Cal scan ran without issue.
Abort at start of fold-mode scan, but it seemed to come from the antenna manager. This may have been caused by the operator starting and stopping some weather-related programs in Task Master
No issue with subsequent scans
i0200x2048
Forgot to change vegas.conf to use the new BOF file with the fixed 10-GbE core. I also had to modify vegas.conf so that the packet format for this mode was 1SFA, which it appears to be based on packet size.
After making the above changes scans ran fine, but there was a frequency shift in this mode, similar to the i0100x2048 mode.
i0200x4096
Bandpass looks good
Pulsar detected. No apparent frequency shift.
i0200x8192
Bandpass looks good
Pulsar detected. No apparent frequency shift.
Going to try to recreate the frequency shift issues and then run those modes in a loop to see if they persist.
Sequence starting with scan #23
No apparent shift in any of the i0100x1024 scans.
Also no visible shift in any of the i0100x2048 scans.
No visible shift in i0200x2048, either
Could not recreate any frequency shifts
Moving on to fluxcal scans on 3C43
c0100x0064 scans didn't run properly. All others were fine.
Redid c0100x0064 fluxcal scans at end.
Moving on to spectral line checkout scans
First scan in sequence is #65
Oops. Forgot to have the operator retract the boom. Then had some VNC issues. Lost a bit of time.
Good scans start with #74
Also got position-switched data in Modes 1, 3, 4, 7, 10, 19, 20, and 29. Also 2, 5, 6, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 21, 22, 23
Joe began switching back to release branch at 12:45.
Performed checkout scans. All looks good.
Conclusions
LBW modes all seem to check out except for the intermittent frequency shifts in i0100x1024, i0100x2048, and i0200x2048. These can't be reliably reproduced and will still require more investigation.
Ryan will need to modify auto-plotting script to work in LBW modes when not all banks are writing data.
Overall a successful run. Barring any unforeseen issues with the final processing I think we will be ready to release.