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TGBT14A_912_11 - VEGASDM jump tests
Try and isolate cause of VEGAS DM jumps, and Bank H balancing problems
Try mode 11, this failed to balance VEGAS before. Take out data acquisition step.
Fails to balance. Steve investigates CM16 is dead - this explains the problem.
NB - don't seem to get drop-outs when scan is not running...
- this should show drop-outs. Run an archivist sampler on Bank A - can't find any!
- spike is present in both sampler and VEVGASDM. So, it is not a VEGASDM problem.
Try running with Bank A looking at the noise source
- Bank A noise source - still see -ve going spikes
Try and get an archivist running - edit
Scan 3 - Bank A now looking at astronomical signal again. Still get a spike. Is it present in the data?
Try and run mode 1 with highest possible data rate, and see whether we still get spikes.
With Doppler Tracking turned on; can only go as fast at 0.2 secs; try this.
_archivist - still shows drop-outs.
Turn off Doppler tracking, and put integration time to 0.1 secs. Add archivists on all Banks
_archivist (all 8 banks). No drop-outs. Must be related to Doppler tracking?
Turn Doppler tracking back on again; 0.2 sec integration times
_archivist - dropouts (Bank B, Bank A, Bank D, Bank B, Bank C).
Go back to the noise source in all banks
_archivist - dropouts (Bank G - one pol, again, Bank F +ve, Bank D, Bank F)
_archivist - dropouts (Bank E, Bank D)
Switch back to Mode 10 where we seemed to get more dropouts.
tp_nocal, 0.1s integrations
Scan 9 -
_archivist by mistake
Scan 10 -
_archivist - aborts
Scan 10 - aborts again - why? - continue the scan - seems ok? - LO1? No data is taken, but no dropouts.
archivist in _TP mode_
aborts again - what is going on here? LO1 is screwed up
archivist in _TP mode_
Turn Doppler tracking back on again; 0.2 sec integration times - Mode 1
External Noise source in both Pols of Bank A
Drop-outs Bank F, C, B, G, E, D, H - seems quite convincing. Switch to Mode 10, which has more dropouts
_archivist - Dropouts B,C,D,E,F,G,H - no A
I'm convinced. Stop here
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Topic revision: r2 - 2015-01-27,
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