TGBT14A_912_71 - Continued VEGAS bank discrepancy tests

This was all done with the wrong (release) version of the Manager... This will have screwed up the Balancing._


  • Running 121 BOF; Joe switches systems
  • run Archivist
  • run bank_gain_mode4_kfpa - configures E,F,G,H
  • run balance - gets the correct answer for IF, but fails for VEGAS - maybe because of new BOF
  • correct value is around 500000 = 2**19 - quite different from in simulator, presumably because IF passband is flat?
  • set 500000 to all of banks E,F,G,H
  • CM values range from ~ 2 to 13dB, for -20dBm at VEGAS. Run VEGAS target from -34 to -14 - won't always balance.
  • leave lbw_gain fixed
  • run checkLinearityBalance
  • Scans 1 - 11
  • Suddenly there is much more power in the converter module outputs??? But stop here anyway.
  • VEGAS balance wasn't very optimal (some target values were quite off). Run checkLinearityDB by just running the converter rack through its full range of values from 0 - 30dB.
  • All scans after this point have no archivist files. (bug in checkLinearityDB procedure)
  • Scan 12 - forgot to configure
  • Scan 13 = 0dB
  • Scan 14 = 1dB etc
  • Scan 39 = 26dB has a huge peak in power - like someone walked through the beam or something?
  • Mechanics are greasing the turret...
  • Scan 42 has a big swing in power through it...
  • Scan 43 = 30dB
  • Decide that switching will be confusing. At the end of this, run with total power (no switching) Run checkLinearityDB with 3dB steps
  • Scan 44 = 0dB
  • Scan 48 bank E one pol has a divot out of it...
  • Scan 50 is horrible...
  • Scan 54 = 30dB
  • Forgot to re-add Archivist after running configure!

Reversion check

  • Joe reverts the BOF file to regular
  • Run eso558_vegas to make sure everything is working correctly.
  • Scan 55 - all looks ok.

-- RichardPrestage - 2015-02-18
Topic revision: r3 - 2015-02-22, RichardPrestage
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