TVEGAS_44 - Continued tests with the simulator

Setup

  • Using the new USB-controlled attenuator; range 0 - 30dB attenuation
  • running procs from /users/rprestag/bankProblem/simulate3
  • use modified setDigitalGain to control the attenuator
  • noise source set to 10dB, ampifier, one 10dB pad. Attenuator set to 16dB gives -20dBm ADC power
  • bof is ver 121. Doesn't seem to be operating as expected. For -20dBm input power:
lbw_gain lbw_gain, filtersnap
2**28  268435456     -25
2**29  536870912    - 19
2**30  1073741824   -13

  • So, one power of 2 gives 6dB extra power, as expected, but unity gain is not at 2**24. Set to 2**29 for now. Close enough
  • run USB attenuator from 4 to 30 dB in steps of 2
  • run checkLinearityBalance
  • scan 1; attenuator didn't get set... Can't figure out; do it by hand.
  • start with scan 20...32
  • stop for the day.

-- RichardPrestage - 2015-02-17
Topic revision: r1 - 2015-02-17, RichardPrestage
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