DQRID : D080331.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
01/01/2007000003/15/20072300Suspect
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Subject:
NSA/MWRP/C1 - V-band Noise diode unstable
DataStreams:nsamwrpC1.b1
Description:
Sometimes between Jan and March 2007 the V-band noise diode started to be unstable. V-band 
channels during this period show large discrepancies with model computations. The 
problem was evident during the month of January. During February and March the problem was less 
visible, however measurement model comparisons show an increased bias. The instrument 
was calibrated with LN2 on March 15 and the calibration results showed a large drift in the 
calibration parameters.  The hardware failure will have consequences in the retrievals 
of temperature and relative humidity profiles. 

It is difficult to establish when the failure started. Disregard the V-band channels 
during this period. Vertical profiles of temperature and humidity are affected as well. Please 
note that this DQR only covers the 7 channels (brightness temperatures) in the V-band 
range (51 to 60 GHz). The 5 K-band channels (20-31 GHz) are not affected.
Suggestions: 
Measurements:nsamwrpC1.b1:
  • relativeHumidity
  • waterVaporMixingRatio
  • virtualTemperature
  • brightnessTemperature
  • dewpointTemperature
  • waterVaporDensity
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