SGP/MMCR/C1 - TWTA Faulting

The MMCR transmitter (TWTA) has been having a low helix current fault.  This results in 
the transmitter shutting down.  However, the radar continues to collect data.  The MMCR 
restarts the TWTA at 0000 each day, hence the 2359 end times for many of these intervals.

• Peak tranmitted power, averaged over the course of the hour(PeakTransmittedPowerAvg)
• Receiver Gain(RxGain)
• Range Corrected Calibrated Power(RangeCorrectedPower)
• Receiver 290K Level(Rx290KLevel)
• Number of Gate Heights(NumHeights)
• Mean Noise Level(NoiseLevel)
• radar mode char identifier(ModeDescription)
• Receiver Cal Time Stamp(RxCalTimeStamp)
• base time(base_time)
• MMCR Spectral Width(SpectralWidth)
• Pulse Width(PulseWidth)
• Number of Code Bits(NumCodeBits)
• Power (uncalibrated)(Power)
• RadarWaveLength(m) / [4 * InterPulsePeriod(s) * NumCoherentIntegrations](NyquistVelocity)
• Circular Depolarization Ratio(CircularDepolarizationRatio)
• Receiver Mode(ReceiverMode)
• Signal to Noise Ratio(SignalToNoiseRatio)
• Time offset of tweaks from base_time(time_offset)
• Array of heights for each power(heights)
• TWT Status Code, details forthcoming from MMCR vendor(TWTStatusCode)
• Current Receiver Number(ReceiverNumber)
• Number of Coherent Integrations(NumCoherentIntegrations)
• Time associated with hourly averaged values(TimeAvg)
• Dummy altitude for Zeb(alt)
• Receiver Cal Check Level(CalCheckLevel)
• Average Noise Level (S/N<0)(AvgNoiseLevel)
• Delay to First Range Gate(StartGateDelay)
• Number of Points in FFT(NumFFT)
• Receiver Cal Check Time Stamp(CalCheckTime)
• MMCR Mean Doppler Velocity(MeanDopplerVelocity)
• Inter-Pulse Period(InterPulsePeriod)
• DC Filtering ON-OFF Status(DCFilterONOFF)
• Windowing ON-OFF Status(WindowingONOFF)
• Number of Receiver(NumReceivers)
• Receiver Sky Noise(SkyNoiseLevel)
• lat(lat)
• Minimum detectable reflectivity(MinimumDetectableReflectivity)
• Gate Spacing(GateSpacing)
• Operating Set for this Record(ModeNum)
• MMCR Reflectivity(Reflectivity)
• Data Quality Status(DataQualityStatus)
• Number of Spectral Averages(NumSpectralAverages)
• Max. height of clutter removal(ClutterHeight)
• time(time)
• lon(lon)
• Radar Constant(RadarConstant)

• Raw data stream - documentation not supported(raw)

• Elevation(Elevation)
• Receiver Gain(RxGain)
• Delay to First Range Gate(StartGateDelay)
• Number of Coherent Integrations(NumCoherentIntegrations)
• Power (uncalibrated)(Power)
• Operating Set for this Record(ModeNum)
• Time offset of tweaks from base_time(time_offset)
• Receiver Sky Noise(SkyNoiseLevel)
• Range Corrected Calibrated Power(RangeCorrectedPower)
• lat(lat)
• Inter-Pulse Period(InterPulsePeriod)
• Height of Center of Each Range Bin(Heights)
• Data Quality Status(DataQualityStatus)
• lon(lon)
• Max. height of clutter removal(ClutterHeight)
• Azimuth(Azimuth)
• Receiver Cal Check Level(CalCheckLevel)
• radar mode char identifier(ModeDescription)
• Number of Gate Heights(NumHeights)
• Receiver Cal Time Stamp(RxCalTimeStamp)
• DC Filtering ON-OFF Status(DCFilterONOFF)
• Receiver Mode(ReceiverMode)
• Number of Receiver(NumReceivers)
• RadarWaveLength(m) / [4 * InterPulsePeriod(s) * NumCoherentIntegrations](NyquistVelocity)
• Current Receiver Number(ReceiverNumber)
• MMCR Spectral Width(SpectralWidth)
• Windowing ON-OFF Status(WindowingONOFF)
• Dummy altitude for Zeb(alt)
• Circular Depolarization Ratio(CircularDepolarizationRatio)
• MMCR Mean Doppler Velocity(MeanDopplerVelocity)
• Number of Points in FFT(NumFFT)
• Minimum detectable reflectivity(MinimumDetectableReflectivity)
• Spectral Data(Spectra)
• MMCR Reflectivity(Reflectivity)
• base time(base_time)
• Receiver 290K Level(Rx290KLevel)
• Number of Code Bits(NumCodeBits)
• Pulse Width(PulseWidth)
• Gate Spacing(GateSpacing)
• Radar Constant(RadarConstant)
• Signal to Noise Ratio(SignalToNoiseRatio)
• Mean Noise Level(NoiseLevel)
• First Order Estimate of Spectral Count Calibration(CalibrationConstant)
• Receiver Cal Check Time Stamp(CalCheckTime)
• Number of Spectral Averages(NumSpectralAverages)
• Average Noise Level (S/N<0)(AvgNoiseLevel)

SGP/RL/C1 - Invalid liquid water channel data

On 20060906, the liquid water channel (LWC) was disabled due to the removal of its 
photomultiplier tube (PMT).  Consequently, the signals recorded for the LWC contain either zero 
or pure noise after that date.

Also, starting on 20070522, the LWC was populated with data from the T2 channel as a 
result of a slight reconfiguration of the data acquisition system.

On 4 March 2008 The LW channel photomultiplier tube was reinstalled in the Raman lidar. 
Effective 0000 UTC on 5 March 2008 the LW channel began producing valid liquid water data 
once again.

• Number of photons counted in the liquid water channel(liquid_counts_high)
• Summed analog signal in the liquid water channel(liquid_analog_high)