NSA/KAZR/C1 - Polarizer rotated

The cross-polarization returns were higher than the co-polarization returns causing a 
positive linear depolarization ration.  This cannot be correct.  Upon further investigation, 
it was suggested that waveguide going to the antenna feed polarizer was possibly rotated 
by 45 degrees resulting in the antenna transmitting circular polarization rather than 
linear polarization.  Rotating the polarizer in June did not correct the problem.

It turns out that there is a polarizer in the antenna feed.  Rotated the OMT by 45 degrees 
and substituted micro-coax cable instead of waveguide.

During the time covered by this DQR, the "co-polarization" variables are circularly 
polarized opposite of the transmitted polarization.  The "cross-polarization" variables are the 
same circular polarization as the transmitted signal.

• signal_to_noise_ratio_xpol
• Mean doppler velocity, copolar(mean_doppler_velocity_copol)
• cal_constant_xpol
• signal_to_noise_ratio_copol
• Spectral width, cross-polar(spectral_width_xpol)
• Reflectivity, cross-polarization(reflectivity_xpol)
• Reflectivity, co-polarization(reflectivity_copol)
• cal_constant_copol
• Spectral width, co-polarization(spectral_width_copol)
• Mean doppler velocity, cross-polar, dealiased(mean_doppler_velocity_xpol)

NSA/KAZR/C1 - PLO Failure

Streaks began showing up in radar data (reflectivity, doppler velocity, spectral width, 
SNR) at semi regular intervals.  Problem was a failed 16.560 GHz Phase Lock Oscillator 
(PLO).  PLO was replaced 20120214.

• signal_to_noise_ratio_xpol
• Mean doppler velocity, copolar(mean_doppler_velocity_copol)
• signal_to_noise_ratio_copol
• Spectral width, cross-polar(spectral_width_xpol)
• Reflectivity, cross-polarization(reflectivity_xpol)
• Reflectivity, co-polarization(reflectivity_copol)
• Spectral width, co-polarization(spectral_width_copol)
• Mean doppler velocity, cross-polar, dealiased(mean_doppler_velocity_xpol)

NSA/KAZR/C1 - Reprocessing Notice (RID 836 )

See below for details of reprocessing that was completed on 20141223. Original DQR 
category: 4 (Red, Incorrect)

-----------------------------------------------------------------------------

The calibration constants for the modes were incorrect.  The coefficients used were

BL: -34.70 dB
GE: -18.69 dB

The correct coefficients are 

BL: -22.21dB
GE: -13.14 dB

• cal_constant_xpol
• Reflectivity, cross-polarization(reflectivity_xpol)
• Reflectivity, co-polarization(reflectivity_copol)
• cal_constant_copol

NSA/KAZR/C1 - Reprocess: Incorrect calibration coefficients

reflectivity between long and short pulse did not agree with each other after analyzing 
data.
Data will be reprocessed.

• Reflectivity, cross-polarization(reflectivity_xpol)
• Reflectivity, co-polarization(reflectivity_copol)

NSA/KAZR/C1 - Shift in Background Reflectivity and Signal-to-Noise Ratio

The KAZR experienced an abrupt shift in the background reflectivity on 12/14/2012, 
followed by a shift in the background Signal-to-Noise Ratio on 12/16/2012.  The background 
levels then revert back to "normal" levels on 3/17/2013.

Cause is currently unknown.

• signal_to_noise_ratio_xpol
• signal_to_noise_ratio_copol
• Reflectivity, cross-polarization(reflectivity_xpol)
• Reflectivity, co-polarization(reflectivity_copol)

NSA/KAZR/C1 - Snow decreasing sensitivity

There was a possible build up of snow on the instrument causing decreased sensitivity in 
the returns.

• signal_to_noise_ratio_xpol
• signal_to_noise_ratio_copol
• Reflectivity, cross-polarization(reflectivity_xpol)
• Reflectivity, co-polarization(reflectivity_copol)

NSA/KAZR/C1 - RDS server power supply failure

System was not operational and no data was collected.

• cold_noise_copol
• North latitude(lat)
• base_time
• signal_to_noise_ratio_copol
• Spectral width, cross-polar(spectral_width_xpol)
• Reflectivity, cross-polarization(reflectivity_xpol)
• time_offset
• hot_noise_xpol
• cal_constant_copol
• rx_noise
• Spectral width, co-polarization(spectral_width_copol)
• hot_noise_copol
• sky_noise_xpol
• Altitude above mean sea level(alt)
• Mean doppler velocity, cross-polar, dealiased(mean_doppler_velocity_xpol)
• signal_to_noise_ratio_xpol
• Mean doppler velocity, copolar(mean_doppler_velocity_copol)
• cal_constant_xpol
• cold_noise_xpol
• time
• Reflectivity, co-polarization(reflectivity_copol)
• sky_noise_copol
• East longitude(lon)
• range

NSA/KAZR/C1 - Missing Data

Server failed to boot and a new power supply was needed.  KAZR was down during this 
period.

• cold_noise_copol
• North latitude(lat)
• base_time
• Spectral width, cross-polar(spectral_width_xpol)
• signal_to_noise_ratio_copol
• Reflectivity, cross-polarization(reflectivity_xpol)
• time_offset
• hot_noise_xpol
• cal_constant_copol
• rx_noise
• Spectral width, co-polarization(spectral_width_copol)
• hot_noise_copol
• sky_noise_xpol
• Altitude above mean sea level(alt)
• Mean doppler velocity, cross-polar, dealiased(mean_doppler_velocity_xpol)
• signal_to_noise_ratio_xpol
• Mean doppler velocity, copolar(mean_doppler_velocity_copol)
• cal_constant_xpol
• cold_noise_xpol
• time
• Reflectivity, co-polarization(reflectivity_copol)
• sky_noise_copol
• East longitude(lon)
• range