NSA/GVR/C1 - Instrument calibration

During the period of time specified, the instrument was undergoing calibration. The 
antenna pointed constantly to a hot load placed on the instrument window. All brightness 
temperatures during this time have temperatures > 300 K.

• Unfiltered 183.3 +/- 3 GHz sky brightness temperature(tbsky3u)
• Physical temperature of thermoelectric cooling plate(temp_thermoelectric_cooling_plate)
• Dummy altitude for Zeb(alt)
• Physical temperature of noise diode(temp_noise_diode)
• Physical temperature of antenna feed horn(temp_antenna_feed_horn)
• 183.3 +/- 1 GHz sky brightness temperature(tbsky1)
• Temperature of the hot absorber at the center(temp_hot2)
• Physical temperature of component plate(temp_component_plate)
• Temperature of external sensor(temp_ext)
• Time offset of tweaks from base_time(time_offset)
• 183.3 +/- 3 GHz sky brightness temperature(tbsky3)
• time(time)
• lon(lon)
• 183.3 +/- 7 GHz sky brightness temperature(tbsky7)
• Unfiltered183.3 +/- 7 GHz sky brightness temperature(tbsky7u)
• 183.3 +/- 14 GHz sky brightness temperature(tbsky14)
• Unfiltered 183.3 +/- 14 GHz sky brightness temperature(tbsky14u)
• Temperature of the warm absorber(temp_warm)
• Unfiltered 183.3 +/- 1 GHz sky brightness temperature(tbsky1u)
• lat(lat)
• base time(base_time)
• Temperature of the hot absorber at the tip(temp_hot1)

• Temperature of the hot absorber at the center(temp_hot2)
• Temperature of the warm absorber(temp_warm)
• type flag (0=noise source, 1=matched, 2=antenna)(type)
• Dummy altitude for Zeb(alt)
• 183.3 +/- 7 GHz matched load signal(ml7)
• Temperature of external sensor(temp_ext)
• 183.3 +/- 7 GHz warm load signal(warm7)
• 183.3 +/- 14 GHz hot load signal(hot14)
• 183.3 +/- 1 GHz sky signal(sky1)
• Time offset of tweaks from base_time(time_offset)
• Physical temperature of component plate(temp_component_plate)
• 183.3 +/- 7 GHz noise source signal(ns7)
• 183.3 +/- 3 GHz matched load signal(ml3)
• 183.3 +/- 3 GHz sky signal(sky3)
• 183.3 +/- 3 GHz hot load signal(hot3)
• Physical temperature of antenna feed horn(temp_antenna_feed_horn)
• Temperature of the hot absorber at the tip(temp_hot1)
• 183.3 +/- 1 GHz matched load signal(ml1)
• 183.3 +/- 14 GHz matched load signal(ml14)
• lat(lat)
• 183.3 +/- 14 GHz noise source signal(ns14)
• 183.3 +/- 3 GHz warm load signal(warm3)
• 183.3 +/- 7 GHz sky signal(sky7)
• 183.3 +/- 14 GHz warm load signal(warm14)
• mirror orientation (0=warm, 1=hot, 2=sky)(pos)
• Physical temperature of noise diode(temp_noise_diode)
• 183.3 +/- 1 GHz hot load signal(hot1)
• lon(lon)
• time(time)
• 183.3 +/- 14 GHz sky signal(sky14)
• base time(base_time)
• 183.3 +/- 3 GHz noise source signal(ns3)
• 183.3 +/- 1 GHz noise source signal(ns1)
• 183.3 +/- 1 GHz warm load signal(warm1)
• 183.3 +/- 7 GHz hot load signal(hot7)
• Physical temperature of thermoelectric cooling plate(temp_thermoelectric_cooling_plate)

NSA/GVR/C1 - Temperature sensor wire broken

The temp_ext temperatures were occasionally spiking to very large values. Comparisons with 
the co-located 2m METTWR suggest the GVR exterior temperatures were not reporting 
correctly.  Site ops found the temperature sensor had a broken wire and repaired it 7/13.

• Temperature of external sensor(temp_ext)

• Temperature of external sensor(temp_ext)

NSA/GVR/C1 - Incorrect auxiliary measurements

Between 6/16 and 6/19 there was a software problem and the auxiliary measurements all were 
reading constant values. The brightness temperature measurements do not appear to be 
affected.
One of the incorrect measurements that may affect the use of the data is the surface 
temperature. This measurement should be disregarded. 

Measurements from a different instrument (such as the MWR) can be used to replace the GVR 
readings.

• Physical temperature of component plate(temp_component_plate)
• Temperature of external sensor(temp_ext)
• Physical temperature of thermoelectric cooling plate(temp_thermoelectric_cooling_plate)
• Temperature of the hot absorber at the tip(temp_hot1)
• Physical temperature of noise diode(temp_noise_diode)
• Temperature of the warm absorber(temp_warm)
• Physical temperature of antenna feed horn(temp_antenna_feed_horn)
• Temperature of the hot absorber at the center(temp_hot2)

• 183.3 +/- 14 GHz warm load signal(warm14)
• Temperature of the hot absorber at the center(temp_hot2)
• 183.3 +/- 3 GHz hot load signal(hot3)
• Temperature of the warm absorber(temp_warm)
• Physical temperature of antenna feed horn(temp_antenna_feed_horn)
• Physical temperature of noise diode(temp_noise_diode)
• 183.3 +/- 1 GHz warm load signal(warm1)
• Temperature of the hot absorber at the tip(temp_hot1)
• 183.3 +/- 7 GHz hot load signal(hot7)
• Temperature of external sensor(temp_ext)
• 183.3 +/- 7 GHz warm load signal(warm7)
• 183.3 +/- 14 GHz hot load signal(hot14)
• Physical temperature of thermoelectric cooling plate(temp_thermoelectric_cooling_plate)
• 183.3 +/- 1 GHz hot load signal(hot1)
• 183.3 +/- 3 GHz warm load signal(warm3)
• Physical temperature of component plate(temp_component_plate)