12 Meter Receiver T_sys Measurements

Below are links to the actual files recorded at the telescope each time a calibration is taken. This files contain most information an observer needs to gauge the performance of the receiver.

Be advised the the T_sys for any one channel may vary due to many factors such as tau0, telescope elevation and the sky frequency being too close to a water line. It is also possible the receiver is being tuned too close to the edge of a receiver band and that too can result in higher then normal T_sys.

These tables are presented for comparison purposes only. You mileage may vary...

Record Fields:

 Date   scan# UT   Az    El   Sky_freq  Tau0  Opr Obs  Rx  T_sys1 T_sys2 T_atm

29Oct20   28 11:04 298.2 55.0 88.637619 0.148 jwd hmb 3mmlo 257   248   1.8
29Oct20   29 11:08 298.1 54.3 88.637619 0.148 jwd hmb 3mmlo 258   249   1.8
29Oct20   30 11:12 298.1 53.5 88.637619 0.137 jwd hmb 3mmlo 257   248   1.8
29Oct20   31 11:20 283.0 56.9 88.630467 0.106 jwd hmb 3mmlo 267   252   1.9

Note: Tau0 is the measurement from the 225 GHz Radiometer. The T_atm, in degrees C, is from the weather station.

Observing Season 04-05

NOTE: During parts of the 2004-2005 season the 225 GHz radiometer was out of commission so the tau0 field may sometimes contain bogus information.

Also, the date fields contain a formatting error in that the first 2 digits of the year are printed instead of the last 2.  So 29Oct20 should read 29Oct04. This problem has been corrected for all future tables.

• 3mmlo
• 3mmhi
• 2mmsis