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1.6 GHz / 18 cm Spectroscopy with the 26m telescope

Table 1. 1.6 GHz / 18 cm Receiver characteristics. PSS for each sense of polarized radiation
Receiver type dual cryogenic HEMTs
Polarization LCP+RCP
RF filters unfiltered / 1612 / 1666 / 1720 MHz
Zenith System Temperature 39 K
Point Source Sensitivity 5.1 Jy/K/Pol
System Equivalent Flux Density 430 Jy
Half Power Beamwidth 0.494 degrees

Table 2. Lines observable at 1.6 GHz
Spectral Line Rest Frequency (MHz)
hydroxyl 1720.52998
hydroxyl 1667.35903
hydroxyl 1665.40184
hydroxyl 1612.23101
H156alpha 1715.673
H157alpha 1683.200

Table 3. Velocity range, spectral resolution with 1024 channels, and minimum rms noise after 1 minute integration, for the given correlator bandwidth, for each sense of polarized radiation, at 1665 MHz.
Correlator Velocity Correlator RMS Noise RMS Noise
Bandwidth Range Resolution in 1 min in 1 min
MHz km/s km/s K Jy
32.000 5765.8 5.631 0.032 0.16
16.000 2882.9 2.815 0.045 0.23
8.000 1441.4 1.408 0.063 0.33
4.000 720.7 0.704 0.089 0.46
2.000 360.4 0.352 0.126 0.65
1.000 180.2 0.176 0.179 0.92
0.500 90.1 0.088 0.253 1.30
0.250 45.0 0.044 0.357 1.84
0.125 22.5 0.022 0.505 2.60