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12.2 GHz / 2.5 cm Spectroscopy with the 26m telescope

Table 1. 12.2 GHz / 2.5 cm Receiver characteristics.
Receiver type dual uncooled HEMTs
Polarization LCP + RCP
RF filter 12048-12216 MHz
Zenith System temperature 100 K
Point Source Sensitivity 5.8 Jy/K/Pol
System Equivalent Flux Density 1200 Jy
Half Power Beamwidth 0.066 degrees

Table 2. Lines observable at 12.2 GHz
Spectral Line Rest Frequency (MHz)
20-3-1 E-methanol12178.593
H81alpha12148.666

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 12178 MHz.
Correlator Velocity Correlator RMS Noise RMS Noise
Bandwidth Range Resolution in 1 min in 1 min
MHz km/s km/s K Jy
32.000 788.3 0.770 0.090 0.54
16.000 394.1 0.385 0.128 0.77
8.000 197.1 0.192 0.180 1.08
4.000 98.5 0.096 0.255 1.53
2.000 49.3 0.048 0.361 2.16
1.000 24.6 0.024 0.510 3.06
0.500 12.3 0.012 0.722 4.33
0.250 6.2 0.006 1.020 6.12
0.125 3.1 0.003 1.443 8.65