| Type | HEMT, cooled |
|---|---|
| Channels | 2 |
| Receiver Noise Temperature | about 26K (frequency dependent) |
| Frequency Range | 1.29 - 1.72 GHz |
| Bandwidth RF-Filters (fixed) | 1.2 - 1.8 GHz |
| Bandwidth RF-Filters (selectable) | 1.29 - 1.36 GHz 1.35 - 1.48 GHz 1.59 - 1.725 GHz 1.345 - 1.435 GHz |
| Polarization | LHC and RHC |
| Calibration | Noise Diode VTO: yes |
| Phaseshifter | in ULO-system |
| Feed | MPIfR Prime Focus Horn |
| 1. IF | 90 - 210 MHz |
| 1. Oscillator | ULO1 or LO 1.2 - 1.8 GHz |
The 1.3-1.7 GHz system is a prime focus receiver with cooled HEMT amplifiers. The system is built to observe circular polarization, the transducer comprises a cooled linear transducer (design NRAO) followed by a cooled hybrid. To suppress strong radio transmitter signals above 1450 MHz the filter at 1.345 to 1.435 GHz is recommended for sensitive continuum measurements.