| Type | HEMT, cooled |
|---|---|
| Channels | 2 |
| Receiver Noise Temperature | 4 K |
| Frequency Range | 7.95 - 9.15 GHz |
| Bandwidth RF-Filters | 7.95 - 9.15 GHz |
| Polarization | LHC and RHC |
| Calibration | Noise Diode Noise Balance: yes Phase Cal for VLBI: yes |
| Feed | Secondary Focus Feed |
| 1. IF | 2.2 - 3.2 GHz |
| 1. Oscillator | ULO1 (x4) or LO (ca. 5.9 GHz) |
| 2. IF (VLBI) | a. 100 - 500 MHz (MK III) b. 0.5 - 1 GHz (VLBA) |
| 2. IF (Spectroscopy) | 100 - 200 MHz |
| 2. Oscillator | ULO2 (x3) 2.1 GHz |
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| - to enlarge, click into block diagram - |
The 8.6 GHz system is a secondary focus receiver with cooled HEMT amplifiers and a cooled polarization transducer. The system is set up for receiving both bands of circular polarization. Since the calibration signal is injected through the directional coupler directly following the horn, it is linearly polarized. The feed is fed through the inner part of the 2.3 GHz offset paraboloid feed system to form a S/X-band receiver for VLBI observations.
The system is constructed mainly for VLBI and spectroscopy observations, it is prepared for broadband polarization work.