| 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 Phase Cal for VLBI: yes |
| Feed | Secondary Focus Feed |
| 1. IF | 2.2 - 3.2 GHz |
| 1. Oscillator | ULO1 (x3) or LO (ca. 5.9 GHz/ 5.646 GHz) |
| 2. IF | a. 0 - 1 GHz (VLBI,
Spectroscopy) b. 0.5 - 1 GHz (VLBA) |
| 2. Oscillator | ULO2 (x4) 2.2 GHz/ 2.204 GHz |
| |
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 circular polarizations. 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 receiver is extended to 1.1 GHz instantaneous bandwidth in the VLBI
IF. To use the full bandwidth the LOs
have to set to the following values:
| ULO1 = 941 MHz (x6 = 5.646 MHz) |
| ULO2 = 551 MHz (x4 = 2.204 MHz) |