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Type | HEMT cooled | |||
Channels | 4 | |||
Receiver Noise | 9K | |||
Frequency range | 4.6 - 5.1 GHz | |||
Polarization | LHC/RHC | 2 horns | ||
Calibration | Noise diode | phase cal for VLBI | ||
Polarimeter | 2 Broadband Polarimeters | |||
1st IF | 2360 - 2860 MHz | |||
LO1 | Valon 5009 | fsynt.1 = 3.73 GHz x 2 (LO1 = 7.46 GHz) | ||
2nd IF | 0.5 - 1 GHz | |||
LO2 | Valon 5009 | fsynt.2 = 2.2 GHz |
Simplified Block Diagram of the receiver, (RK on 24.4.2018)
Detailed Block Diagram of the complete receiver, (ZK on 18.5.2018)
This is a 4 channel system with cooled HEMT preamplifiers. It has been constructed for sensitive Continuum, VLBI and Pulsar observations. It is permanently installed in the secondary focus cabin. The frontend has 2 identical dewars, each comprising one horn, a cooled directional coupler, circular (RHC and LHC) transducer and 2 HEMT amplifiers etc.
The Broadband Polarimeters are placed at the frontend, because the system has a 1 GHz bandwidth.