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Technical Documentation of the 3.6cm Receiver 7.95 - 9.15 GHz (S36mm)

TypeHEMT cooled
Receiver Noise15K
Frequency range7.95 - 9.15 GHz
PolarizationLHC/RHC single horn
CalibrationNoise diode phase cal for VLBI
1st IF2.2 -3.2 GHz Synthesizer 1 =
LO1Valon 5009 fsynt.1 = 4.4 - 6 GHz (preset 5.55 GHz)
2nd IF0 - 1 GHz
LO2Valon 5009 fsynt.2 = 2.2 GHz

Simplified Block Diagram of the complete receiver, (RK on 19.3.2019)


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:

Synth.1 = 5.646 MHz

Synth.2 = 2.204 MHz

Only with these fixed settings the full bandwidth can be accessed (see also block diagram).

electronics/rx/techinfo/documentation_3_6cm_rx.txt · Last modified: 2020/02/11 14:04 by rkeller