1. Performance of the Band 3 (84-116 GHz) receiver for ALMA
Stéphane Claude,
Herzberg Institute of Astrophysics
National Research Council, Victoria, Canada

2. Main Specifications Frequency range is 84-116 GHz
Simultaneous reception of two orthogonal polarizations
Simultaneous reception of two side-bands (2SB mode)
Total IF output bandwidth of 8 GHz per polarization
Superconductor-Isolator-Superconductor (SIS) cryogenic detector and low noise amplifier operating at 4K.

3. Receiver Design

4. Cartridge Feedhorn OMT Pol 1 Pol 0 2SB Mixer assemblies 4 K stage
Amplifiers
80 K stage
300 K Vacuum flange

5. Details of the mixer-hybrid assembly

6. Sideband Separating RF Hybrid Assembly

7. Automated multi-channel Mixer Test Set

8. Test Set CW signal source Calibration system Cryostat
Warm Cartridge Assembly
Local Oscillator
Warm amplification
Mixer and Amplifier Bias module

9. Cartridge #2 Noise - RF Band
4 GHz IF bandwidth Spectroscopic Observation

10. Cartridge Noise – IF Band LO=100 GHz, LSB Pol 0

11. Image Rejection Ratio
IF Band LO=100 GHz,
100 MHz IF bandwidth
RF Band