- Information for Astronomers
- General Topics*
- Gruppen Seiten*
* Log-in required
* Log-in required
This is an old revision of the document!
Type | HEMT cooled | ||
Channels | 3 | ||
Receiver Noise Temperature | Channel A | Channel B | Channel C |
→ | 85K | 100K | 135K |
Bandwidth RF-Filters | No RF Filter | No RF Filter | No RF Filter |
Polarization | Horn I | Horn I | Horn II |
→ | LHC (Channel A) | RHC (Channel B) | LHC (Channel C) |
Calibration | Noise diode and pulse cal injection in IF | ||
Feed | Primary fokus horns | ||
RF Frequency Range | 84-96 GHz | ||
1. IF Frequency | 19.5 - 22.5 GHz | ||
1. Synthesizer | Holzworth HSM12001 | Frequency = 7875.0 - 9375.0 MHz (f0 = 8156.25 MHz) | |
Local Oscillator 1 | → | LO1=8*(7875.0 - 9375.0) MHz = 63-75 GHZ | |
2. IF Frequency | 2-4GHz | ||
2. Synthesizer | Valon 5009, Synth. 2 | f0=2250 MHz | |
Local Oscillators | → | LO2=8*2250 MHz = 18 GHz | |
3.IF Frequency | 0.5-1.0 GHz | ||
3. Synthesizer | Valon 5009, Synth. 2 | f0=2250 MHz | |
Local Oscillators | → | LO3=2250 MHz |
ULO Frequencies:
fLO1 = (fsky– 21,0 GHz) / 16
fLO2 = 2250MHz
Simplified Block Diagram of 3mm_receiver_modified.pdf the complete receiver, (ZMK on 16.08.2019)
Simplified Block Diagram of3mm_block_diagram_second_version.pdf (RK on 15.08.2019)
Local Frequency Generation for 3mm Receiver using a Valon 5009 Dual Frequency
Valon5009 synthesizer’s Frequency Response Consideration valon5009_frequency_response.pdf
This is a tunable single sideaband superheterodyne system fo line and total power observations. For frequency dependent receiver and calibration temperatures see diagramm below. The Receiver provides two horns for beam switching. The geometric distance of the horns is d = 9,7 mm, the beam seperation at sky is 55 Arcsec.
This system is part of the Primary Focus Multi Frequency Box #1 (PM 1).