Technical information:
Central frequency |
2.3 GHz |
Bandwidth |
0.4 GHz |
Band pass Filter |
2.1 - 2.5 GHz |
Front end amplifier |
НЕМТ |
Physical temperature |
305 K |
System noise temperature |
95 K |
Realized sensitivity
( = 1 s ) |
8 mK |
Design |
Noise Added Radiometer |
Operating mode |
Single - beam mode
a cooled reference |
Polarization |
Left Circular Polarization ( LCP )
or Right Circular Polarization ( RCP ) |
Feed |
Three-frequency feed with
matched phase center ( the same for 31 and 49 cm ) |
Calibration |
Noise generator |
Simplified block-diagram of the radiometer
- PF - primary feed,
- DC1, DC2 - directional couplers,
- GM - p-i-n diode gain modulator,
- BPF - band-pass filter,
- D - square law detector,
- NG1 - noise generator for calibration,
- NG2 - balance noise generator,
- A1 - NG2 noise power control attenuator,
- LFA - low frequency amplifier.
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