Technical information:
| Central frequency |
21.65 GHz |
| Bandwidth |
2.5 GHz |
| Bandpass Filter |
20.4 - 22.9 GHz |
| Front end amplifier |
НЕМТ |
| Physical temperature |
15 К |
| System noise temperature |
77 К |
Realized sensitivity
(  = 1 s ) |
3.5 mК |
| Design |
Switching Radiometer |
| Operating modes |
Double - beam switching
or Single - beam mode with
a cooled reference |
| Polarization |
No |
| Feed Horn |
Quasi Scalar |
| Calibration |
Noise generator |
Simplified block-diagram of the radiometer
- PF1, PF2 - input feed horns,
- DC1, DC2 - directional couplers,
- S1, S2 - latching circulator switches,
- CI - cooled ferrite isolator,
- 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- noise power control attenuator,
- LFA - low frequency amplifier.
Interior of the 15 K cryostat:
Cooled front-end of the 1.4 cm radiometer:
|
= 1.4 cm