RATAN-600 Radiometer = 3.9 cm
Technical information:
Central frequency
7.7 GHz
Bandwidth
1.0 GHz
Bandpass Filter
7.2 - 8.2 GHz
Front end amplifier
ξεντ
Physical temperature
15 K
System noise temperature
62 K
Realized sensitivity ( = 1 s )
3 mK
Design
Switching Radiometer
Operating modes
Double - beam switching
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 - latching circulator switch,
  • 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, A2 - noise power control attenuators,
  • LFA - low frequency amplifier.