INSTRUMENT DESCRIPTION

Microwave radiometer with steerable antenna for measurement of
column amounts of liquid water in clouds, and precipitable water
vapor in the atmosphere.  Antenna was directed to the zenith during
FIRE I.

Operating frequencies:  20.6, 31.65, 90.0 GHz

Spatial resolution:     2.5 deg antenna beamwidth
			(44m @ 1.0 km range)

Temporal resolution:    60 sec

Estimated accuracies
     Liquid water:      +/- 10 percent or better (absolute)
			Noise level +/- .025 mm
     Water vapor:       0.08 cm rms relative to radiosonde
     (Vapor and liquid data retrievals were from 20.6 and 31.65 GHz
      data only)

Radiometer location:  San Nicolas Island, northwestern tip
		      33.27N,  119.58W