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The CSU-CHILL Site primarily hosts the CSU-CHILL S-band weather radar, along with other guest instruments. CSU also operates another S-band weather radar at the Pawnee site.


CSU-CHILL is a transportable dual-polarization radar system, with a 9 meter parabolic reflector antenna. The radar features dual Klystron transmitters driving each polarization channel, each developing approximately 1 MW of power. The transmitters are controlled by a flexible digital waveform generator, which can synthesize a wide variety of polarization states. The low-noise receivers are attached to a customized signal processing system, which can output various polarimetric moments. Moment data, as well as raw time series data can be archived for later study. The facility is connected to the CSU network through a high bandwidth microwave link, which provides up to 30 MBps data rate.

The radar site is located near Greeley, CO at latitude 40° 26' 46.5'' (N40.44625) and longitude 104° 38' 13.5'' (W104.63708), at an elevation of 1432 meters MSL.

CHILL Antenna
CHILL Radome and Airlock

The antenna is housed within an inflatable radome, for protection against wind loading and corrsion. The radome is constructed from low-loss microwave-transparent materials. The main radar hardware is housed within the radar trailer, which contains the transmitters, receivers and control subsystems. The digitized signals from the receiver are passed through fiber-optic cables to the operations trailer, which contains the Parallel Receiver signal processor and display workstations.

CHILL Operations Trailer, Exterior View
Interior View, CHILL Operations Trailer

Technical Documentation

Technical details of the CHILL radar is described in the technical brochure. A more detailed description of the hardware and software architecture of CHILL is given in the hardware description.


The CSU-Pawnee Doppler radar is a single-polarization radar sysem, with a Klystron transmitter. It is located 48 km NNW of the CSU-CHILL radar. The radar system is used in a dual-doppler configuration along with CSU-CHILL, and can perform synchronized scans.

CSU-Pawnee Radar

The radar transmitter frequency is 2.730 GHz, and uses a vertically polarized antenna with a 1.6° beamwidth. The signal processor used is the CHILL Parallel Receiver. The transmitter can generate an output power of 425 kW. The radar is located at latitude 40° 52.269' (N 40.87115) and longitude 104° 42.84' (W 104.714) , at an altitude of 1688 m MSL.

Some example cases of dual-doppler data collected with the CHILL-Pawnee dual-doppler network are presented in the Featured Analysis page.

Guest Instrumentation

The CSU-CHILL site is also host to guest instrumentation from other organizations.

NCAR Weather Station