Calibration is by noise injection. This receiver has four beams total, each with dual circular polarization. One pair of beams cover the 18-22.4 GHz band with fixed separation on the sky. Two other beams cover the 22-26.5 GHz frequency range, also with fixed separation on the sky. The feeds are corrugated horns with cooled polarizers producing circular polarizations.
Calibration is by noise injection.
This receiver has four beams with fixed separation, each dual circular polarization operating over 40-52 GHz. The four feeds are oriented in a cross. The internal switching modes are frequency switching and feedhorn beam switching. The IF Bandwidth is 4000 MHz. A tertiary beam chopper is planned for this receiver but will not be available before late 2001.