L-Band receiver

This receiver has one beam on the sky, with dual polarizations. The feed has a cooled OMT producting linear polarizations. You can select circular polarization which is synthesized using a hybrid (after the first amplifiers) in the front-end. Allowed internal switching modes are frequency and/or polarization switching. You can select one of four RF filters:

• 1.1-1.8 GHz

• 1.1-1.45 GHz

• 1.3-1.45 GHz

• 1.6-1.75 GHz

A notch filter between 1.2 and 1.34 GHz is available to suppress interference from a nearby Air Surveillance Radar. There is a choice between two noise diodes with different levels (~10% or ~100% of the system temperature) for flux calibration.