S-Band receiver

The S-band receiver has one beam with dual polarizations. The feed has a cooled OMT producing linear polarizations. You can select circular polarization synthesized using a hybrid (after the first amplifiers) in the front-end. Internal switching modes include frequency switching. You can select one of two RF filters:

• 1.68-2.65 GHz, or

• 2.1-2.4 GHz.

There is choice between two noise diodes with different levels (~10% or ~100% of the system temperature) for flux calibration.

A superconducting notch filter is permanently installed immediately after the first amplifiers and covers the range 2.3-2.36 GHz. This filter suppresses interference from the Sirius and XM satellite radio transmissions.