At any given time, only one frequency band can be observed, but with the two polarizations available. Each polarization delivers a 4 GHz bandwidth (from IF=4 to 8GHz). The two 4GHz bandwidths coincide in the sky frequency scale.
The wide-band correlator WideX gives access to the two 4GHz wide IF bands simultaneously. WideX provides a fixed spectral resolution of about 2MHz over a 3.6GHz bandwidth (the slightly reduced bandwidth is due to the combination of filters used in the IF procesor). WideX is available in parallel to the narrow-band correlator (see below).