The IF system was setup to observe four spectral windows with the spectrometer. Each spectral window was 800 MHz wide with center frequencies of 9900, 9875, 9925 and 9950 MHz. The first two spectral windows had their IF signals go down Optical Drivers 2 and 3 and then proceed through Converter Modules 1, 2, 5, and 6. The second two spectral windows had their IF signals go down Optical Drivers 6 and 8 and then proceed through Converter Modules 11, 12, 15, and 16.