Spectrometer (XFFTS)
This spectrometer is a control chassis which accomodate 8 FFTS cards, each with up to 2.5 GHz bandwidth. Each XFFTS-board operates from a single 5 Volt source and dissipates less than 30 Watt, depending on the actual configuration in terms of bandwidth and number of spectral channels. Precise time stamping of the processed spectra is realized by an on-board GPS/IRIG-B time decoder. Furthermore, the 10-layer boards include a programmable ADC clock synthesizer for a wide range of configurations (bandwidth: 0.1 – 2.5 GHz), making the spectrometer flexible for different observation requirements .
The XFFTS-boards include a standard 100 MBit/s Ethernet interface, which simplifies the combination of many boards into an Array-XFFTS, simply by integration of a common buffered Ethernet switch. Up to eight XFFTS-boards can be housed in one XFFTS-crate together with power supplies (4 × 5 Volt / 20 Amperes) and one XFFTS-controller.
The XFFTS-controller manages the synchronization of the XFFTS-boards. It provides a reference clock for the on-board ADC synthesizers or the GPS/IRIG-B timing information. In addition, the XFFTS-controller displays housekeeping information on a four line LCD, like board IP numbers, temperatures of the ADC and FPGA chips as well as the power level of the IF inputs.
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