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: http://www.arcetri.astro.it/science/Radio/alma/digfilt2.html
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The main characteristics of the instrument are:
The instrument has been tested using water masers in Orion (left) and W49 (right).
References:
The hardware is quite flexible. It is composed of a stack of different modules (ADC; processing; electric interface to the recorder) and systems with different complexity can be obtained adding more modules.
The Arcetri group has acquired a DBBC in a minimal configuration, and has started a study to explore the possibility to use it as a general purpose backend.
A general framework logic has been studied for the processing module (CORE1), based on a Xilinx Virtex2 FPGA. It includes the interface to the high speed data busses, clock distribution and a general purpose programmable interface to the control computer. This structure will be ported to the new Virtex4 board (CORE2).
A porting of the FFT spectrometer described above is in progress.
A FFT architecture to split the input band into 16 32MHz channels has begun, using the experience gained with the ALMA correlator.
References: