A. R. Thompson [1], D. Bagri [2], B. G. Clark [2], J. E. Carlstrom [3], L. R. D'Addario [4], D. Emerson [5], R. P. Escoffier [1], J. Romney [2], S. Padin [6], R. A. Sramek [2], D. Thornton [7], W. J. Welch [7]
September 11, 1995
Keywords: electronics, correlator, signal transmission, intermediate frequency, IF, local oscillator, LO, bandwidth, digital sampling
The MMA system to be discussed here takes the signals from the front ends and performs all of the processing necessary to produce the visibility data at the output of the correlator. Thus it includes signal conversion to the intermediate frequency, transmission of the IF signals to the correlator location, filtering to obtain the required bandwidths, digital sampling, application of compensating time delays, and correlation. It also includes generation of all of the required local oscillator signals with appropriate phase changes for fringe rotation and phase switching. The antennas and the front ends including the feeds and quasi-optic components are also parts of the receiving system, but are the subjects of two special working groups.
[1] NRAO/CV
[2] NRAO/NM
[3] U. Chicago
[4] NRAO/GB
[5] NRAO/TUC
[6] OVRO
[7] BIMA
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Last modified: 09 December, 1999
kweather@nrao.edu