ALMA Memo # 483

The ALMA 1st Local Oscillator Reference

Bill Shillue, Sarmad AlBanna, and Larry D'Addario
National Radio Astronomy Observatory

2004-09-29

The ALMA 1st LO Reference system consists of a laser synthesizer, active line length correction, photonic distribution, and a photonic receiver. The phase stability and phase drift specifications are very ambitious, and the effort to meet them has led to small evolutions and improvements in the design. This memo gives a general description of the system, and documents its current measured performance levels, as measured in the laboratory.

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