[asac] [almanews] ALMA Memo 335 Released
Stacy Oliver
soliver at tuc.nrao.edu
Wed Jul 11 13:09:47 EDT 2001
ALMA Memo #335
Phase Drift Measurements of YIG-Tuned Oscillator Sources for the ALMA LO
Dorsey L. Thacker, Eric W. Bryerton, Richard Bradley, and Kamaljeet Saini
29 June 2001
In this memo, we present measured phase drift data of a YIG-tuned oscillator
(YTO) multiplied to mmwave frequencies, a prototype of the baseline ALMA LO
source. The test setup and analysis algorithms are described. We also
discuss phase drift added by mmwave multipliers and power amplifiers, with
the conclusion that their contribution is insignificant. Various components
and system concepts are analyzed with respect to their contribution to the
phase drift of the array. As phase drift at the level required for ALMA is
unique and not well understood, much of the discussion will be of a tutorial
nature.
View a PDF version of ALMA Memo #335.
http://www.alma.nrao.edu/memos/html-memos/alma335/memo335.pdf
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