A revised version of the System Design Description document is
available on ALMAEDM at

/IPTs /SystemEngineering /Documentation .

This is rev C, document 80.04.00.00-002-C, dated 2004-01-30.

The main changes from the previous version include re-wording of the
discussion of WVRs in sections 3.1.1.2 and 3.3.4, and slight changes
to the phase stability requirements in Table 4B as a result of using
the latest estimates of phase switching residuals (LAMA memo 803) and
of WVR residuals.  (The instrumental jitter limit becomes 75 fsec rather
than 83 fsec, and the drift limit becomes 25 fsec rather than 28
fsec.  These changes are too small to be of practical significance,
but they allow us to maintain consistency and traceability.)

In addition, some minor wording improvements have been inserted and a
few typos have been corrected.

The (draft) "System-Level Technical Requirements" document has also
been revised to be consistent with the above.  It is now rev B, and is
in the same folder on ALMAEDM as document 80.04.00.00-004-B.

--Larry