Mma Memo No. 265 Cost-beneet Analysis of Alma Conngurations

ALMA Memo No. 335 Phase Drift Measurements of YIG-Tuned Oscillator Sources for the ALMA LO

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...

ALMA Memo No. 324 Proposal for ALMA Front End Optics

MM-VLBI with ALMA

This memo reviews the requirements for using the ALMA array as a part of a global VLBI array at millimeter wavelengths. ALMA can be outfitted for VLBI at modest cost and should be planned with this capability in mind, as it may be more difficult to retrofit at a later date. The essential features required in the ALMA design are discussed.

Virtual Tree Path Management for Battlefield Networks

Virtual Trees are source-rooted trees in ATM networks in which VCs originating at the source but going to diierent destinations can share some of the bandwidth pre-allocated to the VT, thus providing an additional multiplexing advantage over Virtual Paths. Non-ATM protocols such as MIL-STD-188-220A can also take advantage of Virtual Trees because source concatenation provides a beneet very simi...

Design Concepts for Strawperson AntennaCon gurations for the MMATamara

We present concepts that will be used to guide the design of strawperson conngurations for the Millimeter Array. The four conngurations include 36 4 element arrays of 10 m antennas. The most compact connguration is a lled array of diameter 95 m; the three other conngurations are ringlike arrays of diameters 236 m, 842 m, and 3 km. We describe plans for detailed studies that will be used to reen...