RH: Note that use of this load below 85 GHz was removed as a requirement. Plan allows for use down to Band 1. Are there any compromises in the design with allowing for operation down to Band 1?
PY: Perhaps. Will need to test/simulate this.
RH: Concerned about air flow and use at low elevations. Are we concerned about this?
PY: Simulations due by mid-April should shed some light on what can be accomplished.
JM: Would rather not set a low-elevation limit at this time. Wait for simulation results.
RH: Why can't an actual measurement be made, rather than relying on simulations?
GHT: Can do IR camera measurements of a prototype.
PY: Would like to have a meeting/workshop at the end of phase 1 so that we can decide on a design. Phase 1 should be done in May 2009. Is this a good thing to do?
RH: Yes, as long as information on design/testing results are distributed before the meeting.
RH brought up the issue of non-linearity in receiver response and how we deal with it (which is follow-on to some questions asked by Pavel on this subject). Suggests that someone revisit past analyses of this aspect of amplitude calibration (i.e. memos by Stephane Guilloteau). Volunteers Stuartt Corder to take on this task.
Ancilliary Measurement Devices
Weather Station (P,T,RH,Ws,Wd) Instrumentation
The first production weather station has recently been installed on holography tower 2 and is undergoing tests at the OSF by AIV.
Date of Next Phone Meeting
Tentative date for next ALMA Calibration Group telecon will be 2009, March 12th 15:00 UT.
-- JeffMangum - 09 February 2009