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Meeting October 17, 2007

To decide if we revert the Ka Receiver to its previous configuration.

Attendees:

• Ron Maddalena, Amy Shelton, Karen O'Neil, Mark Clark, Mike McCarty, Brian Mason, John Ford, DJ Pisano, Andrew Baker, Andy Harris, Stephanie Zonak, Galen Watts

Agenda Items:

Commissioning and Test Results

• OMT Lab Measurements: OMTs not well attenuation matched at the 0.25 dB level. Additional problems stem from impedance mismatching.
• GBT Spectrometer: Current configuration superior for most observers. 36-40 GHz performance much better than previous. Halving the number of channels and reducing Trx will require adding about 20% to observing times. Ripples in circuitry after second hybrid but on a larger scale than narrow emission lines.
• CCB: Performance adequate but cannot do polarimitry.
• Zpectrometer: Better stability. Remote observing much easier.

Software Modification Requests

• Status: None of priority 4 MRs completed, added to CME. All priority 3 completed soon.

Decision:

Keep Ka Receiver as it is for semesters 07C and 08A.

Other Issues

• Decision to revert or modify receiver at a later time needs Science Case and Resource Assessment, defer decision until future (Nov '07?) meeting.
• Dynamic scheduling during 8B could allow Ka observing through the summer.
• When to address minor issues such as second hybrid ripple.
• A single feed with dual circular in Total Power mode may provide enough polarization information.

-- GalenWatts - 16 Oct 2007