W. Wild and J. Payne reported on two recent meetings of the Receiver Group. At the Cambridge meeting there were three main points: receiver specs, calibration, and optics. The specs for the HEMT amplifiers have been revised and now suggest significantly higher system temperatures than might be achieved for SIS for Band 3. Because of the scientific importance of Band 3, the ASAC felt that the implementation of Band 3 should not be driven by technology but by scientific priorities. The HFET vs SIS decision for Band 3 is under study; stability and saturation are also important issues. Concerning calibration, the receiver group agreed with the ASAC that it was not worthwhile to include cold loads. E. van Dishoeck raised the issues of tuning range and switching between sub-bands. W. Wild replied that this is also under study, and decisions, involving the ASAC, should be made shortly. From the optics meeting, J. Payne said that there has been good progress, and a report will be issued shortly. R. Crutcher asked about off-axis beams and expressed concern for polarization. W. Wild said that if one receiver is to be on-axis (as suggested in the Leiden report), it will add complication and require a re-design. S. Guilloteau commented that calibration may actually be easier with the mirrors of an off-axis system. Finally, it was reiterated that the WVR would be uncooled (or have its own cooling).

This refers to the JRDG summary for their 4th meeting. One outcome of this meeting was a special receiver optics meeting held at the end of September in Tucson. Please read James Lamb's Summary of that meeting.

(3)ALG Issues - Evans and Cox, ALG Liaisons

N. Evans and P. Cox reported on the ALG meeting of 11 September. N. Evans expressed concern about the ALG’s interpretation of ASAC recommendations on the number of 12m antennas and receiver priorities, but any misunderstandings should have been clarified by the Berkeley ASAC report. Brief summaries were given of the ALG discussions on correlators, the ACA, Japanese news on LMSA, ASTE, receiver and photonic developments, and steps towards a three-way agreement. M. Ishiguro mentioned unresolved issues, including the number of 12m antennas and the capability of the enhanced correlator.

Please read Jaap Baar's material toward a study of the form of the ACA antennas.

(4) Site Issues

A. Wootten mentioned some studies currently in progress on site issues. B. Butler and S. Radford are completing comparative studies of the Chajnantor and Pampa La Bola sites, and G. Delgado has presented a report on a 52-year climatological study for the Chajnantor area done by a consultant. A meeting will take place next month in Charlottesville to review the CBI experience. Reports from all these activities will be prepared in time for the Morroco meeting on site testing in November.

(5) Next Meeting

The next ASAC teleconference is scheduled for Monday 13th November.