AMiBA PROJECT WEEKLY MEETING MINUTES

Date: 18 January 2001

Participants: B. Martin, H. Wang, W. Warwick, M.Kesteven, J. Peterson, J. Payne, D. Emerson, M.T. Chen, H.C. Lu, Y. J. Hwang, W. Ho, P. Shaw, Jean Cheng

Issues and Description	Action by			Output
MMIC
1. Follow up the discussion on the HPF simulation in last meeting, Leo changed the IF frequency to 1~ 20GHz and re-do simulation, he found the internal noise power contributed from image frequency is 42 dB below ¡V55.7dBm when using the original proposed filter. And the internal noise power is almost not changed by the image signal. So he think the original specs should be OK. Leo has made a report on that simulation; he will send it over to Bob, Mal & everyone to take a look. We will discuss it further by next week. 2. As for loaning some modules from JPL, Todd says that the approval process is moving, and NASA would like to see our web site to know what we have done so far. Jean will inform Todd how to access the AMiBA web site. 3. T.H. & Eugene has measured the Specek¡¦s amplifiers many times, the test results almost the same; the major gain is around 3.5dB. Eugene has informed Specek about the result, and got some advice back. Eugene will send an amplifier back to Specek, and ask Specek check it to see if they could find out the problem. 4. Chips test in ATNF for Huei is probably be carrying on in the next week, Warwick says.	H.C. Lu M. Sinclair J. Cheng T.H. Chu Y.J. Hwang			Next meeting ASAP Ongoing
Lag Correlator Hybrid
1. There are some communications back and forth between Paul Robert and Huei's students about the circuit diagram, layout of GaAs HBT. Paul asks Huei provide the foundry design data for his reference, Huei will check it and back to Paul later on. 2. Regarding the InP HBT multipliers, Paul says that he will do packaging testing next week; probably in a week or two he should have the testing result for one of the multiplier in the packaging. 3. Regarding the LTC module fabrication for lag correlator using HBT multipliers, Warwick sent out some technical questions to the engineer of ACX in Taiwan, and now waiting for the response. Paul asks Warwick forward a copy of that email to him, so he could follow up for Warwick. 4. Regarding the 16-element correlator basis on mixer using power divider circuit, Jeff will find out the latest status, and inform us next week. He also will talk to us about what his student has done for the measurement on the MICA broadband mixer basis correlator next meeting. 5. There are some email communications back and forth between Warwick and Tzi-Dar about the developing of CMOS backend processing issue. According to the work plan, Tzi-Dar would submit 8 chips by march 5 for using in the prototype correlator. As to the LNA, Warwick and Ray are still surveying the market to see if they can find out a suitable amplifier in die or chip form.	W. Wilson H.Wang P. Robert W. Warwick J. Peterson Ray Wei W. Warwick			Ongoing ongoing Ongoing Next meeting Ongoing
Receiver
1. As per request, Mal will provide a temperature sensor board to Mingtang. Paul asks Mal to provide the cost information as well. The commercial board for 8 channels will cost $1000USD each. 2. Regarding the collaboration proposal on the development of NRAO OMT, John confirms the prototype OMT for the 3 mm band now is in good shape, the pre-production device is ready for the machine part assembly. 14 through 15 of Feb will carry on the assembly process; John will arrange someone here from Taiwan to be there, and also someone from NRAO Tucson for understanding the assembly process. And then if it passes all, we agree with the collaboration proposal. In the mean time, 8 further OMT is running for fabrication in the workshop of the Arizonan University. And hopefully, we could finish all 8 OMT by April; John will talk this with NRAO management. As for the cost, it could be $5,000 USD to 6,000USD per machining OMT. John will sort out all the traveling details with Mingtang after this meeting. John will organize the cost sharing issue with NRAO management, and keeps update what we should do. 3. Regarding the vacuum window material, Mingtang got the material from Jeff. Mal agreed to send a sample to Mingtang as well. 4. Mal will look at the summary on receiver design, which prepared by Mingtang; he will get back to Mingtang if any thing is needed to clarify. 5. Jeff sent a fax to Taiwan and Australia yesterday, spelling out a little bit detail of what he saw in Atlantic for Daze system to measure the polarization, they come up with the circular polarize very broad band very simple, he wish sharing a few idea what they done and ask people to take a look and to think about. So we will discuss it at the next meeting. 6. Jeff has emailed some pictures of receiver to everyone to look. Mingtang will send a copy of feed horn design to Jeff to review, and in the meantime Bob will talk to Mingtang about the relative design in details.	M. Sinclair B. Martin M.T. Chen J. Payne M. Sinclair M. Sinclair Everybody M.T. Chen B. Martin		Ongoing Ongoing ASAP ASAP Feb. 1^st ASAP
IF/LO
1. Warwick has received the technical data of fiber laser system from Eugene, and he agrees to buy one from IAA. So Eugene will send the price information to Warwick, and Paul will send the component to Warwick once received it from vendor. 2. As to the optical fiber (5 meters long), Yugene got response from Sumitomo in Tokyo, they agree to provide quotation to us. 3. Regarding the noise issue of the LO system, Eugene has discussed it with Mingtang, Daren and John. He will make a thorough investigation on the LO spectrum and its influence on the correlator output, in order to find a solution to reduce the noise to achieve the required sensitivity. 4. Regarding IF, Leo says that Prof. Chu has found a local vendor who can supply the cable he need.		Y.J.Hwang. P. Shaw Y.J. Hwang Y.J.Hwang		ASAP ASAP Ongoing Ongoing
Platform/Mount/Dishes
1. We got a quotation for the prototype dishes from Composite Mirror, Inc.; we are happy with the small one, but further discussion with Composite on the specification for the large dish still need to do. Bob will talk to Composite later in this week, to see how much we could reduce the cost if we change the specs. 2. We also got a proposal from Vertex GmbH about the Design / feasibility study for hexapod mount, a cost comparison vs. conventional mount will be included in this study. Fred has approved it; Vertex will submit a report in March.		B. Martin B. Martin		Ongoing Ongoing
Work plan
We have received a work plan from Huei. T.H. Z.D., Mingtang, Eugene; and looking forward to receiving a plan from Bob. Bob will review it and discuss with all responsible person accordingly.
Annual report
We have received an annual report from Warwick, Michael, Z.H., K.W. Ng, T.H./Ray, Mingtang, Eugene & Bob. Bob and Fred will review it before we could submit to MoE.
Next Meeting
7:30pm EDT, 8:30am Taiwan, 10:30 Australia, 4:30pm Tucson/Thursday/Feb. 1, 2001