1. Huei has sent some second iteration chips of GaAs to Mal; Mal will help testing on them.
2. Fred has sent an email to J. Weber to explore the collaboration possibility with NRAO on the packing and testing of MMIC, and now is waiting for response.
3. Huei will visit TRW and JPL by May 17 and 18, and met Richard Lai, Todd and, Sandy Wienreb respectively.
4. Jeff talked to Neil Erickson, Neil offered to provide out of the UMass wafers sufficient number chips for AMiBA, and they have done a selection already to try to get the best one; and the best one is 30 Kelvin, and so far they test cold for noise about 100 amplifiers. The best one is came from two wafers, and they have plenty left, and enough to offset AMiBA completely. However they mostly found the wafer is not as good, and their system temperature are measured the amplifier range be about 50 Kelvin. The caution is the TRW doesn't know exactly what they do differently on these two wafers. So if we repeat the order, we might get two wafers are both 50 Kelvin, or get two wafers both are 25. Jeff suggests that we should accept a set of amplifier from UMass, and put them in the blocks and test them preparing install in the final AMiBA setup. And then also join in the next run of fabrication that takes place in December of 2001, and we hope to get better set of amplifier. We can join in the existing run with Todd and Sandy doing anyway for not much money, soothing about 25K to 30K USD. And mean while, we can start with setting up amplifier we actually make the instrument work. Fred says that that will be a good thing to do in terms of getting start learning packaging, testing and so on, we have to get start and to get student involve. And also important to work out the wafer run, how we take part in? what do we do as Huei and as Warwick? Do we have more packages in States and ship them to Hawaii, or have chips comes to Taiwan and package here, or go to Australia to package. Fred will keep on talking to John Weber, and Jeff will talk to John as well to see if we can cooperate with NRAO for wafer run, packaging and testing. And to do so, we need to send somebody to NRAO to do the packaging and testing. That will be an easier approach if we can get the MIC amplifiers from NRAO as we did for MIC amplifiers as wellJeff will ask Todd, Neil and Sandy what their schedule plan are, so we can join that sort of thing, there will be more cost effective and better than everybody to do their own run. The more we can find out, the more figure out what people willing to do, and the better we can decide.
5. AT will have a wafer run in this July, Warwick asks Huei whether he plans to put his idea on that run? Huei will think about it and talk to Mal as well. Jeff will talk to Sandy to see whether Sandy agrees AT using his design.

H.Wang
K.Y.Lo

H.Wang

J.Peterson K.Y.Lo

H.Wang
J.Peterson

Ongoing
Ongoing

Ongoing

Action item

Action item

1. Warwick has discussed with Mike about exactly what resources we need for correlator. They almost come a conclusion that we don't need the x-y correlators, and as long as we have a correlator noise rejection signal in both antennas, we only need to afford a baseline polarization products, we should able to calibrate everything on that, we just need to have a few more iteration on that to make the final decision.
2. Regarding the Silicon Germanium, Huei's student will prepare the layout and model, and send them to Warwick. Warwick will talk to Paul Robber to see whether he can work out systematic design and simulation design before May 28.
3. Huei has received the test data of the Gilbert Cell Multiplier chips from Warwick, and he don't know why there is a low frequency drop after 4 GHz, and it differs with the test result done by Huei's student. Huei will resend those data to Paul & Warwick to look at. Warwick says that he will check it with Paul, but he also highlights the major problem of the Gilbert Cell Multiplier is its bandwidth is not sufficient. We need to find a better device, and the Silicon Germanium is the option we are looking into.
4. Bob, Warwick, Jeff, Ray and Paul had a phone discussion about the prototype on last Friday, we came to an agreements on basically, the current plan is Jeff brings his mixer based correlators to AT and to measure them in July. And Ray should send the back end chips to AT within two weeks, and come to AT for system integration by end of July. But Ray will enroll the military in June for 22 months, so we need to talk to Prof. Chiuch to find someone else to carry on Ray's work. Paul will set up a meeting for Fred and Prof. Chiueh; Prof. Chiueh will be back here Today, Ray said.
5. Jeff is waiting for the delivery of the components for the prototype scheduling to be done in this week.
6. Regarding the CMOS output processing chips, Ray has done another approach by using the OPS, and the frequency range will be enlarged 5 MHz, and he think the second iteration will be better than the first one, the new chips will be back by end of June. The first iteration chips will be sent to AT by next week, Ray said.

W.Wilson

H.Wang
W.Wilson

W.Wilson
H.Wang

R.Wei
T. D.Chiuch

J.Peterson

R.Wei

Ongoing

Action item

Ongoing

Ongoing

Ongoing

Ongoing

1. Mal will follow up to see if he can get a beam pattern analysis on the feed horn and antenna to see how accurate we can simulate the lens.
2. Warwick says that Mal has a report on the circular polarization, and he is planning to send it to Paul, probably in tomorrow.
3. Regarding the NRAO OMT production,NRAO people is looking for another two possible shops to manufacture OMT in order to speed up the process. M.T. will keep on watching it. The Chungshang Institute is still working on the pricing
4. Mal will get some specification on the far field range testing, and send it to Leo and Bob to look at

M.Sinclair

M.Sinclair

M.T.Chen

M.Sinclair

Ongoing

Ongoing

Ongoing

Ongoing

1. Eugene says that they have got all instrument installed and tested, during the past week. The dual channel power meter and a noise source are work well with the high frequency spectrum analyzer now, except some reading miss-measurement between the output power laser and the power meter.
2. Eugene is trying to figure out the feed back loop in three fiber cables, two cables send signal to each antenna, and use one cable to carry back the signal to the central unit for phase control in order to shorten the cable length from the central unit to each antenna. He will calculate the accuracy of this configuration, and compare with the original optical fiber configuration.
3. Regarding the optical amplifier, Eugene is keeping on looking for the quotation of the components of commercial market.
4. Fred had signed the purchase request of Eugene for the conventional LO components.

Y.J.Hwang

Y.J.Hwang

Y.J.Hwang

Ongoing

Ongoing

Ongoing

1. Bob says that the small dishes is no longer on schedule, CMA has problem with the delivery from its subcontract of the tool making the mould. So it looks like the delivery will be delay 4 to 5 weeks,may be in July 1. As to the large dishes, Bob got the quotation from CMA, he will talk to Paul laterafter this meeting.
2. Bob, Philippe and Paul had a phone discussion with Vertex last Monday, some initial price information, and we will get a written quotation today. This is the first time we heard the final pricing of the traditional mount is significant less than the hexapod one about 40% difference. So the issue is becoming complex, because if to go with the classic mount, another consideration is the size, above the ground, and size of the ground shield, and the protection needed. We have not yet look at that all, and cost together.
3. As for the conventional mount, they got the quote back from the Sydney Engineering Co., it is 1.25M AUD (625K USD), Warwick says. He got some notes from them; he will forward it to Bob and Paul to look at. Regarding the access problem which Bob has been concerning, it should be highlighted to the Company as well, Fred reminds Warwick.

B.Martin

B.Martin

W.Wilson

Ongoing

Ongoing

Ongoing

W.Wilson

Ongoing