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["University's Requirements","Tenderer's Response"]
[null,"Tenderers are requested to detail how they will meet each of the University's requirements listed below."]
["1. Antenna Frequency Coverage"]
["The antenna is  to be capable of operating across the frequency range of 1.5 to 17 GHz as a minimum. Tenderers may wish to quote for the option of  upper frequency limits of 32  and 43 GHz. An upper limit of 32 GHz is the much preferred option provided the cost is not prohibitive."]
[]
["2. Antenna Optics and Structure"]
["The primary reflector of the antenna is to be 12-m in diameter. Tenderers may wish to quote on larger diameter antennas up to 20m.The optics are to be cassegrain with a shaped primary and secondary. Tenderers are invited to quote for optics suitable for both wide-band (2 – 17 GHz) and S/X-band (2.2 – 2.45 GHz and 8.1 – 8.9 GHz) collinear feeds, both cryogenically cooled and room-temperature. The opening angles of the feed may be such that a cone-like mounting structure is required, rising from the vertex of the antenna. In this event the cone is to  be enclosed and suitable for housing the feed and receiver (possibly cryogenically cooled), up to a mass of 200 kg, in a thermally stabilised environment. It must be structurally rigid so as to not change the focus position as a function of elevation by more than 1 mm. Tenderers are to provide the option of modifying the cone (if necessary) to support wide-band or narrow-band S/X feeds."]
[]
["The materials of the dish, mount and pedestal are open and must be specified by the Tenderer.  Likewise the design is open."]
[]
["3. Aperture Efficiency"]
["The aperture efficiency is to be at least 75% at the highest frequency."]
[]
["4. Feed"]
["Tenderers are invited to quote for the supply of a feed for the antenna capable of making simultaneous observations in the frequency ranges 2.1 - 2.4 GHz and 8.1 - 8.9 GHz. The output signals are to  be both hands of circular polarization at each frequency."]
[]
["5. Feed Translator"]
["While this RFT is concerned specifically with a single feed and receiver, it is hoped that in the future multiple bands will be supported, requiring a mechanism for automatically moving feeds to the focus position. Tenderers may also wish to quote as a separate item for the ability to retro-fit a feed translator so that the antenna could support multiple receivers at a future date."]
[]
["6. Subreflector Positioning and Tracking"]
["The subreflector is to  be supported such that changes in ambient temperature do not cause a change in the focus position. Changes in the subreflector position with respect to the main reflector and feed due to gravitational deformation should be negligible for operation up to frequencies of at least 17 GHz. If the antenna is capable of operating above 17 GHz, Tenderers are requested to manufacture the subreflector such that the focus is adjustable to track any gravitational deformations in the primary reflector. It is important that subreflector positioning is repeatable to 0.5 mm accuracy or better. The hardware to provide automatic subreflector tracking is not required in this RFT but the costs to to retro-fit it in the future is requested as a separate item."]
[]
["Cable Wrap and Pedestal"]
["A cable wrap mechanism is required to guide up to 20 cables, of standard coax size, from the receiver cone to the base of the pedestal. Eight of the cables will be optical fiber. Sufficient space for 8 optical transceivers in the cone and the pedestal should be provided, although the transceivers themselves are not requested here. The pedestal design and material are open; however the design must incorporate a secure, water and air-tight enclosure to house both the power distribution board and an RFI-tight box for the control system. The enclosure is to be capable of being air-conditioned and easily accessible. Tenderers are to specify the available space inside the pedestal."]
[]
["7. Antenna Surfaces"]
["The dish surface is not expected to be load-bearing – i.e. no one will walk on it. The reflecting surface must have a finish to minimize the thermal loading at the focus when pointing near the sun: two coats of Hi-Reflectance White, manufactured by Triangle Paint Company Inc of 1930 Fairway Drive, San Leandro, California, or its equivalent, is recommended, resulting in a 50 micron dry film thickness, for metal reflector surfaces. In the case of a non-metal reflector, details of the proposed  equivalent finish and performance must be provided in the Tender. The underside of the antenna surface is to be coated with a similar primer as the reflecting surface and finished with a suitable top coat (e.g. semi-gloss industrial grade white such as Croda Acidol HD). The final coating procedures will be submitted by the Tenderer for approval."]
[]
["8. Antenna Mount"]
["The antenna mount should be of an Altitude-Azimuth design with azimuth range of +/- 270 degrees from a neutral point to be specified. The elevation range should be from 5 to 90 degrees. Tenderers are invited to quote for the option of a 3 to 90 degree elevation range (which is preferable), as well as “over-the-top” options such as a 3 to 177 degree elevation range, possibly with reduced azimuth range. "]
[]
["9. Slewing and Tracking Requirements"]
["The normal mode of operation of the AuScope antennas will be 180 x 24 hour observation sessions per year. Observations will involve slewing between targets for approximately 50% of the time at a rate of approximately 60 slews per hour. A slew may be up to 180 degrees and observations will be of 30 seconds or less. Slew rates should be at least 4.5 degrees/sec in azimuth and 1.25 degrees/sec in elevation. Preferable slew rates are 6 degrees/sec in azimuth and 2 degrees/sec in elevation. Tenderers are invited to quote for both the minimum and preferred slew rates as well as the option of upgrading the antenna from the slower to the faster rates. Tenderers are required to state the drive acceleration (in deg/s/s) in both axes which should be high enough to enable the required number of observations to be performed."]
[]
["10. Operating Conditions"]
["The antenna and its control system should be designed for a lifetime of 20 years, given normal operating conditions which are: "]
["(i)             wind speed less than 70 km/hour; "]
["(ii)           ambient temperature in the range -10 to +50 degrees C "]
["The antenna must be capable of surviving wind gusts up to 150 km/hour when in safe stow mode. Full lightning protection must be provided for all components of the control and drive system. "]
[]
["11. Antenna Control and Monitor Interface"]
["The antenna must be supplied with a system that allows precise tracking of astronomical objects and provides for safe operation of the antenna at all times, including components such as limit switches, emergency stop options, following errors and other servo errors. The interface must provide the ability to switch drives and brakes on or off and to control the drive speeds. The ability to be able to accurately specify and control the drives at low rates is important for good astronomical tracking. The control/drive system must be able to maintain a pointing accuracy of better than a factor of 0.1 times the FWHM of the primary beam at the highest frequency under all normal operating conditions. Output data to include status information on drives, brakes, drives rates, antenna position, drive error states, safety switch states and limit switch states. UTas has existing antenna control software which controls the antenna drive rates through analogue signals in the +/-10V range and TTL digital signals. Compatibility with this system is desirable, but not compulsory. The Tenderers are to specify the form of the input and output signals (e.g. TTL, analogue -10 -- 10 V etc) and the rate at which the input/output information is read/updated. Alternate antenna control procedures, e.g. providing a list of times, azimuths and elevations via TCP/IP protocols, may be specified. However, the precise Interface Protocol Document will be agreed with the project team before construction begins"]
[]
["An operator panel providing basic controls from the pedestal, independent of the software systems, must also be provided. The entire control system must be housed in RFI-tight box(es) installed within the antenna pedestal. "]
[]
["12. Radio Frequency Interference"]
["Over the frequency range of 1.5 to 17.0 GHz, the control system equipment enclosure needs to meet an Equivalent Isotropically Radiated Power (EIRP) emission level at a distance of 3 metres of no more than -122 dBm at 2.0 GHz, increasing to -100 dBm at 17 GHz, as illustrated in Figure 1. The contractor will be required to provide evidence that the complete enclosed control system has been tested under a certified compliance testing regime. "]
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["Figure 1: Maximum tolerable RFI from the control system."]
[]
["13. Power"]
["Tenderers are required to quote the total maximum power rating of the antenna and all of its systems. Power factor correction equipment is to be incorporated into the main power distribution board to maintain a power factor of 0.95 lagging or better at the incoming supply point for the expected load rating of the installation. Surge protection equipment must be incorporated into the main distribution board to protect the installation from over voltage events caused by e.g. lightning in the vicinity of the antenna. "]
[]
["14. Maintenance and Spares"]
["The design lifetime for the antenna to be twenty (20) years. Tenderers are to  detail an anticipated maintenance schedule and budget including:"]
["(i)             The antenna motor running time between maintenance; "]
["(ii)           Drive gear failure timescales;"]
["(iii)          Expected durability of the antenna surface finish (i.e. time between repainting);"]
["Full documentation of the antenna as-built will form one of the deliverables of the contract.  "]
[]
["Some of the antennas in the AuScope array will be at isolated locations with day-to-day operations conducted remotely from Hobart. A high level of reliability is therefore desirable and, in the event of a problem, it is important that the resources necessary to return to operation quickly are available. Given these operational requirements, Tenderers are required to provide a list of recommended spare equipment for the antenna as a separate budget item."]

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