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RadioAstron Monthly Notices October 2005 I. Tasks and developments completed in the ASC in the period April-October 2005. 1. The Second Addendum to the Conceptual Design of RadioAstron Scientific Complex (ACD-2) was composed, agreed and issued. The document consisting of 135 pages describes all modifications, reformations and innovations introduced to the Scientific Complex. The document was presented at the Meeting of General Constructors in Lavochkin Association and it was also subjected to formal evaluation by the Central Research Institute of Machine Science. 2. SRT Engineering Model was disassembled in LA, and some devices of the scientific equipment were subjected to tests in ASC laboratory in order to examine the reason of high system temperatures measured in Pushchino. Intrinsic loses in the feed system and receiver noise temperature were measured in all three frequency ranges. The design of the feed system was modified. New 6-cm and receiver is being designed. Engineering model of 1.35-cm receiver was manufactured. 3. The requirements on possible interferences from electro static discharges were formulated. 4. Necessary corrections to the technical documentations were done in accordance with the ACD-2. 5. Flight models of some devices were delivered to the ASC. They will undergo acceptance tests. 6. Compatibility tests of the Engineering Model of the Formater with the SRT scientific equipment were successfully conducted in May 2005. 7. Service Bus of the spacecraft is being assembled in LA to be subjected to vibration tests. 8. The first dummy scientific program was simulated for the period of 4 months (from February 1 till May 31 2008) in order to understand potentials of science operations under all functional constraints for high apogee RadioAstron orbit. 9. A proposal to EVN for VLBI observations of OH maser flare in W75N was submitted and has been granted observing time. ===============================================================
Appendix (The list of used acronyms) ASC Cold Plate DC Astro Space Center of Lebedev Physical Instutute cooled LNAs and antenna feed hermetic device container (part of payload); it contains Formatter, Rb oscillators, synthesizer, control unit and is placed under dish DM Device Module = DC + H-maser EGSE Electronic Ground Support Equipment Electronic Complex ­ all SRT electronics EM Engineering Model FC Focal Container ­ hermetic package with the scientific payload; it contains receivers, microwave synthesizer, control unit and is placed in focal site of dish FM Focal Module = Focal Container+Cold Plate


LA OHCFS-SRT OHFS-SRT ORFS-SRT RSA Service Module, SRT TMS TVT VIRK ZBIT

Lavochkin Association Space Radio Telescope On-board Heterodyne and Clock Frequency Synthesizer set Space Radio Telescope On-board Hydrogen Frequency Standard Space Radio Telescope On-board Rubidium Frequency Standard Russian Space Agency Spacecraft bus ­ spacecraft itself (without payload). Space Radio Telescope (all scientific payload including 10-m dish) Spacecraft Telemetry System (technical) Thermo-Vacuum Tests Scientific high rate (up to 2x72 Mbit/s) radio complex, including transponder Zero Baseline Interferometer Tests (ZBIT)