Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.asc.rssi.ru/RadioAstron/documents/receivers/eng/18cm_eng.pdf Дата изменения: Fri Jun 24 14:30:34 2011 Дата индексирования: Tue Oct 2 00:56:46 2012 Кодировка:

The 18 cm RadioAstron receiver had been produced in compliance with "Memorandum of Understanding" between Australia (CSIRO) and Russia (ASC FIAN, former IKI) that was signed in 1987. As a result, the engineering model, two flight models (FM1, FM2) and two test sets had been delivered to the ASC. Each model has the following parts: 1) low noise amplifier (LNA); 2) receiver box; 3) DC-DC converters produced by Russia. The engineering model of the receiver had been integrated to the engineering model of the spa ce radio telescope, and it had passed the radio astronomical test in the Pushchino successfully in 2003. Flight models were delivered in July, 1994 to the ASC. Flight 1) 2) 3) Flight 1) 2) 3) model FM1 has the following parts: LNA MY-18, serial number PN 01-0252, factory number FM1; receiver box KRT-18, serial number PN 17660-01, factory number FM-001; DC-DC converters IVEP1 and IVEP2, factory number 05. model FM2 has the following parts: LNA MY-18, serial number PN 01-0252, factory number FM2; Receiver box KRT-18 serial number PN 17660-01, factory number FM-002; DC-DC converters IVEP1 and IVEP2 factory number 06.

Manufacture date of the both flight models is April, 1992, operating time is five years. Manufacture date of the DC-DC converters is June, 1990, operating time is five years. Testing (short functional test) of the flight models was carrying out every year periodically. Decision about carrying out of work for prolongation of the operating time was accepted in July 2003. See Appendix 1. Within the bounds of this work we have made a contract with the former firm for producing new DC-DC converters for 18 cm RadioAstron receivers, and the test program draw up. See Appendix 2. The test was carried out in November ­ December 2004 with beneficial effect. Decision (See Appendix 3) about prolongation of operating time untill 2007 was made taking into account following aspects: the positive results of the test, no indications of degradation output parameters were found, life time of the electronic components is more then twenty five years, calculated safety factor is 0.9987,
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according to the point of view of the designers the safety factor is not changed during the storage period, See Appendix 4, at the moment the 18 cm RadioAstron receiver is worked out 4 % of the active functional time only, new DC-DC converters are produced. The 18 cm RadioAstron receiver FM1 had been integrated to flight electronic complex of the RadioAstron in November 2006. We have made the above mentioned test in order to prolong the term of the operating time up to 2011.

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Appendix 1

Astro Space Center Russian Academy of Science May 2008 A decision for prolongation of the appointed parameters of the devices of the Project "RadioAstron" scientific complex (in Russian): «»
1. «-» . , , . , 2002 ., - 15 2006 . 2009 . 11 1999 . 2. , . 3. . . 4. , ­ .

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5. 2. 2 1 , . . *) . . . - . (, , .) . ( ) . *) - 2003. 2003 .

2

3 4 5 6 7

2003 . 2003 . - 2004 . 2004 . 2004 .

*) : 1) , . 2) , . ( ) . 6. ­ , «-». 2003 . 2004 . 800 . . .
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Appendix 2. The Test Program 1. Functional tests Level 1. Functional tests has to performed in normal environmental conditions: temperature: 20±5oC. humidity: <80%. pressure: 1013±50 mbar. 1.1 Functional tests ­details 1.1.1. Isolation test 1.1.2 Initial operational checks 1.1.3 Check joint test 1.1.4. Check channel compatibility 1.1.5 Check tone injection channel 1.1.6 Check control commands 1.1.7 Check heater protection 1.2 Read P-KRT-18 monitoring channels 1.2.1 Analog total power 1.2.2 Digital total power 1.2.3 Temperatures 1.3 LNA MY-18 bias parameters 1.4 Power supplies output voltage 1.4 Heater power protection 1.5 Read Test Set monitoring channels 1.6 IF total power 1.7 Input currents (27 v supply) 1.8 In-rush currents (27 v supply) 1.9 Measurements of receiver parameters 1.9.1 IF output level 1.9.2 Bandpass of receiver 1.9.3 Receiver stability 1.9.4 Receiver noise temperature using hot/cold method 1.9.5 Calibration of the noise sources 1.9.6 rms noise fluctuations by statistical method

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2. Functional tests Level 2 (At 5oC and 40oC ambient temperature; 27 V max and min) 2.1 Read monitoring channels 2.2 Gain stability over 1000 sec period 2.3 Noise sources levels 2.4 Current consumption power supply parameters 3. Electro magnetic compatibility tests 3.1 Permissible emission from 18 cm Radioastron receiver 3.2 Electromagnetic susceptibility levels for 18 cm Radioastron receiver

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Appendix 3

Astro Space Center Russian Academy of Science May 2008 The decision 92-05 of March 11th, 2005 about prolongation of service life of the on-board flight devices (in Russian): 92-05 11 2005 . --18 001, 002, ""
5 8 2 1 . 0 7 . 0 3 . - 2004 ( 1 2) "-" "" - --18 001, 002, 1992 . " " 24.05.04 . " "". . : 1) , 2) , 3) , 20 , 4) --18 0.9987, 5) - , 6) 4% ,
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7) 2005 ( ), --18. : --18 001, 02 2007 . .

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