New PDF release: Mars Observer : National Aeronautics and Space

By United States. National Aeronautics and Space Administration

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Additional resources for Mars Observer : National Aeronautics and Space Administration/Space Transportation System Phase O Safety Review Data Package

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The downlink signal can be modulated by the t u r n around ranging signal o r t h e telemetry data system from the C&DH subsystem or both. The transponder can be commanded a l s o t o provide a one-way ranging modulation signal instead of two-way ranging. A t any given time, only one of the two transponders has i t s e x c i t e r section energized. The output from t h e energized exciter goes through a 3-db h y b r i d coupler which feeds the signal t o both rf power amplifiers, only one of which i s energized, The rf power amplifier provides a 40-watt output t o an i s o l a t o r and rf f i l t e r .

DSS/TUTS. 54 J ;B I I I I I I I I I I I I I 1 I I I I I I I I I I I I 1 F i g u r e 3-6. I I TUTS T e s t Configuration. 55 o Generate simulated spacecraft PCM telemetry. o Decode and display SCS-generated spacecraft commands. o Provide r e s i s t i v e load f o r battery charge current from RLE power supply. o Provide r e s i s t i v e load and status indication of discrete commands generated by the RLE f o r the SIU. o Generate simulated SIU bilevel s t a t u s telemetry via front panel switches.

To s a t i s f y t h i s length the boom i s fabricated i n two sections joined by a 180' hinge. The inboard boom i s hinged t o the zenith side of the spacecraft, and when f u l l y deployed i n t h e mapping o r b i t , the entire boom extends i n the zenith direction. Figure 2-9 shows the boom i n i t s stowed, cruise and mapping o r b i t configurations. The antenna i s attached t o the gimbal system which i n t u r n i s joined t o the outboard end of the outboard boom. During launch the inboard boom i s latched t o the nadir end of the spacecraft structure.

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Mars Observer : National Aeronautics and Space Administration/Space Transportation System Phase O Safety Review Data Package by United States. National Aeronautics and Space Administration


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