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SPP FIELDS V5 Antenna Mechanical Peer Review Draft 2

SPP FIELDS V5 Antenna Mechanical Peer Review Draft 2. David Glaser, Paul Turin, Jeremy McCauley, John Bonnell , Dennis Seitz SSL UCB 7/17/13. Agenda. V5 Overview Thermal Antennas Antenna to PCB PCB Housing Mount to Mag Boom FEA Analysis Other TBDs. V5 Overview.

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SPP FIELDS V5 Antenna Mechanical Peer Review Draft 2

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  1. SPP FIELDS V5 Antenna Mechanical Peer ReviewDraft 2 David Glaser, Paul Turin, Jeremy McCauley, John Bonnell, Dennis Seitz SSL UCB 7/17/13

  2. Agenda • V5 Overview • Thermal • Antennas • Antenna to PCB • PCB • Housing • Mount to Mag Boom • FEA Analysis • Other TBDs

  3. V5 Overview V5 is an electric fields antenna, mounted on the SPP FIELDS Mag Boom, that will provide 3rd axis measurements complementary to the V1-V4 data. It has only a single Preamp Previous Design ~10 inches inboard Of SCM

  4. V5 Overview SC X-axis (RAM Direction)

  5. V5 Overview V5 is an electric fields antenna, mounted on the SPP FIELDS Mag Boom, that will provide measurements complementary to the V1-V4 measurements. It has only a single OP-Amp and measures only __________________

  6. V5 Overview Antennas Positronics DD15M0000G Housing V5 PCB Housing Cover

  7. Key Issue: V5 Thermal • Minimum expected temperature <<-100°C • Occasionally will see the Sun during SC slewing • Similar Preamps have been qualified for temperatures in this range • Temperature predicts need to be modeled • Including heat losses through harness • Options for Thermal Control Being Considered: • Blanketing • Resistive heater on PCB with “clean” power source • Heater on exterior of housing • Low emissivity coating on housing

  8. Antennas 7.4” (187mm) • What drives the antenna length? • What surface finish for the antennas? 2.84” (72mm) PEEK Isolators Aluminum Aluminum wall

  9. Antenna to PCB Connection Preload on ContactNeeded Over Temperature Range A single photoetchedBeCu part makes contact between the two antennas and the PCB

  10. V5 PCB Circuit Board Currently 1.41” x 0.85” Layout 1.15” x 0.77” Max Component Height with Headroom: Top 0.34” (8.6mm) Bottom 0.056” (1.4mm)

  11. V5 PCB

  12. V5 Housing • Housing and Cover are aluminum • 0.10” wall thickness • PCB mounts to Cover with 4X #0-80 screws • Mounts to Mag Boom with 2X #4-40 Screws 1.07” 1.09” 1.71”

  13. V5 PCB to DD15 Connector Want to minimize housing size, but space is tight

  14. V5 Mount to Mag Boom TBD

  15. FEA Model Removed Holes from Box Removed Hex Nut (Interference) Fixed at Mounting Holes

  16. FEA Results 100G Quasi-static Load Top Plane Front Plane

  17. Other TBDs • Connector to PCB Wires/Connections • Harness • Qualification Plan

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