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

2. Sep. 23, 2012 SPP FIELDS Meeting V5 Overview Thermal Antennas Antenna to PCB PCB Housing Mount to Mag Boom FEA Analysis Other TBDs Agenda

3. V5 Overview V5 is an electric fields antenna, mounted on the SPP FIELDS Mag Boom, that will provide 3 rd 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 Positronics DD15M0000G Antennas V5 PCB Housing Cover Housing

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) 2.84” (72mm) Aluminum wall PEEK Isolators What drives the antenna length? What surface finish for the antennas?

9. Antenna to PCB Connection A single photoetched BeCu part makes contact between the two antennas and the PCB Preload on Contact Needed Over Temperature Range

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 1.71” 1.09” 1.07”

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