spp fields v5 antenna mechanical peer review david glaser, paul turin, jeremy mccauley, john...
TRANSCRIPT
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SPP FIELDS V5 Antenna Mechanical Peer Review
David Glaser, Paul Turin, Jeremy McCauley, John Bonnell, Dennis Seitz
SSL UCB7/17/13
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Sep. 23, 2012 SPP FIELDS Meeting
• V5 Overview• Thermal• Antennas• Antenna to PCB• PCB• Housing• Mount to Mag Boom• Antenna FEA Analysis• Other TBDs
Agenda
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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 inboardOf SCM
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V5 Overview
SC X-axis (RAM Direction)
Old Boom Design Shown Here
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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 uses a single op amp to cover the LF+MF DC-1MHz frequency range
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V5 Overview
Positronics DD15M0000G
Antennas
V5 PCB
Housing Cover
Housing
Mass: ~70 g
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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
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Antennas
9.73”
4.00”
AluminumAluminum
wall
PEEK Isolators
• What drives the antenna length?
• What surface finish for the antennas?
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Antenna FEA Results 100G Quasi-static Load
Load Direction
Load Direction
100G Stress < 10 ksiFirst Mode Frequency: 493 Hz
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Antenna to PCB Connection
A single photoetched BeCu part makes contact between the two antennas and the PCB
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V5 PCB
Circuit Board Currently1.41” x 0.85”
Layout1.15” x 0.77”
Max Component Height with Headroom:Top 0.34” (8.6mm)Bottom 0.056” (1.4mm)
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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”
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With Backshell
Glenair, 557T186
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V5 PCB to DD15 Connector
Want to minimize housing size, but space is tight
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V5 Mount to Mag Boom TBD
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FEA Model For Antennas
Removed Holes from BoxRemoved Hex Nut (Interference)Fixed at Mounting Holes
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Other TBDs
• Connector to PCB Wires/Connections• Harness• FEA with Connector & Backshell• Qualification Plan
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Backup Slides
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PCB Schematic
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V5 PCB Mech. Drawing
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PCB Layout
• Heater resistor is R9• Layout area could be reduced by
having an external heater• C1, C2 might be reduced or
eliminated, but that might lower bandwidth (TBD)
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V5 SPF Interface