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SPP FIELDS V5 Antenna Mechanical Peer Review
Draft 2
David Glaser, Paul Turin, Jeremy McCauley, John Bonnell, Dennis Seitz
SSL UCB7/17/13
Sep. 23, 2012 SPP FIELDS Meeting
• V5 Overview• Thermal• Antennas• Antenna to PCB• PCB• Housing• Mount to Mag Boom• FEA Analysis• Other TBDs
Agenda
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
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 __________________
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
Antennas
7.4” (187mm)
2.84” (72mm)
AluminumAluminum
wall
PEEK Isolators
• What drives the antenna length?
• What surface finish for the antennas?
Antenna to PCB Connection
A single photoetched BeCu part makes contact between the two antennas and the PCB
Preload on ContactNeeded Over Temperature Range
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)
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”