1. LRR – Mechanical Alphonso Stewart Judy Brannen David Steinfeld Ilene Sokolsky Eric Jenkins

2. Mechanical Requirement Provide water-tight housing for electronic boxes and receiver cards Position instrument aperture (ground plane) external to aircraft at nadir (port 7) port Design to DC-8 aircraft requirements Provide thermal control plate for receiver cards and electronic boxes Equal cable length routing for local oscillator and noise distribution

3. Instrument to Aircraft Concept

4. Instrument With Housing 54.0 23.0

5. Housing Top Removed

6. Electronics Area (without housing) Receiver Cards (14) Wave Guide Attachment LO/Noise & Splitter Power Distribution Unit Analog I/O, Correlator, PC-104 Stack Electronic Support Plate Flexure (4) (thermal isolation ) Ground Plane

8. Instrument Ground Plane Wave Guides (14)

9. Design Features Water-tight housing –Welded aluminum shell with double o-ring seals –Interior walls insulated Wave-guide moisture abatement –Cover with 1-mil clear Kapton –Purge with dry Nitrogen gas Electronic box plate –Provides mechanical support and thermal control –Flexure mounted to ground plane

10. Ground Plane in Test Facility Ground Plane with Wave Guides

11. Instrument Dolly