1. An Overview of a Solar Eclipse Video Payload Alex Peters Iowa State University

2. Solar Eclipse Overview Mission Extended Duration Camera Pointing Live Video Streaming Re-usable after Eclipse

3. Communications Overview Radio Antenna Payload Ground

4. Radio Ubiquiti Rocket M5 5.8 GHz 158 grams Configurable Used by Google Loon 8 Watt maximum output

5. Antenna-Payload Requirements High gain Large beam width Light weight

6. Antenna-Payload Split Sheath Dipole Circular Polarized 4.5 dBi gain Handmade/tuned Designed by Ethan Harstad

7. Antenna-Payload Quad Patch 11 dBi Vertically Polarized Pre-built

8. Antenna-Payload Fat Shark Circular Polarized Pre-built Tested to 40 miles

9. Antenna-Ground Station L-Com HyperLink 16.5 dBi Beam width 30 deg Vertically polarized Image from L-com.com

10. Altitude Control Two Types Passive Zero Pressure Super Pressure Active Ballast Vent Density

11. Altitude Control-Passive Methods Zero Pressure Long Duration No extra control needed Hard to make and obtain

12. Altitude Control-Passive Methods Super Pressure Long Duration No extra control needed Hard to make and obtain Longest lasting balloon style

13. Altitude Control-Active Methods Ballast Extra weight dropped from payload during flight Often combined with other control methods

14. Altitude Control-Active Methods Vent Release helium from the balloon Avoids burst Gives greater control of balloon Can be used on latex balloons

15. Altitude Control-Active Methods Density Control Pressurize helium or air to control available lift Single system for both “ballast and vent” Allow control until battery dies Used by Google Loon

16. Video Raspberry Pi Compresses and Streams using Gstreamer Uses Raspberry Pi Cam with CS mount for video capture

17. Gimbal 3 Brushless motors 360 deg rotation Hollow tube construction Weight saving Allows for cable management Simple Construction

18. Conclusion It can be done Need more testing on most components especially altitude control