1. Upgrading the ATA Feed Jack Welch and Matt Fleming

3. Tsys: Measured & Calculated

4. ATA Feed Gain

5. Feed In Glass Dewar

10. Low Pass Filter

11. Reflection of Plane Wave from Flat Glass of Thickness 0.46 mm

12. Dewar Model

13. Glass Bulb Test Setup

14. Bulb D

15. Bulb E

16. Bulb F

17. Bulb G (Beaker)

19. Grid for Stress Calculation

20. Results of Stress Calculations

21. Thermal Loads I. Radiative @ 1.8 mWatts/cm 2 : inside pyramid, tip of pyramid, tip feed arms: 330mw II. Heat flow along pyramid through 1cm patches: 1.7 watts; through feed arms: 1.0 watts III. LNAs: 170 mwatts IV. Output cables: 24 mwatts Total: 3.12 watts Refrigerator capacity: 6-7 watts from 70K.

22. Gain Pattern for Symmetric Cassegrain and Unblocked Gregorian Θ in radians Gain (Θ)