1. US SKA TDP Antenna Specification Structural Mechanical Rev B US SKA Antenna Working Group Meeting May 7, 2009, Los Angeles, California Matt Fleming Contributions from Jack Welch Roger Schultz Sandy Weinreb Gerry Harp

2. TDP AWG meeting, Los Angeles, 2009-05-07 Matt Fleming slide ‹#› of 7 TDP Antenna Specification Structural Mechanical Portion o This presentation contains the same material shown in the Antenna Specification document already distributed. o Metal Shell reflector for symmetric or offset. Design for survival then improve to spec goals as cost allows. o Specs presented in 3 sections. ( grouped ) Summary section. ( major items not related to environment )( page 3 ) Operational environments. ( Precision, standard, degraded )( page 4 ) Other items of interest. ( page 5 ) o Suggestions generated here will be included in a final version. take notes & turn them in.

3. TDP AWG meeting, Los Angeles, 2009-05-07 Matt Fleming slide ‹#› of 7 Document page 3, top half Rev B Section 1 of 3, offset

4. TDP AWG meeting, Los Angeles, 2009-05-07 Matt Fleming slide ‹#› of 7 Document page 3, bottom half TDP Antenna Summary Specs, Rev B Section 1 of 3, continued

5. TDP AWG meeting, Los Angeles, 2009-05-07 Matt Fleming slide ‹#› of 7 Document page 4, cropped Section 2 of 3

6. TDP AWG meeting, Los Angeles, 2009-05-07 Matt Fleming slide ‹#› of 7 Document page 5 cropped

7. Some suggestions so far Offset primaries defined by f/D parent? Baselines over time. ( Correlated & uncorrelated errors ) Level tolerance pedestal & az bearing ( across the continent ) Tolerance, az – el axis offset & perpendicularity. ( mfg variance ) Tolerance, el – radio axis offset & perpendicularity. Temperature stability of air supply. TDP AWG meeting, Los Angeles, 2009-05-07 Matt Fleming slide ‹#› of 7