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EVLA Front-End CDR

EVLA Front-End CDR. Feed Circle & Receiver Mounting. Flattened Feed Circle Layout. Feed Circle Layout. Vertex Cabin. Vertex Cabin. Each Feed is Tied into the Vertex Cabin Except the L-Band The Size and Receiver Weights Determine the Mounting Method for the Feeds and Receivers.

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EVLA Front-End CDR

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  1. EVLA Front-End CDR Feed Circle & Receiver Mounting EVLA Front-End CDR – Feed Circle & Rx Mounting April 24, 2006

  2. Flattened Feed Circle Layout EVLA Front-End CDR – Feed Circle & Rx Mounting April 24, 2006

  3. Feed Circle Layout EVLA Front-End CDR – Feed Circle & Rx Mounting April 24, 2006

  4. Vertex Cabin EVLA Front-End CDR – Feed Circle & Rx Mounting April 24, 2006

  5. Vertex Cabin • Each Feed is Tied into the Vertex Cabin Except the L-Band • The Size and Receiver Weights Determine the Mounting Method for the Feeds and Receivers EVLA Front-End CDR – Feed Circle & Rx Mounting April 24, 2006

  6. Receiver Weights EVLA Front-End CDR – Feed Circle & Rx Mounting April 24, 2006

  7. Receiver Mounting • Three Options for Receiver Mounting • Fully Fixed to Vertex Cabin • Fixed to Feed and Fixed to Vertex Cabin • Fixed only to Feed EVLA Front-End CDR – Feed Circle & Rx Mounting April 24, 2006

  8. Receiver MountingQ and Ka • The Receiver is Directly Mounted to the Feed Tower. • The Feed Holds No Structural Load • The Receiver is Attached to Side of Vertex Cabin • No Major Stress Concentrations EVLA Front-End CDR – Feed Circle & Rx Mounting April 24, 2006

  9. Receiver MountingK and Ku • Feed Attached to the Feed Tower • Receiver Attached to the Vertex Cabin Wall • No Significant Stress in Feed EVLA Front-End CDR – Feed Circle & Rx Mounting April 24, 2006

  10. Receiver Mounting EVLA Front-End CDR – Feed Circle & Rx Mounting April 24, 2006

  11. Receiver MountingL S C X • The Feed is Secured at the Mounting Flange and the Throat Section • The Receiver is Attached Solely to the Feed EVLA Front-End CDR – Feed Circle & Rx Mounting April 24, 2006

  12. Mounting the L-Band EVLA Front-End CDR – Feed Circle & Rx Mounting April 24, 2006

  13. Keeping the Feeds DryRadome • Sealing The Feeds • All Feeds or Feed Towers are Sealed with Radome to Keep Moisture Out • Types of Radome • Esscolam 10 for L, S & C • Gore RA7906 for X, Ku & K EVLA Front-End CDR – Feed Circle & Rx Mounting April 24, 2006

  14. Keeping the Feeds DryDry Air Systems • All Metal Feeds Sealed with O-Rings • Desiccants • Dry Air Compressors • Costly • Positive Pressure Vertex Cabin • Experimental EVLA Front-End CDR – Feed Circle & Rx Mounting April 24, 2006

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