1 / 19

EVLA Front-End CDR

EVLA Front-End CDR. C-Band (4-8 GHz) EVLA Receiver. EVLA C-BAND PERFORMANCE PROJECT BOOK REQUIREMENTS. C-band Block Diagram. Estimated EVLA C-Band T Rx , Output Power & Headroom. Vacuum/RF Window. Interim AMC (narrow band) Polarizer #1. Note length, vs. Production OMT.

ojal
Download Presentation

EVLA Front-End CDR

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. EVLA Front-End CDR C-Band (4-8 GHz) EVLA Receiver EVLA Front-End CDR – C-Band Receiver April 24, 2006

  2. EVLA C-BANDPERFORMANCEPROJECT BOOK REQUIREMENTS EVLA Front-End CDR – C-Band Receiver April 24, 2006

  3. C-band Block Diagram EVLA Front-End CDR – C-Band Receiver April 24, 2006

  4. Estimated EVLA C-BandTRx, Output Power & Headroom EVLA Front-End CDR – C-Band Receiver April 24, 2006

  5. Vacuum/RF Window EVLA Front-End CDR – C-Band Receiver April 24, 2006

  6. Interim AMC (narrow band) Polarizer #1 Note length, vs. Production OMT EVLA Front-End CDR – C-Band Receiver April 24, 2006

  7. Interim VLA (salvaged), modified AMC Polarizer Salvaged VLA polarizer—modified: • 4.5 – 5 GHz only. • Cut-off flanges • Add new flanges • Add PAL coax adapters • Add PAL sq circ adapter EVLA Front-End CDR – C-Band Receiver April 24, 2006

  8. NRAO (wide-band) Production OMT EVLA Front-End CDR – C-Band Receiver April 24, 2006

  9. Dewar components 1 90 deg hybrid Cal Coupler Cal Splitter Cryo Isolator Cryo LNA ATM H915 ATM C115-0/MI ATM P215 DORADO 31CC60-1 NRAO: “C” LNA EVLA Front-End CDR – C-Band Receiver April 24, 2006

  10. Dewar components 2 SS Coax Re-formable Coax SMA Bulkhead RF-Connection SMA-M/SMA-M .141 AMP/TYCO 1054874-1 RF-COAX S086MMSS-22 EVLA Front-End CDR – C-Band Receiver April 24, 2006

  11. DEWAR PACKAGING 2 ZOTEFOAM WINDOW AC CONTROL BOX THERMAL GAP COLD PLATE (15K) AMC POLARIZER RF POST DEWAR BOX RAD SHIELD (50K) OMT ASSEMBLY SUPPORT ROD CTI 350 FRIG EVLA Front-End CDR – C-Band Receiver April 24, 2006

  12. RF Box Components Isolator BPF Post-amp Noise Source VLA SALVAGE/ MICA 604-S39 TTE K5221-4/8-G-A ALC ALS04--149 NORDEN N03-2086 EVLA Front-End CDR – C-Band Receiver April 24, 2006

  13. RF Box Packaging Space for Solar Cal Var Attn Digital control & Cal Drive PCB Noise Source Bandpass Filters Output Isolators Input Isolators EVLA Front-End CDR – C-Band Receiver April 24, 2006

  14. Common Dewar Design EVLA Front-End CDR – C-Band Receiver April 24, 2006

  15. DEWAR PACKAGING: THE COLD PLATE CHARCOAL CANISTER SS COAX OUT Au PLATED, OFC COLD PLATE LNA ISO CAL SPLITTER CAL COUP Al RAD SHIELD BOTTOM PLATE REFORM COAX IN EVLA Front-End CDR – C-Band Receiver April 24, 2006

  16. EVLA C-BANDNARROW-BAND PERFORMANCE Trx Trx spec = 16K, incl feed and radome • OTHER RESULTS: • SN R L • ================ • 14 15 • 15 18 • 19 14 EVLA Front-End CDR – C-Band Receiver April 24, 2006

  17. EVLA C-BANDWIDE-BAND PERFORMANCE • TEST CONDITIONS: • RCP LNA= 3-13 GHz, SN18, • not 4 – 8 GHz optomized. • Dewar cool (12/50 K) • SOIDA signal injected via cal port • (after the 4.5-5.0 GHz AMC pol) • .086 SS coax, 22 in long used to • inject test CW has 2+ dB loss, • not calibrated out. • Test demonstrates flatness, • not absolute Trx. Interim Freq Range. Actual Trx = 15 K. EVLA Front-End CDR – C-Band Receiver April 24, 2006

  18. EVLA C-BANDPreliminary Conclusions • Interim (4.6 – 5.1 GHz) receivers meet noise temp and amp/phase stability goals. • Full EVLA BW (4 – 8 GHz) tests show no BW limiting factors after polarizer. • Interim receiver production keeping pace with antenna refurbishment schedule. • EVLA full-bandwidth version awaits only the 4 – 8 GHz OMT design completion. • 4 – 8 GHz OMT design completion will follow 1 – 2 GHz OMT design evaluation (in-progress). • No technical or production problems anticipated. EVLA Front-End CDR – C-Band Receiver April 24, 2006

  19. Summary • M&S Budget - $237.3K already spent out of $603.0K allotment • Remaining large ticket items - Quad-ridge OMT’s - LNA’s - Cables - New Card Cages • Many of the significant components have already been ordered and received for the entire build with component prices at or below our original estimates. • To keep within the EVLA Project spend profile, it was felt that the upgraded design was low risk and that we could confidently proceed with mass production. • We hope the FE CDR Panel agrees with this action… EVLA Front-End CDR – C-Band Receiver April 24, 2006

More Related