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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.

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EVLA Front-End CDR

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  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

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