Feed Front End PDR Q Ka K

Feed & Front End PDR Q, Ka, K, Ku & X-Band Receivers Backup Slides Bob Hayward Receiver Engineer Feed & Front End PDR 12 -13 Feb 2002 1

TRx Estimates VLBA vs. EVLA Comparison Receiver VLBA TRx ( K) EVLA TRx ( K) Q Ka 56 - 44 38 K Ku X C S L 61 34 35 24 13 17 28 21 21 16 11 9 Bob Hayward Receiver Engineer Feed & Front End PDR 12 -13 Feb 2002 2

EVLA Receiver Prototype Schedule Modify Antennas Prototype Prototype K-Band Q-Band C-Band U-Band L-Band X-Band S-Band A-Band ----------------------------------------| 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | |--------+--------+--------+--------+----| | | | >--1 -7 --->--8 -14 -->-15 -21 -->-22 -28 --> | | | |--------> | | | | | >--------> | | | | | >-------> | | | | | >--------> | | | | | |--------+--------+--------+--------+----| | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | ---------------------------------------- Bob Hayward Receiver Engineer Feed & Front End PDR 12 -13 Feb 2002 3

EVLA Receiver Production Schedule Modify Antennas Build/Install K Build/Install Q Build/Install C Build/Install U Build/Install L Build/Install X Build/Install S Build/Install A No. of Upgraded No. of New Rx’s Total per year ----------------------------------------| 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | |--------+--------+--------+--------+----| | | >--1 -7 --->--8 -14 -->-15 -21 -->-22 -28 --> | | | | >-2 ->---7 ---->---7 ---->---7 ---->---7 ----> | | | | | >---7 ---->---7 ---->---7 ---->---7 ---->-2 -> | | | | | | >-1 ->---3 ---->---3 ---->---8 ---->----8 --->----7 ---> | | | | | >---3 ---->---7 ---->----9 --->----8 ---> |--------+--------+--------+--------+----| | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | --------+--------+--------+--------+-------Rx’s 4 14 14 0 0 14 16 26 26 34 36 30 ------------6 30 32 40 40 34 34 30 Bob Hayward Receiver Engineer Feed & Front End PDR 12 -13 Feb 2002 4

EVLA Amplifier Production Schedule ----------------------------------------| 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | |--------+--------+--------+--------+----| Antennas | | >--1 -7 --->--8 -14 -->-15 -21 -->-22 -28 --> | | | | K-Amps | | |2 2 2 | | Q-Amps | | |2 2 2 2 | | | | C-Amps | |P 4 4 |4 4 4 4 | | U-Amps | |P 4 4 |4 4 4 4 | | | | L-Amps | | |P 4 2 |2 2 2 |4 4 4 4 |4 4 | X-Amps | | |P 4 2 |2 2 2 |4 4 4 4 |4 4 | | | S-Amps | |P 4 2 |2 2 2 |4 4 4 4 | A-Amps | |P 4 2 |2 2 2 |4 4 4 4 | |--------+--------+--------+--------+----| | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | --------+--------+--------+--------+-------Prototypes 0 8 8 8 0 0 0 Production 0 8 50 62 70 82 64 64 64 --------------Total/year 0 16 58 70 70 82 64 64 64 Bob Hayward Receiver Engineer Feed & Front End PDR 12 -13 Feb 2002 Subtotal ----= 24 = 32 = 72 = 72 488 5

What can we Scavenge from the Old A&F-Racks? • Nope: • LNA’s, Filters, Post Amps, Model 1020 Fridge • Maybe: • Noise Diodes & Couplers (Noise Diode for K / Ku Spec’d for 14. 4 -24. 0 GHz) • Hopefully: • Various Switches Bob Hayward Receiver Engineer Feed & Front End PDR 12 -13 Feb 2002 6

Gain/Phase Stability Improvement • Calibration Noise Sources: • Constant Current Circuits • Temperature Coefficient typically 0. 01 d. B/ C (~1% change in TCal for a 5 C temperature change) • Thermally Lagged and/or Temperature Stabilization • Post Amps: • Temperature Stabilization • IF/LO Cabling: • Improved rigidity & support of heliax cables Bob Hayward Receiver Engineer Feed & Front End PDR 12 -13 Feb 2002 7

Transition Old Rx’s on New Antennas • Current K-Band VLA receiver will not work on modified EVLA antennas • Incompatible IF’s bands (4. 0 -4. 5 vs. 8 -12 GHz) • Current Q-Band would work with a kludge • IF system limited to 7. 7 -9. 1 GHz • Ku-Band will have an Up-Converter (LO/IF) • This “Interim” unit later built into new Ku-Band Rx Bob Hayward Receiver Engineer Feed & Front End PDR 12 -13 Feb 2002 8

Transition New Rx’s on Old Antennas • New Q, Ka, K, Ku receivers will not work on unmodified antennas: • Incompatible LO Reference Frequencies – F 3 (16 -20 GHz) vs. new 1 st LO (12 -20 GHz) will not cover entire range of new Ka, K & Ku-Bands • IF Power Levels (no IF amp in new receivers) Bob Hayward Receiver Engineer Feed & Front End PDR 12 -13 Feb 2002 9

Quiet Sun Amplifier Compression (Level : OK ; above 1% ; above 1 d. B) LNA (Po=-10 d. Bm) Post (Po=+10 d. Bm) 3 rd Amp Tn K G d. B P d. Bm NF d. B G d. B P d. Bm Rx BW GHz Tsky 1000 K L 1 100 2 25 -34. 1 . 03 25 -9. 1 20 10. 9 S 2 70 4 40 -18. 1 2 25 6. 9 - - C 4 30 8 40 -18. 1 2 25 6. 2 - - X 4 20 10 40 -20. 6 2 25 4. 4 - - Ku 6 10 10 40 -21. 8 3 25 3. 2 - - K 8 9 15 35 -26. 0 4 25 -1. 0 - - Ka 13 6 20 35 -25. 7 5 25 -0. 7 - - Q 17 6 35 35 -24. 5 5 25 0. 5 - - Bob Hayward Receiver Engineer Feed & Front End PDR 12 -13 Feb 2002 10

Active Sun (10 x Quiet) Amplifier Compression (Level : OK ; above 1% ; above 1 d. B) LNA (Po=-10 d. Bm) Post (Po=10 d. Bm) 3 rd Amp Tn K G d. B P d. Bm NF d. B G d. B P d. Bm Rx BW GHz Tsky 1000 K L 1 1000 2 25 -24. 1 . 03 25 0. 9 20 20. 9 S 2 700 4 40 -8. 1 2 25 16. 9 - - C 4 300 8 40 -8. 8 2 25 16. 2 - - X 4 200 10 40 -10. 6 2 25 14. 4 - - Ku 6 100 10 40 -11. 8 3 25 13. 2 - - K 8 90 15 35 -16. 0 4 25 9. 0 - - Ka 13 60 20 35 -15. 7 5 25 9. 3 - - Q 17 60 35 35 -14. 5 5 25 10. 5 - - Bob Hayward Receiver Engineer Feed & Front End PDR 12 -13 Feb 2002 11

Front End Group Test Equipment • Vector Network Analyzer (0. 01 -26. 5 GHz) • Scalar Network Analyzer (0. 01 -26. 5 GHz) • Waveguide Source Modules (Ka, Q & W-Band) • Spectrum Analyzer (0. 01 -26. 5 GHz) • Waveguide Harmonic mixers for Ka, Q and W-Band • High Dynamic Range Power Meter • Sensors covering DC-110 GHz Bob Hayward Receiver Engineer Feed & Front End PDR 12 -13 Feb 2002 12

Automated Receiver Test Systems • SOIDA • • • - 2 Synthesizers + Down Converter - Power Meter + Cal Switch Driver - PC Controlled using Quick Basic Automated Measurement of TRx , Tcal and SCal Have 2 “old-style” SOIDA systems now (largely obsolete) Will need 2 “new-generation” systems to meet production schedule ( $100 K each) Need new low reflection Hot/Cold loads for L, S, C, X & Ku Use CV-3 absorber for Hot & Cold (dipped in LN 2) Loads for K, Ka & Q Bob Hayward Receiver Engineer Feed & Front End PDR 12 -13 Feb 2002 13

Lab Polarization Measurements at Q-Band Bob Hayward Receiver Engineer Feed & Front End PDR 12 -13 Feb 2002 14

C-Band Noise Budget Temp (K) L/G (d. B) TRx (K) Feed 300 -0. 05 3. 474 Vacuum Window 300 -0. 001 0. 069 OMT 50 -0. 1 1. 165 Hybrid 18 -0. 2 0. 848 Cal Coupler 18 -0. 2 0. 848 Tn = 8 +40 9. 082 Cold SS Coax 150 -2 0. 010 Warm Coax 300 -0. 5 0. 007 NF=2 d. B +25 0. 035 Splitter 300 -4 0. 000 Mixer 300 -10 0. 004 IF Cable 300 -3 0. 005 Component LNA Post Amp Total TRx Bob Hayward Receiver Engineer Cooled Isolator (0. 5 d. B) add 3. 31 K 11. 01 Feed & Front End PDR 12 -13 Feb 2002 15

S-Band Noise Budget Temp (K) L/G (d. B) TRx (K) Feed 300 -0. 05 3. 474 Vacuum Window 300 -0. 001 0. 069 OMT 50 -0. 1 1. 165 Hybrid 18 -0. 2 0. 848 Cal Coupler 18 -0. 2 0. 848 Tn = 4 +40 4. 541 Cold SS Coax 150 -2 0. 010 Warm Coax 300 -0. 5 0. 007 NF=2 d. B +25 0. 035 Splitter 300 -4 0. 000 Mixer 300 -10 0. 004 IF Cable 300 -3 0. 005 Component LNA Post Amp Total TRx Bob Hayward Receiver Engineer Cooled Isolator (0. 5 d. B) add 2. 75 K 11. 01 Feed & Front End PDR 12 -13 Feb 2002 16

L-Band Noise Budget Temp (K) L/G (d. B) TRx (K) Feed 300 -0. 05 3. 474 Vacuum Window 300 -0. 001 0. 069 OMT 50 -0. 1 1. 165 Hybrid 18 -0. 2 0. 848 Cal Coupler 18 -0. 5 0. 848 Tn = 2 +25 2. 271 18 -3 0. 64 Tn = 4 +25 0. 029 Coax 150 & 300 -2 & -0. 5 0. 003 Post Amp NF=2 d. B +25 0. 007 Splitter 300 -4 0. 000 Mixer 300 -10 0. 001 Component LNA – 1 st G-Block Cooled Filter LNA – 2 nd G-Block Total TRx Bob Hayward Receiver Engineer Cooled Isolator (0. 5 d. B) add 2. 49 K 8. 78 Feed & Front End PDR 12 -13 Feb 2002 17