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

Bob Hayward Receiver Engineer Feed & Front End PDR Feb T Rx Estimates VLBA vs. EVLA Comparison Receiver VLBA T Rx (  K)EVLA T Rx (  K) Q 5644 Ka - 38 K 6128 Ku 3421 X 3521 C 2416 S 1311 L 179

Bob Hayward Receiver Engineer Feed & Front End PDR Feb EVLA Receiver Prototype Schedule | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | | | | | | | | | | | | | Modify Antennas | | > > > > > | | | | | | | | | | | | | Prototype K-Band | > | | | | | | | | Prototype Q-Band | > | | | | | | | | Prototype C-Band | > > | | | | | | | | Prototype U-Band | > > | | | | | | | | Prototype L-Band | | > > | | | | | | | Prototype X-Band | | > > | | | | | | | Prototype S-Band | | | > > | | | | | | Prototype A-Band | | | > > | | | | | | | | | | | | | | | | | | | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |

Bob Hayward Receiver Engineer Feed & Front End PDR Feb EVLA Receiver Production Schedule | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | | | Modify Antennas | | > > > > > | | | | | | | | | | | | | Build/Install K | | >-2-> > > > > | | | Build/Install Q | | >-2-> > > > > | | | | | | | | | | | | | Build/Install C | | > > > > >-2-> | | | Build/Install U | | > > > > >-2-> | | | | | | | | | | | | | Build/Install L | | | | >-1-> > > > > > Build/Install X | | | | >-1-> > > > > > | | | | | | | | | | Build/Install S | | | | > > > > > > Build/Install A | | | | > > > > > > | | | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | No. of Upgraded Rx’s No. of New Rx’s Total per year

Bob Hayward Receiver Engineer Feed & Front End PDR Feb EVLA Amplifier Production Schedule | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | | | Sub- Antennas | | > > > > > | | | total | | | | | | | | | | K-Amps | | |2 2 2 |2 2 2 |2 2 2 |2 2 2 | | | | = 24 Q-Amps | | | | | | | | | | = 32 | | | | | | | | | | C-Amps | |P4 4 | | | | | | | | = 72 U-Amps | |P4 4 | | | | | | | | = 72 | | | | | | | | | | L-Amps | | |P4 2 |2 2 2 |2 2 2 |2 2 2 | | | | = 72 X-Amps | | |P4 2 |2 2 2 |2 2 2 |2 2 2 | | | | = 72 | | | | | | | | | | S-Amps | | | |P4 2 |2 2 2 |4 4 4 | | | | = 72 A-Amps | | | |P4 2 |2 2 2 |4 4 4 | | | | = 72 | | | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | Prototypes Production Total/year

Bob Hayward Receiver Engineer Feed & Front End PDR Feb 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 GHz) Hopefully: Various Switches

Bob Hayward Receiver Engineer Feed & Front End PDR Feb Gain/Phase Stability Improvement Calibration Noise Sources: Constant Current Circuits Temperature Coefficient typically 0.01 dB/  C (~1% change in T Cal 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 Feb Transition Old Rx’s on New Antennas Current K-Band VLA receiver will not work on modified EVLA antennas Incompatible IF’s bands ( vs GHz) Current Q-Band would work with a kludge IF system limited to 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 Feb Transition New Rx’s on Old Antennas New Q, Ka, K, Ku receivers will not work on unmodified antennas: Incompatible LO Reference Frequencies –F3 (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 Feb Quiet Sun Amplifier Compression (Level : OK ; above 1% ; above 1 dB) Rx BW GHz Tsky 1000  K LNA (P o =-10dBm)Post (P o =+10dBm)3 rd Amp Tn  K G dB P dBm NF dB G dB P dBm G dB P dBm L S C X Ku K Ka Q

Bob Hayward Receiver Engineer Feed & Front End PDR Feb Active Sun (10 x Quiet) Amplifier Compression (Level : OK ; above 1% ; above 1 dB) Rx BW GHz Tsky 1000  K LNA (P o =-10dBm)Post (P o =10dBm)3 rd Amp Tn  K G dB P dBm NF dB G dB P dBm G dB P dBm L S C X Ku K Ka Q

Bob Hayward Receiver Engineer Feed & Front End PDR Feb Front End Group Test Equipment Vector Network Analyzer ( GHz) Scalar Network Analyzer ( GHz) Waveguide Source Modules (Ka, Q & W-Band) Spectrum Analyzer ( 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 Feb Automated Receiver Test Systems SOIDA- 2 Synthesizers + Down Converter - Power Meter + Cal Switch Driver - PC Controlled using Quick Basic Automated Measurement of T Rx, T cal and S Cal Have 2 “old-style” SOIDA systems now (largely obsolete) Will need 2 “new-generation” systems to meet production schedule (  $100K each) Need new low reflection Hot/Cold loads for L,S,C,X & Ku Use CV-3 absorber for Hot & Cold (dipped in LN2) Loads for K, Ka & Q

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

Bob Hayward Receiver Engineer Feed & Front End PDR Feb ComponentTemp (K)L/G (dB)  T Rx (K) Feed Vacuum Window OMT Hybrid Cal Coupler LNATn = Cold SS Coax Warm Coax Post AmpNF=2 dB Splitter Mixer IF Cable Total T Rx C-Band Noise Budget Cooled Isolator (0.5 dB) add 3.31  K

Bob Hayward Receiver Engineer Feed & Front End PDR Feb ComponentTemp (K)L/G (dB)  T Rx (K) Feed Vacuum Window OMT Hybrid Cal Coupler LNATn = Cold SS Coax Warm Coax Post AmpNF=2 dB Splitter Mixer IF Cable Total T Rx S-Band Noise Budget Cooled Isolator (0.5 dB) add 2.75  K

Bob Hayward Receiver Engineer Feed & Front End PDR Feb ComponentTemp (K)L/G (dB)  T Rx (K) Feed Vacuum Window OMT Hybrid Cal Coupler LNA – 1 st G-BlockTn = Cooled Filter LNA – 2 nd G-BlockTn = Coax150 & & Post AmpNF=2 dB Splitter Mixer Total T Rx 8.78 L-Band Noise Budget Cooled Isolator (0.5 dB) add 2.49  K