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EVLA Front-End CDR

EVLA Front-End CDR. EVLA Low Frequency Receiver Capability. Low Band Overview. P-Band 4-Band 2-Band 4-P Converter. P Band. 310-344 MHz, 2 channel VLA P-band Receiver (legacy) Custom cross-dipole, NRAO design, near prime focus—At 290 K.

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EVLA Front-End CDR

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  1. EVLA Front-End CDR EVLA Low Frequency Receiver Capability EVLA Front-End CDR – Low Frequency Receivers April 24, 2006

  2. Low Band Overview • P-Band • 4-Band • 2-Band • 4-P Converter EVLA Front-End CDR – Low Frequency Receivers April 24, 2006

  3. P Band 310-344 MHz, 2 channel VLA P-band Receiver (legacy) Custom cross-dipole, NRAO design, near prime focus—At 290 K. Commercial wide-band hybrid, quadrature phase shifter—At 290 K. Cal coupler—At 290 K Cal source, NoiseCom/MC63147– At 290 K. LNA, NRAO design—At 290 K, Te=28 K, G=33 dB 2 outputs at 310 - 344 MHz, -35 dBm Cryogenics: None. Receiver FE NF est=55 K EVLA Front-End CDR – Low Frequency Receivers April 24, 2006

  4. 73-75 MHz, 2 channel VLA 4-band Receiver (legacy) Custom cross-dipole, NRL design, near prime focus—At 290 K. Commercial wide-band hybrid, quadrature phase shifter—At 290 K. Cal coupler—At 290 K Cal source, NoiseCom/MC63147– At 290 K. 4 Band EVLA Front-End CDR – Low Frequency Receivers April 24, 2006

  5. SAO 2 Band • 196 MHz, 290 K, Feed at Prime Focus • Preliminary receivers were tested on five VLA antennas. • Currently being redesigned.   • Any questions, contact: Lincoln Greenhill Smithsonian Astrophysical Observatory 60 Garden St, Cambridge, MA 02138 EVLA Front-End CDR – Low Frequency Receivers April 24, 2006

  6. 4-P Converter LCP P RCP LCP 4 RCP Note: EVLA uses dedicated inputs for both bands. EVLA Front-End CDR – Low Frequency Receivers April 24, 2006

  7. Summary • Low Band Front Ends are legacy hardware • No schedule/cost impact to EVLA • 4-P Converter is new • 2-Band information included for completeness only, I.E. we are aware EVLA Front-End CDR – Low Frequency Receivers April 24, 2006

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