CSO Heterodyne Receiver Beam Efficiency Measurements on Mars
Mirrors Alligned March 26 - April 2, 2001
Related Memo's:

J.W. Kooi

Adapted from Walt Schaal



230 GHz Receiver Beam

   

  • FWHM Beam Size on Mars: 33.4"   (Same for 3/01 and 3/99)
  • De-Convolved Rx Beam: 32.5"
  • Calulated FWHM Beam Size: 30.3" x 30.7"
  • Secondary Edgetaper: 8.5 dB (Limited by telescope optics)
  • Beam Effieciency: 69.8% (32.5" FWHM beam from 3/01)
  • Mars Dia=10.0", Tmars=204K*, Ta*= 18.1K, March 30, 2001
  • Mars Dia=13.8", Tmars=208K*, Ta*= 33.5K, March 30, 1999

  • 345 GHz Receiver Beam

       

  • FWHM Beam Size: 24.6"   (from 3/99)
  • De-Convolved Rx Beam: 24.4"
  • Calulated FWHM Beam Size: 22.3" x 21.5"
  • Secondary Edgetaper: 15.1 dB
  • Beam Effieciency: 74.6% (3/31/2001)
  • Mars Dia=10.1", Tmars=204K*, Ta*= 17.2K, March 31, 2001
  • Mars Dia=13.8", Tmars=208K*, Ta*= 62K, March 31, 1999

  • 460 GHz Receiver Beam

       

  • FWHM Beam Size: 17"   (From June 20, 1999)
  • De-Convolved Rx Beam: 16.5"
  • Calulated FWHM Beam Size: 14.4" x 14.7"
  • Secondary Edgetaper: 10.1 dB
  • Beam Effieciency: 50-53% (16.5" FWHM beam on 3/99)
  • Mars Dia=12.4", Tmars=212K*, Ta*= K, June 20, 1999

  • 690 GHz Receiver Beam


  • FWHM Beam Size: 14.5"
  • De-Convolved Rx Beam: 9.85"
  • Calulated FWHM Beam Size: 10.5" x 10.7"
  • Secondary Edgetaper: 13.2 dB
  • Mars Dia=13.8", Tmars=215K*, March 31, 1999

  • 806 GHz Receiver Beam

       

  • FWHM Beam Size: ~13.5" (Tsys was 15000 Kelvin, noisy data)
  • De-Convolved Rx Beam: 11.5"
  • Calulated FWHM Beam Size: 9.0" x 8.9"
  • Secondary Edgetaper: 11.3 dB
  • Beam Effieciency: ~28% (with a 11.5" FWHM beam size)
  • Mars Dia=10.15", Tmars=204K, Ta*=47K on March 31, 2001

  • References

     
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    Web Page created and last updated on Nov. 22, 2002, by: Jacob W. Kooi