Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
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PERFORMANCE OF THE SRAO 6-METER RADIO TELESCOPE

  • KOO BON-CHUL (Astronomy Program, SEES, Seoul National University) ;
  • PARK YONG-SUN (Astronomy Program, SEES, Seoul National University) ;
  • HONG SEUNG SOO (Astronomy Program, SEES, Seoul National University) ;
  • YUN HONG-SIK (Astronomy Program, SEES, Seoul National University) ;
  • LEE SANG-GAK (Astronomy Program, SEES, Seoul National University) ;
  • BYUN DO-YOUNG (Astronomy Program, SEES, Seoul National University) ;
  • LEE JUNG-WON (Astronomy Program, SEES, Seoul National University) ;
  • CHOI HAN-KyU (Astronomy Program, SEES, Seoul National University) ;
  • LEE SANG-SUNG (Astronomy Program, SEES, Seoul National University) ;
  • YOON YOUNG-ZOO (Astronomy Program, SEES, Seoul National University) ;
  • KIM KEE-TAE (Astronomy Program, SEES, Seoul National University) ;
  • KANG HYUN WOO (Astronomy Program, SEES, Seoul National University) ;
  • LEE JUNG-EuN (Astronomy Program, SEES, Seoul National University)
  • Published : 2003.03.01
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Abstract

We introduce and describe performance of the 6-meter telescope of Seoul Radio Astronomy Observatory (SRAO). All the softwares and instruments except the antenna structure and its driving system are developed for ourselves. The SIS mixer type receiver resulted in the receiver noise temperature less than 50 K (DSB) over the whole 3-mm radio window. An autocorrelation spectrometer, developed first in Korea, provides maximum 50 MHz band width over 1024 channels. Antenna surface is measured and adjusted using template method and radio holography which resulted in a superb surface accuracy bet-ter than 30${\mu}m$. Accordingly, the aperture and beam efficiences amount to $70\%$ and $75\%$, respectively, largely independent of frequency in the 85 - 115 GHz range. It is also found that telescope pointing errors are less than 10" in both azimuth and elevation and that antenna gain is almost constant against elevation greater than $20^{\circ}$, without adjusting sub-reflector position. The SRAO 6-meter telescope is now fully operational and all these characteristics verify that observations are carried out with high precision and fidelity.

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References

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