This paper presents the results of test observations toward a point source, 4C39.25, for observation modes with various bandwidths and numbers of IF streams in order to examine a reliability of the Daejeon hardware correlator performance for correlating VLBI (Very Long Baseline Interferometry) data obtained with the several observation modes of the KVN (Korean VLBI Network). We used a DiFX software correlator (DiFX) as a reference, for investigating the output visibilities from the Daejeon corelator. It is found that the band shapes of the output visibilities from two correlators are similar to each other and the correlated flux density for each baseline obtained from the Daejeon hardware correlator is lower by 3 - 7% than that from the DiFX. The flux difference is attributed to the limitation of FPGA resources and the difference of fringe rotation algorithm of the Daejeon hardware correlator. The conversion factor, 0.93 ~ 0.97, is proposed for future correlation with the Daejeon hardware correlator.

ABSTRACT
1. 서론
2. 대전상관기의 구성
3. 관측모드
4. 실험 및 결과
    4.1. 관측모드별 비교
    4.2. 진폭 플럭스 비교
5. 결론
REFERENCES

• 오세진(한국천문연구원) | SE-JIN OH (Korea Astronomy and Space Science Institute)
• 노덕규(한국천문연구원) | DUK-GYOO ROH (Korea Astronomy and Space Science Institute)
• 염재환(한국천문연구원) | JAE-HWAN YEOM (Korea Astronomy and Space Science Institute)
• 오충식(한국천문연구원) | CHUNG-SIK OH (Korea Astronomy and Space Science Institute)
• 이상성(한국천문연구원) | SANG-SUNG LEE (Korea Astronomy and Space Science Institute)
• 정동규(한국천문연구원) | DONG-KYU JUNG (Korea Astronomy and Space Science Institute)
• 김효령(한국천문연구원) | HYO-RYOUNG KIM (Korea Astronomy and Space Science Institute)
• 정현수(한국천문연구원) | HYUN-SOO CHUNG (Korea Astronomy and Space Science Institute)