The calibration of Very Long Baseline Interferometry (VLBI) data has long been a time consuming process. The Korean VLBI Network (KVN) is a simple array consisting of three identical antennas. Because four frequencies are observed simultaneously, phase solutions can be transferred from lower frequencies to higher frequencies in order to improve phase coherence and hence sensitivity at higher frequencies. Due to the homogeneous nature of the array, the KVN is also well suited for automatic calibration. In this paper we describe the automatic calibration of single-polarisation KVN data using the KVN Pipeline and comparing the results against VLBI data that has been manually reduced. We nd that the pipelined data using phase transfer produces better results than a manually reduced dataset not using the phase transfer. Additionally we compared the pipeline results with a manually reduced phase-transferred dataset and found the results to be identical.

Abstract
1. INTRODUCTION
2. OBSERVATIONS
3. VLBI DATA CALIBRATION
    3.1. Phase Calibration
    3.2. Amplitude Calibration
4. THE KVN PIPELINE
    4.1. IF-Aligner
    4.2. Frequency Phase Transfer
    4.3. General Operation
5. DISCUSSION
6. CONCLUSIONS
REFERENCES

• Jeffrey A. Hodgson(Korea Astronomy and Space Science Institute) Corresponding author
• Sang-Sung Lee(Korea Astronomy and Space Science Institute/University of Science and Technology)
• Guang-Yao Zhao(Korea Astronomy and Space Science Institute)
• Juan-Carlos Algaba(Korea Astronomy and Space Science Institute)
• Youngjoo Yun(Korea Astronomy and Space Science Institute)
• Taehyun Jung(Korea Astronomy and Space Science Institute)
• Do-Young Byun(Korea Astronomy and Space Science Institute/University of Science and Technology)