The Interferometric Monitoring of Gamma–ray Bright Active galactic nuclei (iMOGABA) program provides not only simultaneous multifrequency observations of bright gamma–ray detected active galactic nuclei (AGN), but also covers the highest Very Large Baseline Interferometry (VLBI) frequencies ever being systematically monitored, up to 129 GHz. However, observation and imaging of weak sources at the highest observed frequencies is very challenging. In the second paper in this series, we evaluate the viability of the frequency phase transfer technique to iMOGABA in order to obtain larger coherence time at the higher frequencies of this program (86 and 129 GHz) and image additional sources that were not detected using standard techniques. We find that this method is applicable to the iMOGABA program even under non–optimal weather conditions.

Abstract
1. INTRODUCTION
2. FREQUENCY PHASE TRANSFER
    2.1. Background
    2.2. Method
3. OBSERVATIONS AND DATA REDUCTION
4. RESULTS
    4.1. iMOGABA9
    4.2. iMOGABA15
5. DISCUSSION
REFERENCES

• Juan-Carlos Algaba(Korea Astronomy and Space Science Institute) Corresponding author
• Guang-Yao Zhao(Korea Astronomy and Space Science Institute)
• Sang-Sung Lee(Korea Astronomy and Space Science Institute/Korea University of Science and Technology)
• Do-Young Byun(Korea Astronomy and Space Science Institute)
• Sin-Cheol Kang(Korea Astronomy and Space Science Institute/Korea University of Science and Technology)
• Dae-Won Kim(Department of Physics and Astronomy, Seoul National University)
• Jae-Young Kim(Department of Physics and Astronomy, Seoul National University)
• Jeong-Sook Kim(National Astronomical Observatory of Japan)
• Soon-Wook Kim(Korea Astronomy and Space Science Institute/Korea University of Science and Technology)
• Motoki Kino(Korea Astronomy and Space Science Institute)
• Atsushi Miyazaki(Korea Astronomy and Space Science Institute/Faculty of Science and Engineering, Hosei University)
• Jong-Ho Park(Department of Physics and Astronomy, Seoul National University)
• Sascha Trippe(Department of Physics and Astronomy, Seoul National University)
• Kiyoaki Wajima(Korea Astronomy and Space Science Institute)