We carry out 100-GHz band test observations with the newly-constructed KVN 21-m radio telescopes in order to evaluate their performance. The three telescopes have similar performance parameters. The pointing accuracies are about 4" rms for the entire sky. The main beam sizes are about 30" (FWHMs), which is nearly the diffraction limit of the telescopes at the observing frequency (97 GHz). The measured aperture and main-beam efficiencies are about 52% and 46%, respectively, for all three telescopes. The estimated moon efficiency is ~84% for the KVN Tamna telescope. The first sidelobes appear 50" (~1.6 xFWHM) from the main beam centers and the levels are on average -14 dB.

• Kee-Tae Kim(Korea Astronomy and Space Science Institute)
• Do-Young Byun(Korea Astronomy and Space Science Institute)
• Do-Heung Je(Korea Astronomy and Space Science Institute)
• Seog-Oh Wi(Korea Astronomy and Space Science Institute)
• Jae-Han Bae(Korea Astronomy and Space Science Institute)
• Tae-Hyun Jung(Korea Astronomy and Space Science Institute)
• Chang-Hoon Lee(Korea Astronomy and Space Science Institute)
• Seog-Tae Han(Korea Astronomy and Space Science Institute)
• Min-Gyu Song(Korea Astronomy and Space Science Institute)
• Jae-Hoon Jung(Korea Astronomy and Space Science Institute)
• Hyun-Soo Chung(Korea Astronomy and Space Science Institute)
• Hyo-Ryung Kim(Korea Astronomy and Space Science Institute)
• Bong Gyu Kim(Korea Astronomy and Space Science Institute)