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Single dish performance of KVN 21-m radio telescopes:Simultaneous observations at 22 and 43 GHz | | Sang-Sung Lee
; Do-Young Byun
; Chung Sik Oh
; Seog-Tae Han
; Do-Heung Je
; Kee-Tae Kim
; Seog-Oh Wi
; Se-Hyung Cho
; Bong Won Sohn
; Jaeheon Kim
; Jeewon Lee
; Se-Jin Oh
; Min-Gyu Song
; Jiman Kang
; Moon-Hee Jung
; Jeong Ae Lee
; Junghwan Oh
; Jae-Han Bae
; So-Young Yun
; Jung-Won Lee
; Bong Gyu Kim
; Hyunsoo Chung
; Duk-Gyoo Roh
; Chang Hoon Lee
; Hyun Goo Kim
; Hyo Ryoung Kim
; Jae-Hwan Yeom
; Tomoharu Kurayama
; Taehyun Jung
; Pulun Park
; Min Joong Kim
; Dong-Hwan Yoon
; Won-Ju Kim
; | | Date: |
18 Oct 2011 | | Abstract: | We report simultaneous multi-frequency observing performance at 22 and 43 GHz
of the 21-m shaped-Cassegrain radio telescopes of the Korean VLBI Network
(KVN). KVN is the first millimeter-dedicated VLBI network in Korea having a
maximum baseline length of 480 km. It currently operates at 22 and 43 GHz and
planed to operate in four frequency bands, 22, 43, 86, and 129 GHz. The unique
quasioptics of KVN enable simultaneous multi-frequency observations based on
efficient beam filtering and accuarate antenna-beam alignment at 22 and 43 GHz.
We found that the offset of the beams is within <5 arcseconds over all pointing
directions of antenna. The dual polarization, cooled HEMT receivers at 22 and
43 GHz result in receiver noise temperatures less than 40 K at 21.25-23.25 GHz
and 80 K at 42.11-44.11 GHz. The pointing accuracies have been measured to be 3
arcseconds in azimuth and elevation for all antennas. The measured aperture
efficiencies are 65%(K)/67%(Q), 62%(K)/59%(Q), and 66%(K)/60%(Q) for the three
KVN antennas, KVNYS, KVNUS, and KVNTN, respectively. The main-beam efficiencies
are measured to be 50%(K)/52%(Q), 48%(K)/50%(Q), and 50%(K)/47%(Q) for KVNYS,
KVNUS, and KVNTN, respectively. The estimated Moon efficiencies are
77%(K)/90%(Q), 74%(K)/79%(Q), and 80%(K)/86%(Q) for KVNYS, KVNUS, KVNTN,
respectively. The elevation dependence of the aperture efficiencies is quite
flat for elevations > 20 degrees. | | Source: | arXiv, 1110.3881 | | Services: | Forum | Review | PDF | Favorites | |
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