2013
DOI: 10.1086/671125
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Korean VLBI Network Receiver Optics for Simultaneous Multifrequency Observation: Evaluation

Abstract: We have developed a new millimeter wave receiver system with input optics that support simultaneous observations in four bands of 22, 43, 86, and 129 GHz to facilitate calibrating tropospheric phase fluctuations for millimeter-wave VLBI observations. In order to make simultaneous observations in four bands pointing at the same position in sky, it is crucial that errors among the beams from any misalignments should be kept small. After doing the beam alignment in the laboratory, on-site test observations were … Show more

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Cited by 51 publications
(28 citation statements)
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“…The antenna pointing and focus were checked approximately every 2 -3 hours by observing nearby strong SiO maser sources. For the front end, the cryogenic 22, 43, and 86 GHz High Electron Mobility Transistor (HEMT) receivers and the Superconductor-InsulatorSuperconductor (SIS) 129 GHz receiver were used with both right and left circular polarized (RCP and LCP) feeds (Han et al 2013). During our observations, we adopted only one side circular polarized feed, LCP, to obtain a uniform data set.…”
Section: Source Selection and Observationsmentioning
confidence: 99%
“…The antenna pointing and focus were checked approximately every 2 -3 hours by observing nearby strong SiO maser sources. For the front end, the cryogenic 22, 43, and 86 GHz High Electron Mobility Transistor (HEMT) receivers and the Superconductor-InsulatorSuperconductor (SIS) 129 GHz receiver were used with both right and left circular polarized (RCP and LCP) feeds (Han et al 2013). During our observations, we adopted only one side circular polarized feed, LCP, to obtain a uniform data set.…”
Section: Source Selection and Observationsmentioning
confidence: 99%
“…Top view of the simultaneous multi-frequency receiver system installed at the receiver cabin of KVN Yonsei antenna. The 4-frequency receivers (22,43,86,and 129 GHz) are installed on the receiver plate with quasi-optical mirrors and three low pass filters, which divide the signal from the subreflector to the appropriate receiver (Han et al 2013).…”
Section: Measuring the Core Shift Effect With Global Baselinesmentioning
confidence: 99%
“…The multi-frequency receiver system of KVN (Han et al 2008(Han et al , 2013) is designed for atmospheric compensation using simultaneous observations at multiple frequencies, which results in an effective increase of the coherence time, well beyond that imposed by atmospheric propagation (Figure 2) and its performance was proved for the first time by Jung (2011). The KVN backend, combined with the Source Frequency Phase Referencing (SFPR) data analysis technique (Dodson & Rioja 2009;Rioja et al , 2014Rioja et al , 2015, allows high precision astrometric measurements even at the highest frequencies.…”
Section: Simultaneous Multi-frequency Receiver System In Mm-vlbi Obsementioning
confidence: 99%
“…The baseline lengths between the antennas range between 300 and 500 km, which provide a spatial resolution ∼1 mas at the highest frequency band. The innovative multi-band receiver [4,5] of KVN is designed to mitigate the atmospheric propagation effects using simultaneous observations at multiple bands. The KVN combined with the Frequency Phase Transfer (FPT) and Source Frequency Phase Referencing (SFPR) data analysis techniques ( [6][7][8][9] see also references therein) allows an effective increase of the coherence time, well beyond that imposed by tropospheric fluctuations, as well as high precision astrometric measurements, respectively, even at the highest frequencies.…”
Section: Introductionmentioning
confidence: 99%