Effective for period between Dec. 2006 - Jun. 2007 (Measured in Dec. 2006)
In Dec. 2006 we measured the beam size and the efficiencies only at 110 GHz and 115 GHz using S80 and S100.
The measured values for S80 were similar to those measured in 2004. However, the values for S100 became lower. This is due to possible difference in the position of optics caused when the SIS mixer was replaced in autumn 2006. From this result, it is thought that the beam sizes and the efficiencies are the same as those of 2001 in lower frequency bands (except S100).
Measured in Dec.2006
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Receiver Frequency HPBW Aperture Main beam Calib. EL. comment
(GHz) (arcsec) effic(%) effic(%) source
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S80 110 14.7+-0.1 29+-2 36+-3 Saturn 42-43
3C279 46-47
115 14.8+-0.2 21+-2 29+-2 Saturn 51-53
3C279 45-47
S100 110 14.8+-0.1 34+-3 42+-3 Saturn 42-43
3C279 46-47
115 14.5+-0.2 26+-2 34+-3 Saturn 51-53
3C279 45-47
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*The details of a measuring method are the same as the last year.
Refer to Antenna Efficiency(2001-2002) for the values in all frequency bands.