Following table shows measurements of main-beam size, aperture efficiency and main-beam effciency at 22.235, 43.122, 86.243 and 129.363GHz bewteen 2013 September and 2014 January. Jupiter was used for 22GHz and 43GHz, and Mars was used for the other higher frequencies.
|Site||Band (GHz)||HPBW (arcsec)||Aperture Efficiency (%)||Beam Efficiency (%)|
Aperture efficiency varies with elevation. The elevation dependency of KVN antannas represented as gain curve is described in next section. Those in the above table are the maximum values.
Beam efficiency varies with beam size. The measured HPBWs are tabulated in the above table, which are almost the same as the theoretical ones(= wavelength / diameter of antenna). In order to get a beam efficiency at 90 GHz, you have to multiply (86/90)2 to that at 86 GHz.
In case you are reducing single-dish spectrum data, you need to multifly a factor of 1.25 before applying efficiency corrections. This is to compensate for the effect of the digital filter and spectrometer.
The above table can be applied for the following observing season.
- KVN-YS : from AUG 2013 - now
- KVN-US : from AUG 2013 - now
- KVN-TN : from AUG 2013 - now