12meter system performance

07mar16

Parameters  




sband
xband
notes
freq
2270Mhz
8600 Mhz
used for pointing model
beamWid(Amin)
39.9'
10.1'
fwhm (from model3A)
sefd
4500 Jy

first guess from pointing
confusion limit(mJy)
151.8 mJy
3.8 mJy
.17mJy*bmWd(amin)^2*(frqGhz)^-.7
integration time to hit
confusion limit.
bandwid=172e6

6.3 secs
10228
xb assumes sefd also = 5000Jy
Tsys variation with elevation
20%
12%
more info
Tsys
107K
123K
  • from crosses on the moon
  • assuming appEff: .59,.63 .
  • Includes Tsys+Tatm (cloudy but no rain).
  • more info




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