Fact Sheet for the 230 GHz Band

• This version of the receiver has been installed in the telescope since November 1996.
• Single channel SIS receiver operating in DSB mode.
• Frequency coverage 210 to 265 GHz. It can be tuned up to 275 GHz but with poor performance.
• Predicted zenith system temperatures at 230 GHz. The CSO tau meter gives the zenith opacity at 225 GHz (t_225).

  	t_225<0.05	0.05<t_225<0.1	0.1<t_225<0.2	t_225<0.5
  Tsys	<300	300-350	350-450	<800

• Efficiencies

  eta_beam	0.79 - 5.5 10-3 (f[GHz]-200) + 3.9 10-5 (f[GHz]-200)2 +/- 0.04
  eta_l	0.91 +/- 0.01
  eta_fss	0.80 +/- 0.05
  eta_A	0.78 eta_beam
  HPBW (arcsec)	19.52 (245.0 / f[GHz]) + 0.47 cos(0.2428*f[GHz]+3.6064) +/- 0.5

Next revision before August 1, 1997.