Operating band: 203.4 -- 250 GHz. Between 203 and 245 GHz, the SSB receiver temperature is 100 -- 180 K in the standard reference plane.
This receiver has been equipped with a new mixer in February 1994.
The SSB receiver temperature over the nominal tuning range (210--250 GHz) is
100--130 K in the standard reference plane. The upper side band can be rejected by typically 
dB over this range. This receiver can be tuned to 267 GHz, although with a higher noise temperature (
K).
See the March 1994 Newsletter
for more details.
The two 1.3 mm receivers and the 3 mm SIS receiver can be used simultaneously. Beware, however, of possible interference of 230G2's LO into the 3 mm receiver. The 230G2 receiver cannot be operated with the 2 mm receiver, since both receivers use the same control box. Switching from one receiver to the other is not straightforward and will not be made upon request in real time. Please specify in the proposal form whether you choose to use the 2 mm receiver or 230G2.
At 1.3 mm (and a fortiori at shorter wavelengths) a large
fraction of the receiver radiation pattern is distributed in an error
beam (which can be approximated by two Gaussians of HPW 
and 
--- see A&A 274, p.144-146 for more details).
Astronomers should take into account this error beam when converting
antenna temperatures into brightness temperatures.