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New 3 mm SIS mixer

A new SIS mixer was installed in the 3mm receiver in July 1994. The sensitivity and stability are so good that the receiver is used on a standard basis for pointing. Receiver temperatures are between 80 and 120 K (SSB). The image sideband rejection is between 25 dB and 30dB. This basically solves the calibration problem at 115 GHz caused by the strong oxygen line at 118 GHz. Many positive reports from observers using the new 3mm SIS mixer were received.

Robert Lucas
Thu Mar 9 12:58:13 MET 1995