Performance of the pre-production band 3 (84-116 GHz) receivers for ALMA

The Band 3 receiver, covering the 84-116 GHz frequency band is one of the 10 channels that will be installed on the Atacama Large Millimeter Array (ALMA). A total of 73 units have to be built in two phases: 8 preproduction and then 65 production units. This paper reports on the assembly, testing and performance of the preproduction series of these state-of-the-art millimeter receivers.