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All mixers use SRON junctions.
Finally, the D-band multiplier failed recently and has been repaired. The receiver has performed very well to date, with frequency coverage and sensitivity close to those anticipated in both frequency windows. Commissioning receiver W has proved to be slow and full characterisation of the receiver is still not yet complete. The main difficulty has been in obtaining sufficient observing time during the necessarily good conditions. It should be noted that until the end of the characterisation not all receiver parameters are well known and users should allow time to measure efficiencies.