First test observations have been done at 230 GHz with the new
dual-frequency receiver installed on Antenna 4. Receiver temperature
is about 70--80 K at 1.3 mm, and first pointing showed an offset of
the 1.3 mm
receiver by (-4,+8) arcseconds from the 3 mm receiver. No
further attempt to align the receiver has been made, but the
receiver has been used for a first VLBI experiment at 1.3mm (page
).