... I have undertaken a limited survey of water maser sources in the sub-mm continuum. ... Source selection . ... We have defined such a sample using the Arcetri catalogues of Comoretto et al. (1990) and Brand et al. (1994) , and have observed 44 of these sources in continuum (and in some cases at also), using the 15-m JCMT . ... 1994) . ... This source is interesting in that it is one of only two sources in the sample where the water maser is not associated with the sub-mm dust emission. ...

... The design employs a differential structure. ... The input is adapted to 100 differential, and the outputs use standard Low Voltage Differential Signaling (LVDS). ... T/H SINGLE T/H Single Input T/H Single Output 1.35 0.15 0.2 T/H DIFFERENTIAL Input T/H Output T/H 0.1 1.3 0.05 volts volts Figure 5: Digital part and digital gate 0 1.25 -0.05 -0.1 1.2 Integrated Test System A test system is integrated on chip to evaluate the transmission to the data acquisition card (fig: 7). ...