... Currently a 94 GHz radiation source, located on a nearby Telescope (United Kingdom Infra-Red Telescope) is used to illuminate the JCMT surface. ... The instrument uses two main frequencies, 80 and 160 GHz, and is frequency agile around these frequencies to allow for the elimination of spurious signal paths. ... DAU The DAU is a VME-based 68060 computer with a Wind River's VxWorks operating system and applications coded in the Anglo-Australian Telescope's DRAMA C programming environment2 ). ...

Radio Interferometry Principles . Radio Interferometry Signal Processing . ... A radio interferometer consists of a pair of directional antennas that are tuned to receive radio emissions from a source in a desired RF band. ... The antennas are pointed at the radio source of interest and are set up to receive the signal and process it into a form suitable for transmission to the correlator. ... In connected element interferometry, the digital signal goes directly to the correlator. ...

... In FOS polarimetry mode the incoming beam was split into orthogonal polarization components by a Wollaston prism behind the entrance aperture. ... As with non-polarimetric observations, no concurrent WAVECAL exposure was routinely taken with polarimetry data, so the limiting accuracies of the default pipeline polarimetry wavelength calibration are the same as for the non-polarimetry case described earlier ( See "Wavelength Calibration" on page 32-49. ...

... Frequency Receivers High (?) ... Receivers Why would you want one? ... Signal in feed fsignal Signal in feed fsignal Noise source Coupler to main signal path Signal in feed OMT (polariser) fsignal fsignal Noise source fsignal To get both polarisation components Signal in feed OMT amplifier (polariser) fsignal fsignal Noise source fsignal fsignal Signal in feed OMT amplifier (polariser) ... This is currently true for receivers operating above 100 GHz...