Deployment of a fully integrated 360GHz Schottky Diode Based Receiver at the Mexican Large Millimetre Telescope

A room temperature sub-millimetre-wave Schottky barrier diode heterodyne receiver system (the Collaborative Heterodyne Astronomical Receiver for Mexico aka CHARM) operating at ~360GHz, has been deployed at the Large Millimetre Telescope, Mexico. The receiver is fully integrated as a turn-key system, and uses a double-sideband subharmonic mixer with an average noise equivalent system temperature of 1,000K. The system back-end signal processing incorporates four wide-band digital spectrometers, with a combined instantaneous IF bandwidth of 10.4GHz for both upper and lower side-bands, and a channel spectral resolution of 1.2MHz. The system has been used to observe first light with the LMT in the sub-millimetre-wave range. It will be further used to perform estimates of the telescope system performance in support of future sub-millimetre-wave observations from the LMT.