Homin Jiang, Chen-Yu Yu
We have designed, implemented, deployed and tested a 65K channels spectrometer for the Greenland telescope (GLT) in Thule Greenland. GLT is built for single-dish observations which are expected up to 15 THz frequency for sub-millimeter astronomy. Two IF signals of 2.048 GHz bandwidth are digitized by the 8-bit, 5 giga samples per second (Gsps) analog-to-digital converter printed circuit board assembly (PCBA) developed by ASIAA. The digitized data are processed with Reconfigurable Open Architecture Computing Hardware (ROACH2) field-programmable gate array (FPGA) platform developed by Collaboration for Astronomy Signal Processing and Electronics Research (CASPER) community. ROACH2 is programed with the model file to acquire the data, channelize the signal and perform the fast Fouier transform(FFT). A NETGEAR M4300 12X12F 10-Gigabit Ethernet (GbE) switch is adapted to do the data transmission between ROACH2 and the controlling computer. In winter of 2017, the spectrometer was deployed on site, after one month of tuning and testing, in February 2018, we got couple of SiO maser signals during the radio pointing exercise. Those are SiO masers of TX CAM, BX CAM, T CEP and RCAS at very high elevation.