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We describe a Fourier transform spectrometer for measurements of atmospheric transmission in the spectral interval 300 GHz to 3.5 THz. This instrument has been developed to evaluate prospective sites for radio astronomical observations at frequencies above 1 THz. Measurements have been made on Mauna Kea, Hawaii, and at the site of the future Millimeter Array near Cerro Chajnantor in northern Chile. Chajnantor frequently exhibits signiÐcant transmission in atmospheric windows at frequenciesdoi:10.1086/316497 fatcat:bphmgfa7nvdenohfqjqnv5t6dy