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We have constructed a Fourier-transform spectrometer (FTS) operating between50 and 330 GHz with minimum volume (355 x260 x64 mm) and weight (13 lbs) whilemaximizing optical throughput (100 $\mathrm{mm}^2$ sr) and optimizing thespectral resolution (4 GHz). This FTS is designed as a polarizingMartin-Puplett interferometer with unobstructed input and output in which bothinput polarizations undergo interference. The instrument construction is simplewith mirrors milled on the box walls and one motorized stage as the singlemoving element. We characterize the performance of the FTS, compare themeasurements to an optical simulation, and discuss features that relate todetails of the FTS design. The simulation is also used to determine thetolerance of optical alignments for the required specifications. We detail theFTS mechanical design and provide the control software as well as the analysiscode online.

A Compact Millimeter-Wavelength Fourier-Transform Spectrometer