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We present MeqSilhouette v2.0 (MeqSv2), a fully polarimetric, time-andfrequency-resolved synthetic data generation software for simulating millimetre(mm) wavelength very long baseline interferometry (VLBI) observations withheterogeneous arrays. Synthetic data are a critical component in understandingreal observations, testing calibration and imaging algorithms, and predictingperformance metrics of existing or proposed sites. MeqSv2 applies physics-basedinstrumental and atmospheric signal corruptions constrained byempirically-derived site and station parameters to the data. The new version iscapable of applying instrumental polarization effects and various otherspectrally-resolved effects using the Radio Interferometry Measurement Equation(RIME) formalism and produces synthetic data compatible with calibrationpipelines designed to process real data. We demonstrate the various corruptioncapabilities of MeqSv2 using different arrays, with a focus on the effect ofcomplex bandpass gains on closure quantities for the EHT at 230 GHz. Wevalidate the frequency-dependent polarization leakage implementation byperforming polarization self-calibration of synthetic EHT data using PolSolve.We also note the potential applications for cm-wavelength VLBI array analysisand design and future directions.

MeqSilhouette v2: Spectrally-resolved polarimetric synthetic data generation for the Event Horizon Telescope