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We measure the direct detection effect in a small volume (0.15??m×1??m×3.5?nm) quasioptical NbN phonon cooled hot electron bolometer mixer at 1.6?THz. We find that the small signal sensitivity of the receiver is underestimated by 35% due to the direct detection effect and that the optimal operating point is shifted to higher bias voltages when using calibration loads of 300?K and 77?K. Using a 200?GHz bandpass filter at 4.2?K the direct detection effect virtually disappears. This has important implications for the calibration procedure of these receivers in real telescope systems

Direct detection effect in small volume hot electron bolometer mixers