While SIS and Schottky barrier mixers have demonstrated decreasing receiver noise temperatures up to 500 GHz in the last few years, there is still a lack of very low noise receivers above that frequency. The bulk InSb hot electron (bolometric) mixer is outstanding in terms of noise temperature ( 500 K DSB at 0.8 THz), which indicates that bolometric, bulk mode, mixers have an intrinsic advantage at the higher frequencies. The InSb mixer has the major drawback of a very narrow ( 1 MHz) bandwidth. Smith et al. (1987) proposed the use of the Two-Dimensional Electron Gas (2DEG), biased to cyclotron resonance, as a new mixer medium in order to solve this problem, and realized a direct detector. We have used the same medium in a different mode , and demonstrated a hot electron mixer with a three orders of magnitude increase in the bandwidth, compared with the InSb mixer.