Emission from a BPT-4000 Hall-effect thruster operating at 4.5 kilowatts with discharge voltages of 300 and 400 volts. The frequency span shown (10 kilohertz to 18 gigahertz) was measured using four broadband antennas and a spectrum-analyzer-based receiver controlled by Aerospace-developed software. An increase of 20 decibels is equivalent to a 10X increase in measured electric field. Spacecraft EMC limits are payload specific and generally proprietary; the MIL-SPEC limit is shown for comparison.