This project delivers a handheld electromagnetic noise generator capable of emitting a tunable broadband noise signal across the 2.4–2.5 GHz ISM band. It is designed to enable practical electromagnetic interference (EMI) susceptibility testing for hobbyists and electronics consumers. In a landscape filled with inexpensive electronics from unknown sources, this device provides an accessible way for individuals to assess how their homebuilt or purchased electronics respond to electromagnetic noise without requiring expensive laboratory equipment. The system is built around an STM32F407VET6 microcontroller that drives a MAX2870 wideband PLL frequency synthesizer over SPI. The MAX2870 generates a deliberately noisy fractional-N output signal, producing a moving spike of spectral activity visible on a spectrum analyzer. The signal is then passed into a fixed +20 dBm amplifier to strengthen the signal. The system is housed in an enclosure with an antenna output connected to the amplifier. A notable accomplishment of this project is the successful integration of a complete RF signal chain, from microcontroller register control to a tunable antenna output, within a low-cost and accessible hardware platform. A key challenge was correctly configuring the code and in turn, assembling the system. This process required careful manipulation of the SPI timing and hardware interface. For future improvement signal gain adjustability and more user input control could be implemented to make the noisemaker more robust