  The digitalisation of the modern schooling system has led to multiple schools
and organisations buying similar hardware. Electronic equipment like wireless
microphones, projectors, touchscreen displays etc., have been almost
standardised with a few well-known brands leading the market. This has led to
the adoption of common frequency ranges between brands with many sticking
between 600-670 MHz. The popularity of low-cost computing devices like the
Raspberry Pi which has been used in a plethora of applications has also taken
the path of being used as low-cost transmitters. There have been many
implementations where the Raspberry Pi has been used as the target device but
few cases where the PI is the actual threat. In this paper, we explore the use
of the Raspberry Pi as a stealth radio frequency jamming device to disable
wireless conference microphones. Harmonics were used to achieve frequencies
outside the Pi's transmission frequency by taking advantage of its unfiltered
transmission.
