spurious emission
radio frequency not deliberately created or transmitted, especially in a device which normally does create other frequencies
en-US/ˈspjʊɹiəs ɪˈmɪʃən/
en-GB/ˈspjʊɹɪəs ɪˈmɪʃən/
radio frequency not deliberately created or transmitted, especially in a device which normally does create other frequencies