Electro-magnetic interference from an AT&T; cordless phone handset CL82301 when held near the internal Ferrite antenna on the back right of a 13-year-old boombox at 1700 KHZ in the AM broadcast band. Recorded with Goldwave from line-in. You hear a series of beeps shifting between one of 3 tones. These are the fastest and highest pitched standby tones I've come across with this phone. The higher AM frequency picks up an extra buzz not there at lower frequencies.
AT＆T無繩電話關閉充電器不動1700 KHZ.wav
聲道：2
類型：wav
radio-interference、am-radio、buzz、sequence-of-tones、t、EMF、EMI、glitch、beep、electro-magnetic、pulse、interference、digital、lo-fi、hum、electronic、tone、noise、cordless-phone
無線電干擾、上午無線電、蜂鳴器、序列的色調、Ť、EMF、一個微笑、毛刺、嘟、電磁、脈衝、干擾、數字、路飛、哼、電子、音、噪聲、無繩電話
資料來源：freesound ( https://freesound.org )