flight_Berlin_london

The detektors was recording during a standard flight from Berlin to London. You can hear that the permanently existing high pitched tone (base transceiver station (BTS) signal of mobile phone network) dissappears between 32:30 and 33:35. This should also be the time of takeoff of the plane. Afterwards you can hear clearly the famous rhythm of a GSM phone, 3G mobile phones and other signals. People don’t repect the instructions of the plane crew to switch off all electronic devices. Does somebody know what kind of signal at i.e 47:00 was sended? Also at 120:00 interesting sounds are hearable! This must have some connection to the airplanes communication with a control tower. Aroud 126:00 the high pitched tone which dominates the infoscape of a urban city gets hearable.