For a comparison of how the 3 (GSM, UMTS, LTE) systems look in view of a meter we have created the following animations:
GSM Basestations, small bandwidth, pulsing depending on usage of channels. Roughly 200 kHz per channel.
124 channels for GSM 900, which is shown left. Meaning theoretical (without taking signalling channels into acount) about 950 simultaneous calls possible.
GSM data bandwidth:
EDGE: 236.8 kbit/s
Listen to the demodulated GSM sound, this is what your body is constantly radiated with:
UMTS Basestations, bandwidth 5 MHz, we see here 12x2x5MHz, so 120 channels, each supporting about 130 simultanous phone calls, so theoretical 15600 calls.
UMTS data bandwidth:
UMTS: 384 kbit/s
HSDPA: 14,400 kbit/s – 14.4 Mb/s
Listen to the demodulated UMTS sound, this is what your body is constantly radiated with:
LTE Basestation, this shows only a single provider with 10 MHz bandwidth.
LTE shows as in the animation high pulsing when the channel is not completely used. The radiation seems lower, though this is only due to a larger distance from the base station during measuring.
This is in the works, but needs an additional USB soundcard, to provide « line in », in order to record from the meter directly. The below seems most suitable for Linux:
Amazon DE: Behringer UCA222 USB/Audio Interface
Amazon UK: Behringer UCA222 USB/Audio Interface
If anyone has this unused flowing around and could provide us with it, we’d be very thankful. It seems there is no mp3 file with the LTE sound online available?
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More EMF sounds can be listened and downloaded here: