Please find enclosed S53MV table about radio digital modes! Progress is about 100 times in 100 years... Mode Year Info BW Efficiency CW 1900 10bit/s 100Hz 0.1 bit/s/Hz RTTY 1950 50bit/s 250Hz 0.2 bit/s/Hz GSM 1990 271kbit/s 200kHz 1.355bit/s/Hz WLAN 2010 108Mbit/s 11MHz 9.818bit/s/Hz 73 de Mario, S56A, N1YU