## TACS Total Access Communication System (TACS) and ETACS are mostly-obsolete variants of Advanced Mobile Phone System (AMPS) which was announced as the choice for the first two UK national cellular systems in Feb 1983. Frequency range base station: 935.0125 MHz - 949.9875 MHz Frequency range mobile station: 890.0125 MHz - 904.9875 MHz Control channels: 21 for System A Voice channels: 289 for System A Control channels: 21 for System B Voice channels: 289 for System B Duplex distance: 45 MHz Channel spacing: 25 KHz Voice modulation: FM Signaling modulation: carrier FSK Frequency deviation: 6.4 KHz (FSK) Mobile station transmit power: 10 or 4 Watts (vehicular) 1.6 or 0.63 Watts Base station transmit power: ??? (around 50 Watts) (J)TACS is the UK and Japanese version of the AMPS. There are three major differences: Different channel frequencies 6,400 Hz signaling rate (instead of 8,000 Hz) Encoding of mobile station number Refer to AMPS documentation, but use executable 'tacs' or 'jtacs' instead of 'amps'. [Back to main page]