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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.
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< li > Frequency range base station: 935.0125 MHz - 949.9875 MHz
< li > Frequency range mobile station: 890.0125 MHz - 904.9875 MHz
< li > Control channels: 21 for System A
< li > Voice channels: 289 for System A
< li > Control channels: 21 for System B
< li > Voice channels: 289 for System B
< li > Duplex distance: 45 MHz
< li > Channel spacing: 25 KHz
< li > Voice modulation: FM
< li > Signaling modulation: carrier FSK
< li > Frequency deviation: 6.4 KHz (FSK)
< li > Mobile station transmit power: 10 or 4 Watts (vehicular) 1.6 or 0.63 Watts
< li > Base station transmit power: ??? (around 50 Watts)
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TACS is the UK version of the AMPS.
There are three major differences:
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< li > Different channel frequencies
< li > 6,400 Hz signaling rate (instead of 8,000 Hz)
< li > Encoding of mobile station number
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Refer to < a href = "amps.html" > AMPS< / a > documentation, but use executable 'tacs' instead of 'amps'.
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