Welcome to the World of CDMA
CDMA cellular service is intended to share the existing AMPS
spectral allocation, shown below.
Consecutive AMPS channels are spaced by 30 kHz. CDMA stations
are permitted to operate on any AMPS channel, except for guard
bands at the edges of the allocations. CDMA stations, of course,
would normally be assigned channel at least 1.25 MHz apart
(about 42 channels). The mobile station transmit frequency
is always 45 MHz lower than the base station transmit frequency.
PCS (J-STD-008)PCS is allocated 60 MHz total in each direction, as three 15 MHz bands plus three 5 MHz bands, shown below.
In contrast to the cellular service, the standard suggests particular channel numbers as preferred CDMA frequency assignments as follows.
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