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OVERVIEW:
The BDA-CELLAB/PCSF-33/3380-OCMG assembly enhances the coverage area of
radio communications in buildings and RF shielded environments.
The BDA-CELLAB/PCSF-33/33-80-OCMG has dual RF paths (Forward / Reverse) to
improve coverage in two distinct frequency bands.
The unit features low noise figure and wide dynamic range. It is based on a dual
duplexed path configuration with sharp out of band attenuation allowing improved
isolation between the receiving and transmitting paths.
BLOCK DIAGRAM DESCRIPTION:
Refer to Figure 1 for the following discussion.
The BDA-CELLAB/PCSF-33/33-80-OCMG Downlink path receives RF signals from
the base station, amplifies the signal and transmits the signal, without changing the
frequency, into a Distributed Antenna System at the direction of the mobiles. The
signal travels over a DAS medium that then dissipates the signal to the Mobile
subscribers. The BDA-CELLAB/PCSF-33/33-80-OCMG Uplink path receives RF
signals at the Mobile side from the DAS system, then amplifies it, and transmits the
amplified signal (without changing the without changing the frequency) to the base
station. This Dual Band BDA supports two Uplink and two Downlink, CELL AB and
PSC Full occupy distinct dedicated frequency bands.
For CELL AB Band, the frequency allocations are as follows:
Uplink: 824-849
MHz
Downlink: 869-894
MHz
For PCS Full Band, the frequency allocations are as follows:
Uplink: 1850-1910
MHz
Downlink: 1930-1990
MHz
The Quad-duplexer isolates the paths and route each signal to the proper amplifying
channel.
An Automatic Level Control (ALC) allows for output power limiting. A variable step
attenuator gives 0 – 30 dB of attenuation in 2 dB steps. The use of these controls is
covered in the “OPERATION” section, later in this document.
