G Way Solutions CELLB2W80CA User Manual

INSTALLATION

AND

OPERATING MANUAL

FOR

BDA-CELLB-2/2W-80-OCA

OUTDOOR REPEATER

TABLE OF CONTENTS

PARAGRAPH PAGE NO

BDA OVERVIEW 3
BDA BLOCK DIAGRAM DESCRIPTION 3
OPTIONAL EQUIPMENT OVERVIEW 3
BDA BLOCK DIAGRAM DRAWING (Figure 1) 4
ELECTRICAL SPECIFICATIONS 5
MECHANICAL SPECIFICATIONS 6
ENVIRONMENTAL CONDITIONS 6

BDA CONNECTIONS 6
MECHANICAL OUTLINE DRAWING (Figure 2) 7
ALARM CONFIGUATION (Figure 3) 8
ALARM LED CONFIGUATION (Figure 4) 8

RF EXPOSURE WARNING 9

BDA INSTALLATION 10

BDA OPERATION 11

VARIABLE GAIN ADJUSTMENT 12
ALC ADJUSTMENT 12

DIAGNOSTICS GUIDE 13

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BDA OVERVIEW:

The BDA assembly extends the coverage area of radio communications in
buildings and RF shielded environments.
The unit features low noise figure and wide dynamic range. It is based on a
duplexed path configuration with sharp out of band attenuation allowing improved
isolation between the receiving and transmitting paths.

BDA CIRCUIT DESCRIPTION

:

Refer to figure 1 for the following discussion.

The BDA Downlink path receives RF signals from the base station and amplifies
and transmits them to the subscriber. The BDA Uplink path receives RF signals
from the subscriber and amplifies and transmits them to the base station. The
Uplink and Downlink occupy two distinct frequency bands. For example, the

CELL B frequency bands are as follows: 835-849 MHz for the Uplink and 880-
894 MHz for the Downlink. Two diplexers isolate the paths and route each signal

to the proper amplifying channel.

A selectable 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.

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Figure 1

1. 2. 3.

H

6.

4. 5.

BDA Block Diagram

1. Up-Link Diplexer - has low bandpass insertion loss and high selectivity

2. Down-Link Pre-amp - is a low noise amplifier that drives the Down-Link
HPA and offers 46dB Gain

3. Down-Link HPA – is a high power amplifier with an ALC circuit which
offers 43dB Gain

4. Up-Link MPA – is a medium power amplifier with an ALC circuit which
offers 43dB Gain

5. Up-Link Pre-amp - is a low noise amplifier that drives the Up-Link MPA
and offers 46dB Gain

6. Down-Link Tx filter is enhanced for High Power applications, preventing
arching when the power amplifier approaches the 1dB compression point.

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