G Way Solutions CELLAB1W80 User Manual

INSTALLATION

AND

OPERATING MANUAL

FOR

BDA-XXX-1/1W-80-B

BI-DIRECTIONAL AMPLIFIER

TABLE OF CONTENTS

PARAGRAPH PAGE NO

BDA OVERVIEW 3
BDA BLOCK DIAGRAM DESCRIPTION 3
BDA BLOCK DIAGRAM DRAWING (Figure 1) 4
ELECTRICAL SPECIFICATIONS 5

FREQUENCY RANGES (Table 1) 6

MECHANICAL SPECIFICATIONS 7
ENVIRONMENTAL CONDITIONS 7

BDA CONNECTIONS 7
MECHANICAL OUTLINE DRAWING (Figure 2 & 2a) 8

RF EXPOSURE WARNING 9

BDA INSTALLATION 10

BDA OPERATION 11

MECHANICAL OUTLINE- ADJUSTMENT (Figure 3) 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 BLOCK DIAGRAM 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 SMR frequency

bands are as follows: 806-821 MHz for the Uplink and 851-866 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.

6.

4. 5.

BDA BLOCK DIAGRAM

BDA-XXX-1/1W-80-A

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 MPA and
offers 45dB Gain

3. Down-Link MPA – is a medium 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 45dB Gain

6. Down-Link Diplexer - has low bandpass insertion loss and high selectivity

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