G Way Solutions CELLABHW70 User Manual

INSTALLATION

AND

OPERATING MANUAL

FOR

BDA-8XX-0.5/0.5W-XX-AX

MINI-BI-Directional Amplifier

TABLE OF CONTENTS

PARAGRAPH PAGE NO

Mini-BDA OVERVIEW 3
Mini-BDA BLOCK DIAGRAM DESCRIPTION 3
Mini-BDA OPTIONS 3
Mini-BDA BLOCK DIAGRAM DRAWING (Figure 1) 4
ELECTRICAL SPECIFICATIONS 5
FREQUENCY RANGES (Table 1) 6
SYSTEM SPECIFICATIONS (Table 2) 6
MECHANICAL CONNECTIONS 7
ENVIRONMENTAL CONDITIONS 7
Mini-BDA CONNECTIONS 7
MECHANICAL OUTLINE DRAWING (Figure 3 & 3a) 8
RF EXPOSURE WARNING 9
Mini-BDA INSTALLATION 10
Mini-BDA OPERATION 11
MECHANICAL OUTLINE- ADJUSTMENT (Figure 4) 12
DIAGNOSTICS GUIDE 13

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Mini-BDA OVERVIEW:

The Mini-BDA assembly extends the coverage area of radio communications in
buildings and RF shielded environments. The Mini-BDA has dual RF paths to extend
coverage in two distinct frequency bands.
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.

Mini-BDA BLOCK DIAGRAM DESCRIPTION

:

Refer to Figure 1 for the following discussion.
The Mini-BDA Downlink path receives RF signals from the base station and amplifies

and transmits them to the subscriber. The Mini-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.

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.

Mini-BDA Options:

An optional 9 pin D-sub connector is available for external alarm monitoring (See
Figures 3 & 3a).

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Figure 1

1. 2. 3.

4. 5. 6.

Mini-BDA BLOCK DIAGRAM

1. Uplink Diplexer - has low pass ban d insertion loss and high selectivity.

2. Downlink Pre-amp - is a low noise amplifier that drives the Downlink MPA and offers
38dB Gain.

3. Downlink MPA – is a medium power amplifier with an ALC circuit which offers 40dB
Gain.

4. Uplink MPA – is a medium power amplifier with an ALC circuit which offers 40dB
Gain.

5. Uplink Pre-amp - is a low noise amplifier that drives the Uplink MPA and offers 38dB
Gain.

6. Downlink Diplexer - has low pass band insertion loss and high selectivity.

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