G Way Solutions UHF4W70 User Manual

INSTALLATION

AND

OPERATING MANUAL

FOR

BDA-UHF-4/4W-70-A

BI-DIRECTIONAL AMPLIFIER

TABLE OF CONTENTS

PARAGRAPH PAGE NO

BDA OVERVIEW 3
TYPICAL INSTALLATION (Figure 1) 3
BDA BLOCK DIAGRAM DRAWING (Figure 2) 4
OPTIONAL EQUIPMENT 4
ELECTRICAL SPECIFICATIONS 5
MECHANICAL SPECIFICATIONS 6

ENVIRONMENTAL CONDITIONS 6

BDA CONNECTIONS 6
MECHANICAL OUTLINE DRAWING (Figure 3 & 3a) 7
BDA INSTALLATION 9
RF EXPOSURE WARNING 9

BDA OPERATION 10

MECHANICAL OUTLINE- ADJ. (Figure 4 & 5) 11

DIAGNOSTICS GUIDE 12

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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.

Refer to figure 1 for the following discussion.

The illustration is a typical scenario of In-Building Signal Enhancement. On the top of
the structure, the directional antenna points to closest Base Station (Uplink), the
Indoor repeater is inside the building and internal antennas send and receive signals
from a Mobile telephone.

Figure 1

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BDA BLOCK DIAGRAM DESCRIPTION

:

Refer to figure 2 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, a sample frequency

band in UHF is as follows: 468.0-470.0 MHz for the Uplink and 463.0-465.0 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.

OPTIONAL EQUIPMENT OVERVIEW

:

DC Input Power Option (S1)

a.)

The BDA is equipped with both AC and DC voltage inputs for power operation. This
gives the flexibility of powering the BDA with either an AC or DC source. If both
sources are connected, the BDA will automatically select the stronger source for
power.

b.) Uninterruptible Power System (UPS)

An optional UPS is offered for systems that need emergency back-up power. The
system can easily be connected to a battery for uninterruptible operation. Not only
does the power supply power the load, but it also charges the battery. If the AC

power fails, the battery will uphold the load.

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