G Way Solutions CELLAB25W90 User Manual

INSTALLATION

AND

OPERATING MANUAL

FOR

BDA-CELLAB-2/25W-90-OA

INDOOR 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
OPTIONAL EQUIPMENT OVERVIEW 7
MECHANICAL OUTLINE DRAWING (Figure 2 & 2a) 8
OPTIONAL BATTERY BACK-UP CONFIGUATION

(Figure 3)

BDA INSTALLATION

RF EXPOSURE WARNING 10
BDA OPERATION 11
INTERNAL VIEW (Figure 4) 12
CONTROL PANEL ADJUSTMENT (Figure 5) 13
DIAGNOSTICS GUIDE 14

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9

10

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.
The BDA supports modulation types CDMA and GSM.

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 CELLAB frequency bands are as
follows: 824-849 MHz for the Uplink and 869-894 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 Manual
Gain Control (MGC) provides continuous control of amplifier gain. 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.

7.

4. 5.

BDA Block Diagram

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

2. Downlink Pre-amp - is a low noise amplifier that drives the Downlink PA and
offers 46dB Gain

3. Downlink PA – is a power amplifier with an ALC circuit which offers 43dB Gain

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

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

6. Filters used on High-Gain Repeaters (90dB) to provide better isolation between
Tx & Rx frequencies and to aid the diplexer rejection.

7. Downlink Tx filter is enhanced for High Power applications, preventing arching
when the power amplifier approaches the 1dB compression point.

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ELECTRICAL SPECIFICATIONS:

Frequency Range
Uplink : 824-849 MHz
Downlink : 869-894 MHz

Pass Band Gain @ min attenuation : 95 dB (Typ.)

Variable Step Attenuator Range : 0-30 dB
(2-dB steps)

Pass band Ripple : ±1.5 dB (typ)

20 dB Bandwidth : 30 MHz (Max.)

Noise Figure @+25

3rd Order Intercept point
Uplink : +47 dBm (typ)
Downlink : +55 dBm (typ)

Output Power @ 1dB Compression
Uplink : +34 dBm (typ)
Downlink : +44 dBm (typ)

ALC Factory Set Point
Uplink : +27 dBm composite*
Downlink : +37 dBm composite*

*

Single carrier CDMA or GSM modulation types

Isolation between Up/Down Link : 110 dB min.

Input/ Output Impedance : 50 Ohms

VSWR (Input/Output) : 1.5: 1 max.

Power Supply : 110VAC/1.4 Amp

*The Manufacturer's rated output power of this equipment is for single carrier operation. For
situations when multiple carrier signals are present, the rating would have to be reduced by

3.5 dB, especially where the output signal is re-radiated and can cause interference to
adjacent band users. This power reduction is to be by means of input power or gain
reduction and not by an attenuator at the output of the device.

°C at max gain : 4.0 dB max.

: 240VAC/0.7 Amp
: 50 to 60 Hz

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