Dekolink Wireless FBDA800AB50WD Installtion and operation instructions for amplifier with diversity

Dekolink WIRELESS Ltd.
16 Bazel St. Qiryat-Arieh Petah-Tikva, Israel, 49510
Tel- 972-3-9180-180 Fax-972-3- 190-9180
e-mail: [e-mail]

web www.decolink.com

INSTALLATION and OPERATION

INSTRUCTIONS

FOR

FiberLink

BI-DIRECTIONAL AMPLIFIER

WITH DIVERSITY

MW-FBDA-800AB-50W-DIV

Page 1 of 15 FBDA-800AB-50wDIV-INSTL.doc

Dekolink WIRELESS Ltd.
16 Bazel St. Qiryat-Arieh Petah-Tikva, Israel, 49510
Tel- 972-3-9180-180 Fax-972-3- 190-9180
e-mail: [e-mail]

web www.decolink.com

TABLE OF CONTENTS

PARA No. PARAGRAPH PAGE No.

1. OVERVIEW 3

2. COMPONENT DESCRIPTION 5

2.1 DUPLEXER 5

2.2 UPLINK AMPLIFIER 5

2.3 35 WATT DOWNLINK POWER AMPLIFIER 5

2.4

2.5 RFIBER TRANSMITTER 7

2.6 MONITOR UNIT 7

2.7 DISTRIBUTION UNIT 10

2.8 POWER SUPPLY 10

3 ELECTRICAL SPECIFICATIONS 11

3.1 RF SPECIFICATIONS 11

3.2 FBDA ALARM SPECIFICATIONS 12

3.3 MECHANICAL SPECIFICATIONS 12

3.4 ENVIRONMENTAL CONDITIONS 12

4 RF EXPOSURE WARNING 13

Fiberoptic transceiver

5

LIST OF FIGURES

Fig No. Fig. name Page No.

1 FBDA RF BLOCK DIAGRAM

2 RFIBER FRONT PANEL

3 RFIBER REAR PANEL

4 MONITOR OUTLINE

4

6

6

8

5 FIBERLINK ALARM BLOCK DIAGRAM 9

6 FBDA SYSTEM BLOCK DIAGRAM 13

7 MECHANICAL LAYOUT 14

8 MECHANICAL OUTLINE 15

Page 2 of 15 FBDA-800AB-50wDIV-INSTL.doc

Dekolink WIRELESS Ltd.
16 Bazel St. Qiryat-Arieh Petah-Tikva, Israel, 49510
Tel- 972-3-9180-180 Fax-972-3- 190-9180
e-mail: [e-mail]

web www.decolink.com

1. OVERVIEW:

The FBDA is an interface unit between optical signals carrying RF information, and RF

antennas covering a defined user area. The system consists of uplink path and

downlink path and an additional uplink path for diversity.

The uplink path receives RF signals from the Mobile antenna amplifies them and the

Rfiber+ converts them to optical signals. These optical signals are sent to the BTS.

The downlink path receives optical signals from the BTS to the Rfiber+, converts them

to RF signals and amplifies these signals using a high power amplifier. The Mobile

antenna transmits these RF signals.

A duplexing filter separates the frequencies of uplink path from the downlink path

enabling the use of the same antenna for receiving and transmitting. The FBDA

provides about 46 dB RF gain in both directions.

Both optical signals for Uplink and Downlink are carried on a single fiber using WDM.

Downlink gain can be adjusted using a trim pot on the Rfiber+ front panel for proper

output power.

Uplink gain can be adjusted by 16 dB continuous trim pot.

The downlink path uses a 50 Watt power amplifier while the uplink uses an AGC

amplifier to drive the uplink F/O transmitter. The AGC is set to 0 dBm, which is the

max power required by the F/O transmitter.

For diversity reasons there is an additional Uplink path consisting of Cavity band pass

filter, AGC amplifier, and Fiber optic transmitter. The optical signal of this path is

transferred via an additional fiber to the base station.

Page 3 of 15 FBDA-800AB-50wDIV-INSTL.doc

Dekolink WIRELESS Ltd.
16 Bazel St. Qiryat-Arieh Petah-Tikva, Israel, 49510
Tel- 972-3-9180-180 Fax-972-3- 190-9180
e-mail: [e-mail]

web www.decolink.com

TO BTS

Fig. 1 : FBDA RF BLOCK DIAGRAM

Optical

Fiber

Downlink / Uplink

Optical

Fiber

Uplink

(diversity)

WDM

Fiberoptic

Receiver

Fiberoptic

Transmitter

Fiberoptic

Transmitter

UP LINK

AMP

UP LINK

AMP

Step

Attenuator

AGC

AGC

Down link Power

Amplifier

TX

Duplexer

RX

Variable

Attenuator

Rx1

Filter

Variable

Attenuator

Page 4 of 15 FBDA-800AB-50wDIV-INSTL.doc

Dekolink WIRELESS Ltd.
16 Bazel St. Qiryat-Arieh Petah-Tikva, Israel, 49510
Tel- 972-3-9180-180 Fax-972-3- 190-9180
e-mail: [e-mail]

web www.decolink.com

2. COMPONENTS DESCRIPTION:

2.1 DUPLEXER(x2)

The duplexer serves to frequency separate uplink signals from downlink signals. The

duplexer has sharp out of band attenuation for better isolation between the receiving

and transmitting paths and for better rejection of interfering signal in the air. In the

Diversity path only the Rx part of the duplexer is used.

2.2 UPLINK AMPLIFIER(both Rx pathes)

The uplink amplifier is a low noise, 45dB gain unit. The amplifier contains AGC control

circuitry. When a high power signal is received the automatic level control detects it

and reduces the gain so that the output power of the amplifier is constant. The AGC

function limits the signal at the Fiberoptic transmitter input when high power signals

are received while keeping high gain when low power signals are received.

The LED on the amplifier illuminates when the power output of the amplifier exceeds

the AGC power set limit (when the AGC is either ON or OFF).

The Switch on the RF amplifier enables the AGC function. If the AGC is disabled then

the amplifier gives maximum gain for any input.

The AGC level is factory set to 0 dBm and AGC is set to ON, to prevent high power

damage at the Rfiber+ input.

2.3 50 WATT DOWNLINK POWER AMPLIFIER

This is the downlink power amplifier. It can drive 40 dBm composite power to the
MOBILE antenna. A thermostat attatched to this amplifier turns on TEMP alarm when
the temperature exceeds 80° C.

2.4 Fiberoptic to RF transceiver

The RFiber+TM product is a transceiver that includes a transmitter and receiver unit.

The transmitter converts the RF signals into light wave signals, which are then sent

over fiberoptic cables. The receiver converts light wave signals back to RF

The model in use is a wide band product in the 0.08-1 GHz frequency range and it

includes a WDM module to enable use of one fiber for Tx and Rx signals.

Page 5 of 15 FBDA-800AB-50wDIV-INSTL.doc