Operating Instructions

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
1.2 FBDA
The FBDA is installed near the area to be covered and is connected to the
mobile antenna. A Fiberoptic transceiver converts the Downlink optical
signals to RF signals and the uplink RF signals to optical signals. A duplexer
in the FBDA separates the uplink and downlink signals thus enabling the use
of the same antenna for receiving and transmitting. The duplexer has sharp
out of band attenuation for better isolation between the receiving and
transmitting paths and for reduction of out of band interfering signals. A high
power amplifier in the downlink path produces high RF power to the antenna.
A LNA (low noise amplifier) is used to drive the uplink signals from the
antenna to the Fiberoptic transceiver input to maintain reasonable NF (noise
figure) in the uplink path. The FBDA contains a monitoring unit to monitor the
operation of the active elements inside the FBDA. Whenever a fault occurs
an ALARM signal is sent to the FBIU.
For diversity applications the uplink path is duplicated using separate
antenna, filter, LNA and Fiberoptic transmitter.
Fig. 1 : Fiber-optic REPEATER SYSTEM BLOCK DIAGRAM
Mobile ANT.
BTS
High pwr
ATTN.
Tx
Rx
F/O+
WDM
RF IN
RF Out
optical in/out
optical in
F/O+
WDM
optical in/out
optical Out
FBDA
RF
section
BASE SITE
FIBEROPTIC CABLE
RUN UP TO 20Km
ATTN.
(MAX. 0dBm)
F/O
F/O
RF Out
ATTN.
Rx1
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FO-800AB-50W SYS.doc