Dekolink Wireless BDAESMR50W90 Users Manual
Dekolink WIRELESS Ltd.
16 Bazel St. Qiryat-Arieh Petah-Tikva, Israel, 49510
Tel- 972-3-9180-180 Fax-972-3- -
e-mail: marketing@decolink.com web www.decolink.com
INSTALLATION
AND
OPERATING INSTRUCTIONS
FOR
HIGH POWER REPEATER
MODEL: MW-BDA-ESMR-50W90
Page 1 of 14 50W rev 3 - 11/03
Dekolink WIRELESS Ltd.
16 Bazel St. Qiryat-Arieh Petah-Tikva, Israel, 49510
Tel- 972-3-9180-180 Fax-972-3- -
e-mail: marketing@decolink.com web www.decolink.com
TABLE OF CONTENTS
PARAGRAPH PAGE No
REPEATER OVERVIEW 3
BLOCK DIAGRAM DESCRIPTION 3
REPEATER (BDA) CONNECTION 3
STEP ATTENUATOR & RF GAIN & SETTING 4
AGC FUNCTION 4
BDA MONITOR 5
BDA MONITOR FUNCTIONS 6
BDA INSTALLATION 8
BASE / DONOR ANTENNA INSTALLATION 8
REMOTE / MOBILE SERVICE ANTENNA INSTALLATION 8
ANTENNA ISOLATION 8
INSTALLATION STEPS 9
RF EXPOSURE WARNING 10
ELECTRICAL SPECIFICATIONS 11
MECHANICAL SPECIFICATIONS 11
ENVIRONMENTAL CONDITIONS 11
MECHANICAL LAYOUT 12
MECHANICAL OUTLINE 13
LIMITED WARRANTY 14
LIST OF DRAWINGS
DRAWING PAGE No
REPEATER(BDA) RF BLOCK DIAGRAM 4
BDA MONITOR 7
BDA MONITOR BLOCK DIAGRAM 7
MECHANICAL LAYOUT 13
MECHANICAL OUTLINE 13
Page 2 of 14 50W rev 3 - 11/03
Dekolink WIRELESS Ltd.
16 Bazel St. Qiryat-Arieh Petah-Tikva, Israel, 49510
Tel- 972-3-9180-180 Fax-972-3- -
e-mail: marketing@decolink.com web www.decolink.com
REPEATER OVERVIEW:
The Bi-Directional Repeater assembly provides an exceptional repeater/booster
performance to extend the coverage area of radio communications in buildings
and RF shielded environments.
Features such as high linearity power amplifiers are contributing for the overall
improved system linearity performances. The unit is based on a duplexed path
configuration, having sharp out of band attenuation for improved isolation
between the receiving and transmitting paths.
BLOCK DIAGRAM DESCRIPTION:
The Repeater Downlink path receives the RF signals from base station,
amplifies them and transmits them to the subscriber. The Repeater Uplink path
receives the RF signals from the subscriber, amplifies them and transmits them
to the base station. Two duplexers frequency separate the signals to the proper
amplifying path and isolate the two signals.
For each path two amplifiers do the path signal amplification; a low noise
amplifier (LNA) and a high power amplifier. The low noise amplifier has a 30 dB
step attenuator to set the gain of the specific path.
REPEATER (BDA) CONNECTION
The RF connection is made via two type “N” female connectors. The RF
connector labeled “Base” must be connected to the antenna pointing to the base
station; usually a rooftop antenna. The RF connection labeled “Mobile” must be
connected to the antenna pointing into the area to be covered by the Repeater
such as inside a building or outdoor shaded area.
Page 3 of 14 50W rev 3 - 11/03
TO
BASE
Dekolink WIRELESS Ltd.
16 Bazel St. Qiryat-Arieh Petah-Tikva, Israel, 49510
Tel- 972-3-9180-180 Fax-972-3- -
e-mail: marketing@decolink.com web www.decolink.com
TO
MOBILE
PA
AGC
Power
Monitor
Duplexer
LNA
Duplexer
LNA
Power
Monitor
Attenuator
Downlink
PA
AGC
Attenuator
Uplink
BDA RF BLOCK DIAGRAM
STEP ATTENUATOR AND RF GAIN SETTING
For proper operation of the Repeater, the isolation between the base station antenna
and the mobile antenna should exceed the Repeater gain by at least 12 dB. If the
Repeater gain were higher than the isolation between the antennas, oscillation would
start and would saturate the amplifier. Isolation few dB higher than the Repeater gain
cannot start oscillations but would cause gain ripple in the band.
The step attenuator on the low noise amplifier reduces the Repeater gain. The Repeater
gain can be stepped down by the amount indicated on the step attenuator.
AGC FUNCTION
The Repeater has AGC function on both paths that serve to prevent the saturation of
the power amplifier. When a high signal is received the AGC circuit detects the
amplitude and sends a feedback signal to a variable attenuator, which attenuates the
signal level so that the output power of the amplifier does not exceed the preset limit.
The green LED on the BDA monitor (AGC Range) illuminates when the power output of
the amplifier is within the set limit. An On/Off switch on the connection box enables the
AGC function. If the AGC is disabled then the amplifier gives maximum gain.
WARNING: For proper operation the AGC switch must be ON to prevent
excessive spurious.
Page 4 of 14 50W rev 3 - 11/03
Dekolink WIRELESS Ltd.
16 Bazel St. Qiryat-Arieh Petah-Tikva, Israel, 49510
Tel- 972-3-9180-180 Fax-972-3- -
e-mail: marketing@decolink.com web www.decolink.com
BDA MONITOR
The BDA monitor circuit monitors the following functions:
RF power transmitted by the power amplifiers.
For the downlink channel a red fault LED illuminates if the power is 10 dB below the
specified composite power. In normal use the downlink channel continuously transmits
RF signals and this LED should be on. When the donor reception from the base is bad
this LED turns on to warn that the repeater is not being used efficiently. Another green
LED illuminates when the power reaches or exceeds this power (10W). This is used to
set the repeater gain. This limit is the same as the AGC limit and is factory preset.
For the uplink channel a green indicator LED illuminates when the power reaches or
exceeds its composite power (1W). When the isolation between the antennas is bad this
LED lits permanently. This LED should turns on only when a near by cellular is used.
This limit is the same as the AGC limit and is factory preset.
DC voltage of the channels. The fault LED illuminates when the voltage is below or
above the specified limits.
DC current to each of the two LNAs and the uplink power amplifier. If the current is
below or above the specified limits then a LED illuminates.
Page 5 of 14 50W rev 3 - 11/03
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