Communication Components BDA-1819-60 BI-DIRECTIONAL AMPLIFIER User Manual MANUAL TECH DESC LABEL FORMAT BLK DIAGRAM

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Document ID	38056
Application ID	nQwX07equehLsJ4Fy7rodA==
Document Description	MANUAL TECH DESC LABEL FORMAT BLK DIAGRAM
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	5.03kB (62874 bits)
Date Submitted	1999-05-18 00:00:00
Date Available	1999-10-26 00:00:00
Creation Date	2001-06-25 13:53:04
Producing Software	Acrobat Distiller 4.0 for Windows
Document Lastmod	2001-06-25 13:53:05
Document Title	MANUAL TECH DESC LABEL FORMAT BLK DIAGRAM

THEORY OF OPERATION
The BDA-1819-60 is a bi-directional amplifier. It is designed to exchange radio
communications in buildings, basements, tunnels and other RF shielded environments.
The BDA improves the sensitivity of base stations in indoor locations where there is a
significant amount of cable loss in RF distribution systems. BDA-1819-60 operates in
designated PCS bands.
It contains two amplifiers providing amplification of RF signals in Up-link and Down-link
frequency bands. They are connected to the external cables via frequency selective
duplexers in order to attenuate all signals that are not in the designated bands.
TECHNICAL DESCRIPTION
The BDA-1819-60 bi-directional amplifier provides signal amplification in two separated
frequency bands in both directions between two coaxial connector terminals. It is achieved
by utilization of two frequency selective duplexers, which direct signals at two frequency
bands present at the common port in two outputs. These duplexers provide sufficiently
high isolation between two paths to prevent self-oscillation of the system. Detailed blockdiagram is shown in Figure 1.
The amplifier consists from several gain stages with the low noise stage at the input and
medium power stage at the output. All amplifier stages operate at class A linear regime in
order to provide the lowest possible intermodulation products.
The duplexer serves two purposes: it splits the signal from the common port to two
different ports, and it provides frequency selectivity and isolation between two paths. The
common port of the first duplexer is called “BASE STATION”. The common port of the
other duplexer is called “SERVICE AREA”.
Only signals within the frequency range of PCS corresponding Down-link of A-D, B, or
C band will be amplified coming from the BASE STATION port and only signals within
the corresponding Up-link band will be amplified from the SERVICE AREA port.
In this configuration the BDA amplifies signals in the Up-link band in one direction and
signals in the Down-link band in the other direction.
Physically the BDA block consists of a single compact unit with two RF connectors. It is
rugged and can be easily connected during cable installation. It has a moisture proof
NEMA 4X enclosure suitable for indoor and outdoor installation with two low noise
medium power amplifiers, optional independently controlled Up-link and Down-link
attenuators, two duplexers, and optional bias tee’s and AGC circuits.
The BDA can be powered by a conventional 110/220 VAC source using an external
power supply or alternatively DC voltage can be supplied to the BDA via an external DC
input or via center conductor of the RF coax cable.
Line Bi -Directional Amplifier
BLOCK DIAGRAM
B IA S TEE
R x/Tx D U PLEXE R
Rx
B PF
Tx
B PF
AM P
AM P
AC
Power
Supply
Variable
A ttenuator
Variable
A ttenuator
Variable attenuators
and AGC are optional
AM P
AM P
Tx
B PF
Rx
B PF
R x/Tx D U PLEXE R
B IA S TEE
Figure 1
Bias Tee’s are optional
INSTALLATION MANUAL
for
BI-DIRECTIONAL AMPLIFIERS
Communication Components Inc.
299 Forest Ave, Paramus, N.J. 07652
Tel: 201-265-8882,
Fax: 201-265-8922
TABLE OF CONTENTS
1. Theory of Operation
2. Technical Description
3. Installation Procedure
1. THEORY OF OPERATION
The BDA-1819-60 is a bi-directional amplifier. It. is designed to exchange radio
communications in buildings, basements, tunnels and other RF shielded environments.
The BDA improves the sensitivity of base stations in indoor locations where there is a
significant amount of cable loss in RF distribution systems.
It contains two amplifiers providing amplification of RF signals in Up-link and Down-link
frequency bands. They are connected to the external cables via frequency selective
duplexers in order to attenuate all signals that are not in the designated bands.
2. TECHNICAL DESCRIPTION
The BDA-1819-60 bi-directional amplifier provides signal amplification in two separate
frequency bands in both directions between two coaxial connector terminals. It is achieved
by utilization of two frequency selective duplexers, which direct signals at two frequency
bands present at the common port in two outputs. These duplexers provide sufficiently
high isolation between two paths to prevent self-oscillation of the system. Detailed blockdiagram is shown in Figure 1.
The amplifier consists from several gain stages with the low noise stage at the input and
medium power stage at the output. All amplifier stages operate at class A linear regime in
order to provide the lowest possible intermodulation products.
The duplexer serves two purposes: it splits the signal from the common port to two
different ports, and it provides frequency selectivity and isolation between two paths. The
common port of the first duplexer is called “BASE STATION”. The common port of the
other duplexer is called “SERVICE AREA”.
Only signals within the frequency range of 851-866 MHz band will be amplified coming
from the BASE STATION port and only signals within the frequency range of 806-821
MHz band will be amplified from the SERVICE AREA port.
In this configuration the BDA amplifies signals in the Up-link band in one direction and
signals in the Down-link band in the other direction.
Physically the BDA block consists of a single compact unit with two RF connectors. It is
rugged and can be easily connected during cable installation. It has a moisture proof
NEMA 4X enclosure suitable for indoor and outdoor installation with two low noise
medium power amplifiers, optional independently controlled Up-link and Down-link
attenuators, two duplexers, and optional bias tee’s.
The BDA can be powered by a conventional 110/220 VAC source using a built-in power
supply or alternatively DC voltage can be supplied to the BDA via an external DC input
or via center conductor of the RF coax cable.
Line
B i -D irectional A m plifier
B L O C K D IA G RA M
B IA S T E E
R x/T x D U P LE XE R
Rx
B PF
Tx
BPF
AM P
AC
Power
Supply
AM P
V ariab le
A tten uator
V ariab le
A tten uator
Variable attenuators
and AGC are optional
AM P
AM P
Tx
BPF
Rx
B PF
R x/T x D U P LE XE R
B IA S T E E
Figure 1
Bias Tee’s are optional
3. INSTALLATION PROCEDURE
3.1 INSPECTION
CAUTION
Use caution working with the bi-directional amplifier.
Disconnect the 115 VAC from the amplifier prior to
inspection.
Open the enclosure of the bi-directional amplifier (BDA) and carefully inspect the inside
assembly of the unit.
Verify that all components are properly secured to the base of enclosure, there are no lose
parts, and all interconnections are reliable.
3.2 SITE INSTALLATION
3.2.1 The bi-directional amplifier can be installed as a freestanding unit lying on the shelf
of the cabinet or any other adequately strong support. It can also be secured by screws to
the wall or rack using four holes in the tabs located at the back plate of the enclosure. It is
recommended that the environmental temperature will not exceed 65 C and the area will
be adequately ventilated.
3.2.2 Once amplifier is installed in place, open the front door and verify that all internal
parts are securely mounted.
3.2.3 Connect the ground wire to ground stud on the enclosure.
3.2.4 Plug in the AC cable into the AC socket to turn on the amplifier. The green light on
the enclosure must be lit on.
3.2.5 Connect spectrum analyzer to the input (donor antenna) cable. Measure the signal
level in the cable coming into the Down-link port of the amplifier. If the signal level is
above –36 dBm, add attenuator with the corresponding value or use internal attenuator, if
the BDA option is so equipped.
3.2.6 Repeat the same for the cable that will be connected to the Up-link port of the
amplifier.
3.2.7 Connect the spectrum analyzer via 20 dB pad to the Down-link port of the BDA.
Connect the “donor” side cable to the Up-link port of the BDA. Observe the level of the
amplified signals on the spectrum analyzer. Adjust the gain (if the BDA option is so
equipped) or external (internal, if so equipped) attenuator value to limit the power of the
signals to +28 dBm.
3.2.8 Repeat the same measurements connecting the spectrum analyzer to the Up-link
port and cable to the Down-link port. Adjust the level of amplified signals at the Up-link
port to +28 dBm.
3.2.9 Record the settings of attenuators.
3.2.10 Connect the Up-link cable to the amplifier. Check the security of the installation
and presence of the AC power. Amplifier is ready for operation.
3.3 REMOVE BI-DIRECTIONAL AMPLIFIER
3.3.1 Unplug the AC cord from the socket. AC light on the amplifier must be off.
Disconnect all coaxial cables.
3.3.2 Dismount amplifier from the wall or remove it from the shelf.
3.4 SHIPMENT AND STORAGE OF THE BDA
3.4.1 Use common technical shop practices to ensure equipment protection during
shipment or storage.
3.5 TROUBLESHOOTING AND FAULT DETECTION
WARNING!
110 VAC CAN BE LETHAL!
ALWAYS UNPLUG THE AMPLIFIER
BEFORE SERVICING THE INTERIOR.
3.5.1 Check the presence of the AC power. The AC light must be on.
3.5.2 Check the continuity of all connecting cables.
3.5.3 If the fault was not located, remove the amplifier and send it to the manufacturer for
repair.
3.5.4 RF testing of the amplifier is possible in the specially equipped laboratory.
3.6.0 INFORMATION TO USER
Any changes or modifications to this product as well as usage outside of specified
electrical parameters, which are not expressly approved by manufacturer, could void
the user’s authority to operate the equipment.
Drawing for FCC ID Label
3.0"
Communication Componets, Inc.
Model No: BDA-1819-60
FCC ID: NT3BDA-1819-60
1.0"

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