Communication Components BDA-1819-60 BI-DIRECTIONAL AMPLIFIER User Manual

Communication Components Inc BI-DIRECTIONAL AMPLIFIER MANUAL TECH DESC LABEL FORMAT BLK DIAGRAM

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Contents

MANUAL TECH DESC LABEL FORMAT BLK DIAGRAM

THEORY OF OPERATIONThe BDA-1819-60 is a bi-directional amplifier. It is designed to exchange radiocommunications in buildings, basements, tunnels and other RF shielded environments.The BDA improves the sensitivity of base stations in indoor locations where there is asignificant amount of cable loss in RF distribution systems. BDA-1819-60 operates indesignated PCS bands.It contains two amplifiers providing amplification of RF signals in Up-link and Down-linkfrequency bands. They are connected to the external cables via frequency selectiveduplexers in order to attenuate all signals that are not in the designated bands.
TECHNICAL DESCRIPTIONThe BDA-1819-60 bi-directional amplifier provides signal amplification in two separatedfrequency bands in both directions between two coaxial connector terminals. It is achievedby utilization of two frequency selective duplexers, which direct signals at two frequencybands present at the common port in two outputs. These duplexers provide sufficientlyhigh isolation between two paths to prevent self-oscillation of the system. Detailed block-diagram is shown in Figure 1.The amplifier consists from several gain stages with the low noise stage at the input andmedium power stage at the output. All amplifier stages operate at class A linear regime inorder to provide the lowest possible intermodulation products.The duplexer serves two purposes: it splits the signal from the common port to twodifferent ports, and it provides frequency selectivity and isolation between two paths. Thecommon port of the first duplexer is called “BASE STATION”. The common port of theother duplexer is called “SERVICE AREA”.Only signals within the frequency range of PCS corresponding Down-link of A-D, B, orC band will be amplified coming from the BASE STATION port and only signals withinthe 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 andsignals in the Down-link band in the other direction.Physically the BDA block consists of a single compact unit with two RF connectors. It isrugged and can be easily connected during cable installation. It has a moisture proofNEMA 4X enclosure suitable for indoor and outdoor installation with two low noisemedium power amplifiers, optional independently controlled Up-link and Down-linkattenuators, two duplexers, and optional bias tee’s and AGC circuits.The BDA can be powered by a conventional 110/220 VAC source using an externalpower supply or alternatively DC voltage can be supplied to the BDA via an external DCinput or via center conductor of the RF coax cable.
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Document ID38056
Application IDnQwX07equehLsJ4Fy7rodA==
Document DescriptionMANUAL TECH DESC LABEL FORMAT BLK DIAGRAM
Short Term ConfidentialNo
Permanent ConfidentialNo
SupercedeNo
Document TypeUser Manual
Display FormatAdobe Acrobat PDF - pdf
Filesize5.03kB (62874 bits)
Date Submitted1999-05-18 00:00:00
Date Available1999-10-26 00:00:00
Creation Date2001-06-25 13:53:04
Producing SoftwareAcrobat Distiller 4.0 for Windows
Document Lastmod2001-06-25 13:53:05
Document TitleMANUAL TECH DESC LABEL FORMAT BLK DIAGRAM
FCC ID Filing: NT3BDA-1819-60

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