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CONNECTIONS:
The BDA AC power is accepted through a standard 3-wire male plug (IEC-320) with
phase, neutral and ground leads. The AC power is wired to a high efficiency DC switching
power supply which is CE and UL approved. The power supply runs the amplifiers and
the LED indicators. The metal enclosure of the BDA is connected to ground.
A 9-pin circular connector provides failure and Oscillation Detect alarms output dry
contacts, Normally Open and Normally Closed (see diagrams on page 8).
The RF connections are made via two type “N” female connectors. The RF connector
labeled “BASE” must be connected to the antenna pointing towards the base station.
The RF connection labeled “MOBILE” must be connected to the antenna / passive
DAS facing the area to be covered by the BDA.
The RF connections must be made through cables with characteristic impedance of
50 ohms.
The isolation between the base station antenna and the mobile antenna should
be at least 12 dB higher than the BDA gain. Isolation less than this value can
cause gain ripple across the band. Isolation equal to or less than the BDA gain
will give rise to oscillations which will saturate the amplifiers and possibly
cause damage to the BDA.
Optional Features:
OCAG: Automatic Gain Reduction
This option protects the BDA from oscillation due to service upgrades. Should the
input RF signal increase due to a service upgrade, the unit will detect potential
oscillation and automatically drop the system’s gain by 30 dB, preventing interference
until a service technician adjusts the system (antenna separation, location etc.)
ODSC / ODSCRM7
To minimize interference with other RF systems, this unit includes an Oscillation
detection module that continuously monitors the BDA operation, in a case of
Oscillation detection inside the BDA, the detector will shut down all the amplifiers to
avoid RF interference with other systems in the area, when the Oscillation condition
passes or is resolved, the ODSC operation will turn on all the amplifiers, returning to
regular operation. The ODSCRM7 module will allow Oscillation detect / display &
shutdown of all amplifiers with remote monitoring via 9-Pin connector. A red LED
located on the front panel (see figure 3) illuminates when OSC is detected.
