User Manual

BDA 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 “Power On” lamp. The metal enclosure of the BDA is connected to ground.
A 7-pin reverse bayonet connector provides failure alarm output contacts (see diagrams
on page 8) as well as a 12 VDC (250mA) auxiliary output.
For S1 Option: The BDA is equipped with both AC and DC voltage inputs for power
operation. This gives the flexibility of powering the BDA with either an AC or DC source. If
both sources are connected, the BDA will automatically select the stronger source for
power. NOTE: (To insure that the DC source will be selected when both sources are
connected, DC input voltage must be at least 27 VDC.)
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 facing the area to be
covered by the BDA. (Four additional “N” female connectors are included with the
External filter option.)
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.
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