9
RF Antenna Connections
TX and RX antennas are connected to two separate
connectors (shown in the rear panel view), and there
must be adequate isolation of 75 dB UHF or 85 dB VHF
between them. If only one antenna through a duplexer
is connected, at least 75 dB UHF or 85 dB VHF isolation
between the TX and RX antenna ports is required.
Caution: Please ensure that all power is switched off
before disconnecting the TX antenna.
Caution:
1.Before you make the connection, ensure the DC
power supply or battery backup system is capable of
supplying a minimum of 200W, and check if the DC
power supply has current limit. Since high current
consumption is required for transmitting, improper
setting of the current limit may cause transmission
failure.
2.The repeater is to be connected to a battery
that is in accordance with applicable electrical
regulations for the end use country. If battery power
is exhausted, you are recommended to charge the
battery with an external charger. Remove the battery
from the repeater when charging.
Caution: It is important that all antenna cables are
grounded at the point they enter the building. All
aspects of the antenna design must comply with the
relevant local regulations.
Electrical Connections
1. Duplexer Selection
The selection of duplexer is critical to system performance.
The use of a notch (band reject) duplexer is possible in
some systems that are not located at high RF density
sites. If the repeater is used in high RF density sites, the
use of a pass-notch duplexer is recommended.
The duplexer must be able to handle at least 50W
continuously. For the best system performance, the
insertion loss should be less than 2dB.
2. Antenna Selection
The selection of antenna is also critical to system
performance. The selected antenna must be 50 Ohm
impedance and capable of at least 50W. High gain
antennas may be used to increase system coverage.
Please take note of licensing restrictions when selecting
high gain antennas. Some services or regions may have
antenna gain or system radiation limitations.
The antenna must be connected to the duplexer with
a high grade 50 Ohm transmission line (e.g. Andrew
HELIAX cables). The line must have connectors to match
the connectors on the duplexer and antenna.
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