INSTALLATION GUIDE FOR RX-1839
ENU STATUS : 1-0-0
Copyright - refer to title page
Page 11
2.2
EQUIPMENT LAYOUT
Shown below is the internal layout of the RX-1839.
Modem
PSU
DL PA
Door Open Switch
MT Port Integrated
Duplexer
DT Port
Integrated
Duplexer
Li-ion Battery
Surge Arrestor
Digital Integrated Module
MT
DT
RS-485
AC OUT
Power
EXT_ALM
MODEM ANT
UL PA
A
LC
V
gs
1
V
gs
2
R
F I
N
R
F O
U
T
Figure 3: Layout of the RX-1839
2.3
EQUIPMENT CONSTITUTION
The typical RX-1839 unit consists of the following components:
Power Amplifier (PA):
It fulfils power amplification in both UL and DL branches.
Main Control Unit (MCU):
The MCU is used to monitor and control the operation of the repeater. It also
provides the communication interface for remote control and indication. LED indicators provide the
operation status of the MCU.
Integrated Duplexer:
The DPX is located towards the DT and MT terminals and permits the uplink and
downlink signals to share a common antenna.
Digital Integrated Module
: Consists of Power Conversion module, RF module, digital process module and
monitoring module. Power Conversion module co28V DC voltage in to +9VJK and +9VRF. +9VJK,
+9VRF are supplied to monitoring unit and RF unit in integrated module separately. RF module amplifies
and converts the RF signal to IF signal. Digital process module converts the IF signal into baseband signal
via AD conversion and extraction, filtering. After that, IF signal will be amplified and converted to RF signal
by RF module for RF filtering and amplification. Monitoring module monitors and controls the system
parameters and is the interface of both remote monitoring and local commissioning.
Power Supply Unit (PSU):
The PSU converts the input voltage into a stable DC to provide power for the
internal functional modules and to charge the internal Li-ion battery.
Surge Arrestor:
The AC Mains surge arrestor is mounted next to the PSU and has three connections: VAC
Live, Neutral and Ground. This provides protection to the PSU. It is assumed that the antenna system will
have ample lightning protection.
Note: When the equipment is DC powered, no surge arrestor is required.
