2 Channel MiniSystem Combiner Interconnection
Tx #1
Tx/Rx
Antenna
Alarm
Power
MiniSystem
Combiner
Tx/Rx
Antenna
DC or AC Power
Plug Pack
Lightning Surge
Protector
DC In
AC In
To Site Alarm Management System
Ground
Tx #2
Rx #1
Rx #2
Base Station #1
Base Station #2
Tx
Tx
Rx
Rx
Duplexer
Rx
Tx
4 Channel MiniSystem Combiner Interconnection
Tx #1
Tx/Rx
Antenna
Alarm
Power
MiniSystem
Combiner
Tx/Rx
Antenna
DC or AC Power
Plug Pack
Lightning Surge
Protector
DC In
AC In
To Site Alarm Management System
Ground
Tx #2
Tx #3
Tx #4
Rx #1
Rx #2
Rx #3
Rx #4
Base Station #1
Base Station #2
Base Station #3
Base Station #4
Tx
Tx
Tx
Tx
Rx
Rx
Rx
Rx
Duplexer
Rx
Tx
INS-41925-2 © 2014 R F Industries Pty. Ltd.
MINISYSTEM COMBINER
INTRODUCTION
The MiniSystem Combiner (MSC) is a compact combining solution for applications requiring RF
combining for 1-4 channels. The MSC is compatible with analogue and digital technologies and may
be used in applications including PMR, Links, DMR, Network Sites, Telemetry, DPMR, In-Plant,
TETRA, Voice, Remote Sites, Conventional, Data and Trunking.
The individual transmit (Tx) and receive (Rx) ports of the connected network base stations are
combined in the MSC, and then connected by a high performance bandpass duplexer to a single
Tx/Rx antenna port. An innovative hybrid combiner design is used in the MSC Tx path, with dual
stage high-power isolators providing excellent Tx-Tx isolation for the suppression of intermodulation
(IM). In the MSC Rx path, a low-noise amplifier (LNA) provides excellent linearity and output
Intercept (3OIP) performance to optimise network receive sensitivity and performance.
INSTALLATION
Mounting
The MSC is to be mounted indoors only. It is designed to fit in a 7RU 19inch rack mount space and
should be mounted clear of any equipment that generates excessive heat. Do not mount the unit
inside small unventilated enclosures.
Frequencies
Check that the required operating frequencies are compatible with the MSC model and the
duplexer’s Tx and Rx passband frequencies.
DC Power
Power the MSC from any convenient external supply that can provide the appropriate voltage and
current. The DC power input is reverse polarity protected.
AC Power
The optional AC plug pack is supplied with a two pin Phoenix plug. The plug pack should be
mounted safely in a convenient location and clear of any equipment or obstructions which may
cause it to overheat.
Alarm Connector
A three pin Phoenix plug is provided to connect the alarm relay to external alarm monitoring
equipment if desired. Under normal operating conditions the alarm output pins marked NC and
CMN are closed. If a fault occurs, or power is disconnected, these pins open.
Earthing
Compliance with international electrical safety standards requires that the external
Protective Earthing point on this equipment, as indicated by this symbol, be permanently
hardwired to the premise’s protective earth system using a 1.5mm² (14AWG) minimum
cross-sectional area conductor. This provides protection from hazardous and transient voltages.
