RFI MINISYSTEM COMBINER MS1313-0205-SP User manual

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.

RF Input
The specified maximum input signal level should be observed to avoid damaging the Rx low-noise
amplifier (LNA).
Tx Inputs
Tx inputs from the network base stations use N (female) connectors. For optimum performance, 50
Ohm terminations should always be fitted to any unused Tx Input ports.
Rx Outputs
Rx outputs to the network base stations use BNC (female) connectors. For optimum performance,
50 Ohm terminations should always be fitted to any unused Rx Output ports.
Cabling and Connections
Please ensure that all cabling is installed using good quality cable types. For all RF cabling, double-
screened or solid-screen coaxial cable types are recommended for optimum performance. For
connection integrity, the use of coaxial adapters should be avoided. All coaxial, DC power and alarm
connectors should be checked for correct termination to their associated cables, Coaxial cable
connectors should be firmly tightened when cables are installed. DC and Alarm cable connectors
should have their securing screws used to ensure secure connector mating is maintained.
PIM Management
The antenna output of the MSC is a multi-carrier RF path. As such, good quality silver-plated
double-screened or solid-screen coaxial cable types, and appropriately rated lightning protection
devices and antennas are recommended for the reduction of Passive InterModulation (PIM).
Lightning Protection
A multi-carrier compatible lightning protector should be fitted to the antenna system connected to
the MSC. In conjunction with correctly installed Earthing, this lightning protection device will assist
in protecting the MSC, and the network base station equipment connected to it, from hazardous
and transient voltages.
OPERATION
Green Power LED
The green LED on the rear of the MSC is active when external power is present. If the green LED is
not illuminated then either there is no DC power present or the polarity is incorrect.
Red Fault LED
The red LED on the rear of the MSC will illuminate under the following circumstances;
•The DC input voltage is too low.
•The LNA’s internal amplifier currents are outside their normal operating range.
Operating Precautions
•There is no On/Off switch on the unit. It becomes active as soon as DC power is
connected or the AC plug pack is switched on at the AC outlet.
•Do not operate the unit outside its stated specifications.
•Do not open the MSC as there are no user-serviceable parts or adjustments inside. Faulty
equipment should only be repaired by qualified technical personnel – or returned to the
supplier for repair.
User Manual and Help
For more detailed information on the MiniSystem
Combiner (MSC), refer to the MiniSystem Combiner
User Manual - or contact your nearest Sales Office.
www.rfi.com.au
SPECIFICATIONS
Model MSxxxx-0y05-SP 1313 1314 1415 1516 1517 1616 1617
Frequency Range (MHz)
132-142
138-148
148-158
155-165
151-172
160-170
164-174
Tx Channel Capacity
≤2 (2 Channel Models) ≤4 (4 Channel Models)
Tx Input Power
≤50Watts
Tx Duty Cycle
≤100%
Tx-Tx Bandwidth
1.0MHz
Tx Insertion Loss
<6dB (2 Channel Models) <9dB (4 Channel Models)
Tx-Tx Isolation
>60dB typ.
Tx Input Return Loss
>20dB
Tx-Antenna Isolation
>50dB
Tx-Rx Separation
4MHz
min.
4MHz
min.
4MHz
min.
4MHz
min.
21MHz
min.
4MHz
min.
4MHz
min.
Tx-Rx Isolation
65dBmin. (70dB typ.)
Rx Channel Capacity
≤2 (2 Channel Models) ≤4 (4 Channel Models)
Rx-Rx Bandwidth
1.0MHz
Rx System Gain
0dB to 30dB (in 1dB steps)
Rx-Rx Isolation
>18dB
Rx LNA Noise Figure
1.2dB typ.
Rx Max. RF Input Level
-10dBm
Rx Output Return Loss
>20dB
Impedance
50 Ohms
Alarms
DC Supply Voltage Low, Rx LNA Fail
Alarm Outputs
Dry Relay Form-C (N.C. / N.O. / CMN)
Alarm Relay Ratings
50VDC 1A max.
RF Connectors
Tx = N (female) Rx = BNC (female) Antenna = N (female)
DC Connector
2pin 5mm Phoenix (mating plug supplied)
Alarm Connector
3pin 5mm Phoenix (mating plug supplied)
Enclosure
7RU 19in Rack Mount (Black)
DC Power Requirements
+11VDC to +28VDC 3.5W typ. (polarity protected)
Grounding
5mm and 6mm stainless steel studs
IP Rating
Indoor Use Only
Operating Temperature
-30° to +60°C-122° to +140°F
Dimensions (HxWxD)
133x483x430mm 5.23x19x17in
Weight
18.5Kg / 40.7lbs (2 Channel Models) 22.5Kg / 49.5lbs (4 Channel Models)
Notes: xxxx in the model number denotes the frequency sub-band. (i.e. ‘1516’ = 156 to 166MHz)
yin the model number denotes the channel capacity. (i.e. 2 = ‘2’ Channel, ‘4’ = 4 Channel)