User Manual

STTRS DOCUMENTATION
Document Number 80-330501HBKM – Issue A - Draft Page 285 of 500
16.4.3.3. 900MHz Splitter/Combiner (05-002602)
The Splitter/Combiner used is a device for accurately matching two or more RF signals to single or
multiple ports, whilst maintaining an accurate 50Ω load to all inputs/outputs and ensuring that the
VSWR and insertion losses are kept to a minimum. Any unused ports should be terminated with an
appropriate 50Ω load.
Being passive devices, the splitters should have an extremely long operational life and require no
maintenance. Should a unit be suspect, it is usually most time efficient to replace the whole module
rather than attempt repair or re-tuning.
05-002602 Specification
PARAMETER SPECIFICATION
Narrowband: 815 – 960MHz Frequency
range:
Broadband: 800 – 1200MHz
Narrowband: 145MHz
Bandwidth:
Broadband: 400MHz
Input ports: 1
Output ports: 2
Narrowband: 3.3dB
Insertion loss:
Broadband: 3.5dB
Return loss input & output: 1.3:1
Impedance: 50Ω
Narrowband: >20dB
Isolation:
Broadband: >18dB
MTFB: >180,000 hours
Splitting: 20Watts
Power rating:
Combining: 0.5Watt
Connectors: SMA female
Weight: 200g (approximately)
Size: 54 x 44 x 21mm
16.4.3.4. Wideband Asymmetric Coupler (07-015102)
The purpose of Wideband Asymmetric Coupler (07-015102) is to tap off a known portion (in this case
10dB) of RF signal from transmission lines and to combine them, for example through splitter units for
different purposes (alarms/monitoring etc.), whilst maintaining an accurate 50Ω load to all
ports/interfaces throughout the specified frequency range. They are known formally as directional
couplers as they couple power from the RF mainline in one direction only.
07-015102 Specification
PARAMETER SPECIFICATION
Frequency Range 800 - 2500 MHz
Coupling Value 10 dB ± 1.0 dB
Main Line Insertion Loss <1.6 dB
VSWR 1.4:1
Directivity >18 dB
Power Rating 200 Watts
RF Connectors ‘N’ female
operation
-20°C to +60°C
Temperature
range
storage
-40°C to +70°C