User Manual

STTRS DOCUMENTATION
Document Number 80-330501HBKM – Issue A - Draft Page 448 of 500
24.3. International Station 700MHz BDA (80-330558-1) Major Components
24.3.1. 4 Port Hybrid Coupler (05-003007)
This transmitter hybrid coupler 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
insertion losses are kept to a minimum. Any unused ports should be terminated with an appropriate
50Ω load. In this specific instance one port of 4 Port Hybrid Coupler (05-003007) is terminated with
Dummy load 09-000401 (see below).
05-003007 Specification
PARAMETER SPECIFICATION
Frequency range 700-900MHz
Bandwidth 200MHz
Rejection >14dB
Insertion loss 6.5dB (in band, typical)
Connectors SMA
Weight <1.0kg
operational -10%C to +60%C Temperature
range
storage -20%C to +70%C
24.3.2. Dummy Load (09-000401)
When a combiner system is used to split or combine RF signals, in many cases it is most cost
effective to use a standard stock item 4, 6 or 8 port device where, in fact, only a 3 - 6 port device is
needed. In this case the splitter/combiner module has one of its ports terminated (both uplink &
downlink) with an appropriate load in order to preserve the correct impedance of the device over the
specified frequency range. This has the advantage of allowing future expansion capability should
extra channels or other functions become necessary.
09-000401 Specification
PARAMETER SPECIFICATION
Frequency Range 10 - 1000 MHz
Power Rating 60 watts continuous
VSWR Better than 1.1:1
Impedance 50 Ohms
Temperature Range -20 to +60°C
RF Connectors N Type female
Dimension 119mm x 51mm x 51mm
Weight 485grams
Finish Black Anodised
MTBF >180,000 hours