User Manual

5 Ch. VHF Radio Repeater Equipment
Document Number 50-189201HBK – Issue 1 Page 37 of 48
6. BDA VHF SYSTEM RACK 3 (50-189214)
Rack 3, the Uplink Cavity Combiner comprises two stages.
Stage 1 takes the uplink feed from Hybrid Splitter/Combiner Tray (50-189211) in Rack 2 and by
means of critical length harnesses splits the signal into three paths, each path is then fed through a
chain of two cavity filters before being fed to the Uplink Input Splitter (50-189210) In rack 1
Stage 2 receives the three uplink signals from Uplink Output Combiner (50-189209) and by means of
critical length harnesses, combines the signals into a single path which is then routed through a
Bandpass Notch Filter before being fed to the TX antenna
Rack 3 is a 43U equipment mounting rack (600mm x 600mm) and comprised of the following
modules, listed from the top of the rack
Component
Part
Component Part Description Qty Per
Assembly
01-003105 Bandpass Notch Filter 1
04-000213 VHF Cavity Resonator 12