User Manual

5 Ch. VHF Radio Repeater Equipment
Document Number 50-189201HBK – Issue 1 Page 13 of 48
4.3. BDA VHF Downlink Output Combiner (50-189208)
The BDA VHF Downlink Output Combiner takes amplified signals from the Channelised Amplifier
shelves in Rack 1 and combines them before passing the signals to the Cavity Combiner in rack 2
Channels 1 and 2 are combined by hybrid combiner (01-004201) and the resultant signal is passed
through two notch filters (01-004201) before leaving the shelf to go to the cavity combiner in rack 2
Channels 3 and 5 are combined by hybrid combiner (01-004201) and the resultant signal is passed to
the cavity combiner in rack 2
Channel 4 is passed through two notch filters (01-004201) before leaving the shelf to go to the cavity
combiner in rack 2
This is a passive shelf and has no connection to the PSU and no alarms.
4.3.1. BDA VHF Downlink Output Combiner (50-189208) Major
Components
Component
Part
Component Part Description Qty Per
Assembly
01-004201 Notch Filter 4
05-000103 Hybrid combiner 2
97-100010K 5U Rack Mount Chassis
A Port E2 Combined D/L Channel 1 & 2 output
B Port B5 D/L Channel 5 input
C Port B3 D/L Channel 3 input
D Port B1 D/L Channel 1 input
E Port E3 Combined D/L Channel 3 & 5 output
F Port E1 D/L Channel 4 output
G Port B4 D/L Channel 4 input
H Port B2 D/L Channel 2 input