User Manual

Axell Wireless Limited
Technical Literature
L.A. M.T.A. Remote Sites
Document Number 80-301401HBKM Issue No. 1 Date 13/06/2008 Page 81 of 148
Downlink Input Shelf
80-301407
A
B
C
D
E
F
G
07-022005
07-004815
07-005745
02-010701
460.4 to 450.5MHz
02-010701
482.5 to 483.8MHz
02-010901
507.0 to 507.3MHz
4.5. Downlink Input Shelf 80-301407
Downlink Input Shelf 80-301407 is part of the main Splitter/Combiner assembly. Signals are received
from the radiating cable and are then split into their various separate paths before being amplified by
external band specific amplifiers The unit is housed in a 4U, 19” rack mount case which is mounted in
Rack 1
Downlink signals are received at the port labelled “DOWNLINK INPUT” (Annotated A in the picture in
section 4.5.4.1.) and there is a 30dB test port labelled “DOWNLINK INPUT TEST PORT” (B in section
4.5.4.1.).
Ports labelled 1 to 5 (C to G in section 4.5.4.1.) are the Downlink outputs to the amplification stages.
Downlink Input Shelf 80-301407 also incorporates bandpass filtering for the three UHF bands, the
filters are placed in the RF path before the outputs to the external amplification stages
4.5.1. Downlink Input Shelf 80-301407 System Schematic
A Downlink Input from leaky Feeder
B Downlink Input Test Port (30dB Tap)
C Port 1. Downlink VHF Output to VHF Amplifier Shelf 80-301409
D Port 2. Downlink UHF Lowband Output to UHF Lowband Amplifier Shelf 80-301410
E Port 3. Downlink UHF Midband Output to UHF Midband Amplifier Shelf 80-301410
F Port 4. Downlink UHF Highband Output to UHF Highband Amplifier Shelf 80-301410
G Port 5. Downlink 800MHz Output to 800MHz Amplifier Shelf 80-301411