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 87 of 148
Downlink Output Shelf
80-301408
F
G
A
B
C
D
E
07-018005
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
4.6. Downlink Output Shelf 80-301408
Downlink Output Shelf 80-301408 is part of the main Splitter/Combiner assembly. Signals are
received from the various amplification stages and then combined into a single signal which is output
to the radiating cable. The unit is housed in a 4U, 19” rack mount case which is mounted in Rack 2
Ports labelled A to D (Annotated A to D in section 4.6.4.1.) are the Downlink inputs from the
amplification stages.
The Downlink signal leaves the Downlink Output Shelf 80-301408 for the radiating cable via the port
labelled “DOWNLINK OUTPUT” (F in section 4.6.4.1.) and there is a 30dB test port labelled
“DOWNLINK OUTPUT TEST PORT” (G in section 4.6.4.1.).
Downlink Output Shelf 80-301408 also incorporates bandpass filtering for the three UHF bands, the
filters are placed in the RF path before the outputs to the radiating cable.
4.6.1. Downlink Output Shelf 80-301408 System Schematic
A Port A. Downlink VHF Input from VHF Amplifier Shelf 80-301409
B Port B. Downlink UHF Lowband Input from UHF Lowband Amplifier Shelf 80-301410
C Port C. Downlink UHF Midband Input from UHF Midband Amplifier Shelf 80-301410
D Port D. Downlink UHF Highband Input from UHF Highband Amplifier Shelf 80-301410
E Port E. Downlink 800MHz Input from 800MHz Amplifier Shelf 80-301411
F Downlink Output to Radiating Cable
G Downlink Output Test Port (30dB Tap)