User Manual

Table Of Contents
Mission Valley Radio Repeater Equipment + Upgrade
User/Maintenance Handbook
Handbook No. 50-078021HBKM Page 54 of 85
5. MASTER SITE UPGRADE
5.1 Master Site Upgrade Rack Assembly (50-078021)
5.1.1 Master Site Upgrade Rack Description
This upgrade to the Mission Valley radio repeater system is concerned only with the 800MHz band of
frequencies, which, in the original specification could carry up to 24 channels of cell data
simultaneously. The added hardware for this upgrade will increase the number of available channels
from 24 to 43 but the number of 19” racks remains at three (the original 40W amplifier shelves will not
now be needed and three new channel module shelves will be added).
The cellular amplifier is in addition to the 24 channels already in existence, the increase (19 channels,
6 x 8ch. sub-racks) is designed to alleviate radio congestion to the local BTS and to extend the
number of possible simultaneous uses. Because of the increased channel density, a pair of 80-
100Watt power amplifier shelves (50-146703), instead of the original 40Watt pair, are the main source
of downlink RF power in the system to maintain the effective power/channel. Only the downlink path is
channelised, the uplink path is band-selective and its traffic is limited only by the total carrier power
available.
All shelves have active device alarms and these are configured as a volt-free, relay contact pair
summary per shelf, terminating in the 9-way ‘D’ connector on the rear panel, pins 1 & 2.
The VHF system needs no upgrade at this time, so the VHF hardware remains the same.
5.1.2 Master Site Upgrade Rack Electrical Specification
PARAMETER SPECIFICATION
855-869MHz (Downlink)
Frequency ranges:
810-824MHz (Uplink)
VSWR: better than 1.5:1
DC power supply: +24V
Power consumption: 600Watts
AC power input: 230V AC (nominal)
1 All amplifier shelves
Alarms Fitted:
(summary volt-free contacts)
2 PSU shelf
5.1.3 Master Site Upgrade Rack Mechanical Specification
PARAMETER SPECIFICATION
Height:
40U Swingframe cabinet (x1)
Width: 600mm
Rack
Depth: 600mm
operational: -20°C to +60°C Temperature
range
storage: -40°C to +70°C
Weight: >100kg
Humidity: 5 – 95% non-condensing
RF connectors: N type female
Environmental protection: IP44
Supply cable:
Unit supplied with suitable supply input
leads, connector and specified length of
cable