User's Manual

Weehawken Tunnel 900MHz Pager System
User/Maintenance Handbook
Handbook N.-Weehawken_900 Issue No:-A
Date:-05/08/05
Page:-
18 of 50
4. DOWNLINK PAGING AMPLIFIER
4.1 Two Channel 900MHz Pager Cell Enhancer (50-118501)
4.1.1 Two Channel 900MHz Pager Cell Enhancer Description
The pager cell enhancer provides two channels (downlink only) in the 900MHz band for the
NJ Transit system. These two frequencies are relayed to all the sites (leaky feeders) in the
system.
All amplifiers have built-in alarms which are configured as a summary, volt-free relay
contact pair terminating at pins 1 & 2 on the ‘D’ type alarm connector.
4.1.2 Two Channel 900MHz Pager Cell Enhancer Technical Specification
PARAMETER SPECIFICATION
929.5875MHz (Downlink)
Frequencies:
929.6125MHz (Downlink)
Gain: >90dB
Gain Adjustment: 0 - 30dB (in 2dB steps)
Shelf size: 4U
Uplink Power: >1.0Watts
Maximum uplink output: +30.8dBm
Downlink Power: >5.0Watts
Maximum downlink output power: +37.5dBm
Uplink +44dBm
IP3:
Downlink +50dBm
Downlink Ch. module AGC level: -17dBm
Uplink Ch. module AGC level: -8dBm
Noise Figure: <6dB (at maximum gain)
AGC: Fitted in channel modules
VSWR: better than 1.5:1
RF Connectors: N type, female
operational:
-10°C to +55°C Temperature
range:
storage:
-40°C to +70°C
Case: Alocrom 1200
Heatsinks: Matt black
Handles: Silver anodised alloy
Finish:
Fascia: Painted to RAL 7035
1 Downlink amplifiers
2 Uplink amplifiers
Alarms Fitted:
(volt-free contacts/TTL)
3 Each channel module