User's Manual

Weehawken Tunnel VHF Repeater System
User/Maintenance Handbook
Handbook N.-Weehawken_VHF Issue No:-A Date:-05/08/05
Page:-
19 of 75
4. BAND SELECTIVE VHF CELL ENHANCERS
4.1 VHF Simplex BDA (55-154701)
4.1.1 VHF Simplex BDA Description
The simplex shelves are part of the VHF amplification and have crystal filters instead of
bandpass filters to set bandwidths. There are two downlink bands and three uplink bands, the
downlink paths having isolators fitted to each of the 5Watt output stages to prevent two
outputs from interfering with each other. 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.
Note that the control circuitry is omitted from the system diagram for reasons of clarity and
simplification.
4.1.2 VHF Simplex BDA Electrical Specification
PARAMETER SPECIFICATION
153.75-155.3MHz (Downlink1)
159.0-161.0MHz (Downlink2)
153.75-155.3MHz (Uplink1)
158.85-159.3MHz (Uplink2)
Frequency range:
161.5-162.0MHz (Uplink)
Gain: >90dB
Gain Adjustment: 0 – 15dB (in 1dB step)
Uplink Power: >5.0Watts
Downlink Power: >5.0Watts
Uplink +48dBm
IP3:
Downlink +48dBm
Noise Figure: <6dB
AGC level: -2dBm (uplink & downlink)
23dB (downlink)
Channel module gain:
24dB (uplink)
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
1 U/L amplifiers
2 D/L amplifiers
Alarms Fitted:
(volt-free contacts/TTL)
3 Channel module