User's Manual

Weehawken Tunnel VHF Repeater System
User/Maintenance Handbook
Handbook N.-Weehawken_VHF Issue No:-A Date:-05/08/05
Page:-
57 of 75
7.8 3 Stage Alarm/Simplex/Mute PCB (12-002213)
7.8.1 Description
In systems using simplex channel switching, it is necessary to be able to distinguish between
a ‘normal’ switching operation and erroneous modes where faults in the detector circuitry
may cause data errors but not necessarily fire the alarms. The simplex alarm/mute board is
designed to differentiate between normal and spurious switching signals for single or
multiple stage amplifiers.
7.9 5Watt Low Power Amplifier (12-004902)
7.9.1 Description
The low power amplifier used is a triple stage solid-state low-noise amplifier. Class AB
circuitry is used in the unit to ensure excellent linearity over a very wide dynamic range. The
three active devices are very moderately rated to provide a long trouble-free working life. There
are no adjustments on this amplifier, and in the unlikely event of failure then the entire amplifier
should be replaced.
7.9.2 Technical Specification
PARAMETER SPECIFICATION
Frequency range: 80-260MHz
Bandwidth: 20MHz (tuned to specificati
o
Maximum RF output: >5.0 Watt
Gain: 40dB
1dB compression point: +34dBm
3
rd
order intercept point: +44dBm
Noise Figure: <2.4dB
VSWR: better than 1.5:1
Connectors: SMA female
Supply: 500mA @ 24V DC
operational:
-10°C to +60°C
Temperature
range:
storage:
-20°C to +70°C
Weight: 0.5 kg
Size: 167 x 52 x 25mm