User's Manual

800MHz Tetra Repeater
User Handbook
Handbook Nō.-55-151501HBK Issue No:-A
Date:-22/04/2005
Page:-
13 of 31
3.1 Description
The 800MHz Tetra band selective (no channelisation) tunnel amplifier is directly connected
to an air interface antenna directed towards the base station and a leaky feeder antenna to
cover the mobiles in the tunnel. The downlink power is 20Watts, provided by a single power
amplifier, and the uplink power device is a single 5W amplifier, which is sufficient power for
ample communications with the base station.
Automatic gain control is featured in both paths to prevent overloading of the input stages
should a mobile be operated close to the antennas.
An alarm system is in-built into each amplifier to warn of functionality disorders and this is
output from the system as a summary, volt-free relay contact pair suitable for integration with
any existing loop arrangement.
3.2 Technical Specification
PARAMETER SPECIFICATION
866-894MHz (downlink)
Frequency range:
821-849MHz (uplink)
Bandwidth: 28MHz
Gain: >85dB
Gain Adjustment: 0 - 30dB (in 2dB steps)
Uplink Power: >5.0Watts
Downlink Power: >20.0Watts
+40dBm (downlink)
Third order intercept point:
+54dBm (uplink)
+41.5dBm (downlink)
1dB compression point:
+35.5dBm (uplink)
Downlink: +40dBm
AGC:
Uplink: +34dBm
Noise Figure: <6dB
VSWR: better than 1.5:1
RF Connectors: N type, female
operational:
-10°C to +60°C
Temperature range:
storage:
-40°C to +70°C
Alarms Fitted:
(volt-free contacts/TTL)
1 Amplifiers