User's Manual

800MHz Tetra Repeater
User Handbook
Handbook Nō.-55-151501HBK Issue No:-A
Date:-22/04/2005
Page:-
11 of 31
2. SYSTEM OVERVIEW
The AFL Band Selective Cell Enhancer is a 2-way on-band repeater. Various models are
available to cover frequency bands from 50MHz to 3000MHz with power levels up to 100Watts.
Its main sphere of applications is in urban areas where the topology is such that shadows occur in
the propagation pattern (for example within large buildings, conference centres and tunnels, etc.)
The Band Selective Cell Enhancer is a 2-port device for direct connection to two antennas,
usually a highly directional Yagi or similar aligned towards the base (donor) site and an omni-
directional or leaky feeder antenna to cover the mobiles. The frequency bands that are passed by
the Cell Enhancer are set as per the specific customer requirements.
Each active module carries its own volt-free, alarm relay contact interface which may be easily
integrated into any such summary system. A comprehensive range of RS232/422 computer
controlled alarms/monitors for band selective and channelised systems is also available.
AFL manufacture a wide range of Cell Enhancers, configured for each customer's specific
requirements. Two basic physical variants are available, a rack mounted version to fit in a
standard 19" rack and an environmentally sealed wall mounted version which requires no further
enclosure.
The rack-mounted version is usually supplied in 3 units, a power supply unit and 2 RF units (one
containing each path). Each unit has a ‘D.C. on’ indicator on the front panel and the PSU also has
an ‘A.C. on’ indicator.
The wall-mounted version is supplied in a single environmentally-protected case. Handles are
provided for carrying the unit and the door is fitted with locks. A supply isolator switch is fitted
inside the unit and there are D.C. and Alarm on indicators on the outside of the door.