User's Manual

VHF Headstation & In-Line Amplifiers
User Handbook
Handbook Nō.-50-127201FCC Issue No:-A
Date:-14/06/2005
Page:-
11 of 45
2. OVERVIEW/SYSTEM DESCRIPTION
The Headstation BDA and the In-Line amplifier equipment is designed to be air interfaced
towards the local BTS and provide a single output to an LCX antenna cable.
Automatic gain control in both paths (channel selective module in downlink path has
internal AGC) keeps the signal level from overloading the amplifiers should a mobile be
operated close to the LCX antenna.
Alarms are provided for each amplifier and these terminate in a RS232 compatible digital
PCB with an output suitable for an off-air modem (as in this case) or a local PC running a
suitable terminal emulation program. The RS232 PCB is also capable of varying the gain
in each path via remotely switchable 0-30dB attenuators. This is in addition to the 0-30dB
of attenuation which is available locally.