User's Manual

800MHz & VHF Cell Enhancers
Maintenance Handbook
H/book Number:-50-078001HBKM
Issue No:-
A
Date:-02/09/2004
Page:-
80 of 88
5.29 STPS12045TV 60A Dual Diode Assembly (94-100004)
5.29.1 Description
The purpose of these dual diode assemblies is to allow two (or more) DC voltage sources to
be combined, so that the main 12 or 24 volt DC rail within the equipment is sourced from
either the mains driven flat-pack, or externally through an XLR connector on the rear panel.
The heavy-duty diodes prevent any reverse current from flowing back to their source or the
alternative supply rail. Combining diodes such as these will also be used if the equipment is
to be powered from external back-up batteries.
5.30 15V Switch-Mode PSU (96-300054)
5.30.1 Description
The power supply unit is a switched-mode type capable of supplying 15V DC at 27Amps
continuously. The amplifiers in this unit will draw approximately 20-22Amps at 24V DC,
so the PSU will be used conservatively ensuring a long operational lifetime.
No routine maintenance of the PSU is required. If a fault is suspected, then the output
voltage from the power supply may be measured on its output terminals. This is typically
set to 15.2V. The adjustment potentiometer will be found close to the DC output
terminals.
All the PSU’s used in AFL Cell Enhancers are capable of operation from either 110 or
220V nominal AC supplies. The line voltage is sensed automatically, so no adjustment or
link setting is needed by the operator.
5.30.2 Technical Specification
AC Input Supply:
110 or 220V nominal
Voltage:
90 to 132 or 180 to 264V
(absolute limits)
Frequency: 47 to 63Hz
DC Output Supply:
15V DC (nominal)
Voltage:
12.5-17V (absolute limits)
Current: 27.0A