User Manual

PBL UHF 1 & 2 Air Interface
Maintenance Handbook
H/book Number:-60-055900HBKM
Issue No:-1
Date:-13/02/2003
Page:-68 of 68
5.2.8 DC/DC Converter, 24V in, 12V 8A out (13-003011) See section 5.1.7
5.2.9 Chan. Selec. & Chan. Contr. Mdls (17-003012 & 17-002101) See section 5.1.8
5.2.10 21MHz IF Filter Board (17-002502)
5.2.10.1 Description
The above channel selective modules are fitted with a 21MHz filter board to narrow the
channel bandwidth from 30kHz to 15kHz.
5.2.11 Single & Dual 24Volt Relay Boards (20-001602 & 80-008902) See section 5.1.9
5.2.12 SMA Coaxial Termination (93-930003) See section 5.1.10
5.2.13 24V 400W Flat-Pack Power Supply (96-300011) See section 5.1.11
5.2.14 JWS75-15/A PSU (96-300045)
5.2.14.1 Description
The power supply unit is a switched-mode type capable of supplying 24V DC at 6.25Amps
continuously. This PSU is used to provide power for the fibre optic modules which will
typically require approximately 3.0 Amps 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 24.5V.
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.
5.2.14.2 Technical Specification
AC Input Supply:
Voltage: 110 or 220V nominal
90 to 132 or 180 to 264V
(absolute limits)
Frequency: 47 to 63Hz
DC Output Supply:
Voltage: 24V DC (nominal)
22 to 26V (absolute limits)
Current: 6.25A