Handbook

PBL UHF1/1A 1 & 2 Air Interface
Maintenance Handbook
H/book Number:-60-055900HBKM
Issue No:-2
Date:-20/10/2003
Page:-
66 of 85
5.1.10 SMA coaxial termination (93-930003)
5.1.10.1 Description
When a combiner system is used to split or combine RF signals, in many cases it is most
cost effective to use a standard stock item 4, 6 or 8 port device where, in fact, only a 3 - 6
port device is needed. In this case the splitter/combiner module has one of its ports
terminated (both uplink & downlink) with an appropriate load in order to preserve the
correct impedance of the device over the specified frequency range. This has the advantage
of allowing future expansion capability should extra channels or other functions become
necessary. Terminations are available for every type of RF connector that may be used, N
type, 7/16
th
or SMA, in this case SMA.
5.1.11 24V 400W Flat-Pack Power Supply (96-300011)
5.1.11.1 Description
The power supply unit is a switched-mode type capable of supplying 24V DC at
16.0Amps continuously. Equipment of this type typically requires approximately 10.0
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. No drawings of the PSU are available.
5.1.11.2 Technical Specification
AC Input Supply:
Voltage: 110 or 220V nominal - 90 to 132 or 180 to
264V (single phase, absolute limits)
Frequency: 47 to 63Hz
DC Output Supply:
Voltage: 24V DC (nominal), 22 to 26V
(absolute limits)
Current: 16.0A
operational:
-10ΒC to +55ΒC
Temperature
range:
storage:
-40ΒC to +70ΒC