Codan Radio MT-4E Paging - Manual (Page 35)

MT-4E PAGING SYSTEMS | USER GUIDE
Chapter 3: MT-4E Paging System Components Page 27
SYSTEM REGULATOR
The SM-3 system regulator is a plug-in module which provides voltage regulation, system metering and
audio monitoring for an MT-4E paging system. The SM-3 includes the following features:
• High current +9.5 Vdc voltage regulator with an anti-latchup hysteresis circuit.
• Front panel switch selectable meter outputs to check supply voltages, regulated voltages, etc.
• Audio amplifi er and loudspeaker.
• Relay drivers for optional antenna relays.
There are several different models of System Regulators as shown in Figure 3-19. The basic SM-3 is
the same size as a transmitter or receiver module. The System Regulator can also be purchased with
1 or 2 optional antenna relays.
Figure 3-19: System Regulators
2
1
5
4
3
6 7
8
11
10
9
FUNCTION
12
SYSTEM REGULATOR
MADE IN CANADA
VOL METER
+
-
ON
OFF
SPKR
INT
EXT
EXT
SPKR
ANTENNA A ANTENNA B
RX A RX B
TX A TX B
2
1
5
4
3
6 7
8
11
10
9
FUNCTION
12
OFF
VOL
SYSTEM REGULATOR
METER
+
-
MADE IN CANADA
ON
OFF
SPKR
INT
EXT
EXT
SPKR
POWER
ON
VOL
SYSTEM REGULATOR
METER
+
-
MADE IN CANADA
ON
OFF
SPKR
INT
EXT
EXT
SPKR
OFF
POWER
ON
2
1
5
4
3
6 7
8
11
10
9
FUNCTION
12
2
1
5
4
3
6 7
8
11
10
9
FUNCTION
12
SYSTEM REGULATOR
MADE IN CANADA
VOL METER
+
-
ON
OFF
SPKR
INT
EXT
EXT
SPKR
ANTENNA A
RX A
TX A