Chapter 3: analog radio system configurations, Simple repeater operation – Codan Radio MT-3 User Manual
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MT-3 ANALOG RADIO SYSTEMS | USER GUIDE
Chapter 3: Analog Radio System Confi gurations Page 13
CHAPTER 3: ANALOG RADIO SYSTEM CONFIGURATIONS
SIMPLE REPEATER OPERATION
The MT-3 modules may be confi gured to operate as a repeater or two independent repeaters using
the AC-3L-96 control card. The AC-3L-96 control card was discontinued in 2006. The AC-3E control
card is now used for all simple and complex repeater confi gurations. The AC-3L-96 allows a direct
connection from RXA to TXA and RXB to TXB. No cross-banding, linking or external connections are
capable with the AC-3L-96.
The receivers, transmitters and AC-3L-96 control card are shown in Figure 3-1.
Figure 3-1: MT-3 Analog Simple Repeater System shown with two pairs of transceivers
The AC-3L-96 control card is hardware jumpered to control the interconnection between the modules.
This allows the user to select the operation of this system (single repeater or dual repeater) by setting
jumpers.
The AC-3L-96 has no auxiliary connections for connecting external equipment.
The AC-3L-96 does not allow for fi ltering of the CTCSS tones in the control card. The voice band fi lter
in the receivers must be enabled if CTCSS is used in the system. The motherboard carries the signals
from the receiver, through the controller to the transmitter(s). The signals on the motherboard are COR,
PTT, Balanced Audio, Receiver Discriminator Audio, Receiver Mute and Transmitter Subtone 1 Input.
The AC-3L-96 has a current draw of less than 1 mA. The optional CTCSS decoders / encoders have a
current draw of less than 13 mA each.
5
7
5
7
AUDIO
CONTROL
RX A
RX B
TX A
TX B
TX A
TX B
9
13
5
5
9
13
PULL DOWN
TO REMOVE
T X
REFERENCE
INPUT
OFF
KEY TX
MIC
RF OUT
NORM
TRANSMITTER
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
SQ . DI SA B L E
N
O
RM
O
F F
RF N
I
REFERENCE
INPUT
RECEIVER
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
T X
REFERENCE
INPUT
OFF
KEY TX
MIC
RF OUT
NORM
TRANSMITTER
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
SQ . DI SA B L E
N
O
RM
O
F F
RF N
I
REFERENCE
INPUT
RECEIVER
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
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