Complex repeater operation – Codan Radio MT-3 User Manual
Page 22
USER GUIDE | MT-3 ANALOG RADIO SYSTEMS
Chapter 3: Analog Radio System Confi gurations
Page 14
COMPLEX REPEATER OPERATION
The MT-3 modules may be confi gured to operate in more complex repeater confi gurations, such as
a cross-band or linked system using the AC-3E control card. The AC-3E allows jumper selectable
connections from RXA to TXA and/or TXB and RXB to TXA and/or TXB (any receiver to any
transmitter).
The receivers, transmitters and AC-3E control card are shown in Figure 3-2.
Figure 3-2: MT-3 Analog Complex Repeater System shown with two pairs of transceivers
The AC-3E 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, dual repeater, repeater with
a link, cross-band repeater, etc.) by setting jumpers.
The AC-3E has auxiliary connections for connecting external equipment.
The AC-3E is jumper selectable to allow for fi ltering of the CTCSS tones in the control card. The voice
band fi lter in the receivers can be enabled for additional CTCSS fi ltering if required, or to remove the
CTCSS tones from the System Regulator speaker.
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-3E has a current draw of less than 30 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
5
9
13
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
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