Chapter 3: mt-4e radio system configurations, Repeater operation – Codan Radio MT-4E Analog and P25 Digital - User Guide User Manual
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MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | USER GUIDE
Chapter 3: MT-4E Radio System Confi gurations Page 13
CHAPTER 3: MT-4E RADIO SYSTEM CONFIGURATIONS
REPEATER OPERATION
The MT-4E modules may be confi gured to operate as a repeater, a repeater with a link, a cross-band
system or two independent repeaters using the CI-RC-4L repeater control card. The repeater system
can be set for analog only, P25 digital only, or mixed mode operation. In mixed mode, the receiver
determines the incoming signal (analog or digital) and transmits the same signal.
The receiver and transmitter modules connect to the CI-RC-4L repeater controller through RJ45 cables
as shown in Figure 3-1.
Figure 3-1: MT-4E Repeater System shown with two pairs of transceivers
The repeater controller 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
link, cross-band system, etc.) by setting jumpers. Receiver priority and simplex operation can also be
jumpered for certain confi gurations.
The RJ45 cables carry the signals from the receiver, through the controller to the transmitter(s). The
signals on the RJ45 cables are analog COR/PTT, digital COR/PTT and LVDS serial data. The LVDS
serial data is the digitized analog or P25 digital information that is passed through the repeater.
TRANSMITTER
CNTL
BUS
MIC
RF OUT
A D
ANALOG
DIGITAL
NORM
OFF
KEY TX
MIC MODE
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
RECEIVER
NORM
SQ. DISABLE
OFF
CNTL
BUS
A D
RF N
I
REF
IN
USB
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
REPEATER
CONTROL
RX B
TX B
RX A
TX A
PULL DOWN
TO REMOVE
9
5
3
7
11
15
9
13
3
7
11
15
SWITCH A
SWITCH B
TRANSMITTER
CNTL
BUS
MIC
RF OUT
A D
ANALOG
DIGITAL
NORM
OFF
KEY TX
MIC MODE
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
RECEIVER
NORM
SQ. DISABLE
OFF
CNTL
BUS
A D
RF N
I
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE