Codan Radio MT-4E Analog and P25 Digital - User Guide - Manual (Page 23)

MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | USER GUIDE
Chapter 3: MT-4E Radio System Confi gurations Page 15
REPEATER OPERATION WITH EXTERNAL ANALOG
WIRELINE CONTROL
The MT-4E modules have a 600 ohm balanced input / output for use with analog audio. The receiver
modules also have a parallel analog audio output that is used to drive the speaker built in to the
System Regulator module. To connect the analog audio from the receiver / transmitter modules to an
external device (such as a tone remote adapter), the analog audio is routed through a CI-BC-4E base
controller.
The RJ45 cables are connected directly from the receiver to the transmitter for the repeat path, and all
external analog audio, COR and PTT routing is through the base controller auxiliary inputs and outputs.
Figure 3-3 shows an MT-4E repeater system confi gured for wireline control.
Figure 3-3: MT-4E Repeater System with Wireline Control
The Telex DSP-223 tone-remote adapter provides the means of remotely controlling Codan base stations
and repeaters. The adapters can be used in conjunction with tone-remote control consoles which use
the industry-standard sequential tone keying format. The DSP-223 adapters are interconnected to the
distant remote control console(s) by any analog voice grade transmission medium such as a microwave
link, a leased telephone line, or a twisted-pair 600-ohm line.
Alternate Confi guration (Using Analog Audio)
Optionally, the user could set the repeat path through the base controller, and disconnect the RJ45
cable repeat path. The repeat path through the controller uses analog audio (not serial data as the
RJ45 cables use). The analog audio repeat path is slower than the RJ45 path, and does not pass
digital information (such as NAC, TGID, encryption and data packets) 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
P25 BASE
CONTROL
BNK
PULL DOWN
TO REMOVE
5
9
13
RX A
A
B
BNK 5
9
13
TX A
A
B
TX A TX B
Secure
Clear
Zeroize
Key
Local
Disable
Enable
TELEX
PROGRAMMING PORT
DSP-223
PTT IC
HANDSET
POWER PTT MONITOR
FUNCTION
CTCSSLINE RX LINE TX
+
RADIO TX
+
RADIO RX LINE TX LINE RX RADIO TXRADIO RXCTCSS RADIO TX
-
GROUND LINE TX
-
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