Codan Radio MT-4R - Manual (Page 23)

UG-001 Daniels MT-4R and MT-4D Radio Systems
www.danelec.com
Chapter 3: P25 Radio System Confi gurations 15
User
Guide
REPEATER OPERATION WITH EXTERNAL ANALOG
WIRELINE CONTROL
The MT-4R and MT-4D Repeater 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 Monitor 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 a P25 repeater system confi gured for wireline control.
Figure 3-3: P25 Repeater System with Wireline Control shown with Repeater modules
The Vega DSP-223 tone-remote adapter provides the means of remotely controlling Daniels Electronics
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 all
digital information through the repeater (such as NAC, TGID, encryption and data packets).
This alternate confi guration of using analog audio as the repeat path will work with the MT-4R, MT-4D
Base modules and the MT-4D Repeater modules.
VOL
AUDIO A
B
2
1
5
4
3
6 7
8
11
10
9
SYSTEM MONITOR
FUNCTION
METER
+ -
PTT
12
MADE IN CANADA
DANIELS
ELECTRONICS LTD.
FREQUENCY (MHz)
xxx.xxxx
MADE IN CANADA
P25 RECEIVER
NORM
SQ . DI SA B L E
OFF
CNTL
BUS
A
B
A D
RF N I
MADE IN CANADA Model # Code
MADE IN CANADA
DANIELS
ELECTRONICS LTD.
P25 TRANSMITTER
MADE IN CANADA Model # Code
xxx.xxxx
CNTL
BUS
A
B
MIC RF OUT
A D
ANALOG
DIGITAL
OFF
KEY TX
NORM
MIC MODE
FREQUENCY (MHz)
MADE IN CANADA
DANIELS
ELECTRONICS LTD.
P25 BASE
CONTROL
BNK
CI-BC-4E 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
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
-