Antenna relay activation, Simplex operation – Codan Radio MT-4E Analog and P25 Digital - User Guide User Manual
Page 50

USER GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS
Chapter 6: Radio System Components
Page 42
Antenna Relay Activation
The motherboard on the subrack contains a set of jumpers that are used to activate the optional antenna
relays in the System Regulator module from the Transmitter PTT IN and PTT OUT signal lines. Figure
6-3 shows the location of these jumpers.
JU36
TXA PTT OUT activates Relay A
JU37
TXA PTT IN activates Relay A
JU39
TXA PTT OUT activates Relay B
JU40
TXA PTT IN activates Relay B
JU42
TXB PTT OUT activates Relay A
JU43
TXB PTT IN activates Relay A
JU45
TXB PTT OUT activates Relay B
JU46
TXB PTT IN activates Relay B
Simplex Operation
The motherboard on the subrack contains a set of jumpers that are enabled when the radio system is
operated in simplex mode (simplex base station or simplex links). The jumper connects the Transmitter
PTT OUT signal line to the RX MUTE. This jumper will cause the receiver to mute when the transmitter
is keyed.
JU38
TXA PTT OUT mutes RXA
JU41
TXA PTT OUT mutes RXB
JU44
TXB PTT OUT mutes RXA
JU47
TXB PTT OUT mutes RXB
Figure 6-3: Subrack / Motherboard Rear View
A SIDE
BANK AND CHANNEL
SELECT JUMPERS
B SIDE
BANK AND CHANNEL
SELECT JUMPERS
POWER INPUT
+10 to +17 Vdc
+13.8 Vdc NOMINAL
15 AMP FAST
BLOW FUSE
(5604-5GAGC150)
+13.8 Vdc LINE
TRANSIENT SUPPRESSOR
(2007-1N637800) &
REVERSE VOLTAGE DIODE
(2001-MR751000)
+9.5 Vdc LINE
TRANSIENT SUPPRESSOR
(2007-1N637500) &
REVERSE VOLTAGE DIODE
(2001-MR751000)
+9.5 Vdc REGULATED
POWER INPUT /
OUTPUT
(NOT TYPICALLY USED)
CHANNEL SELECT
PULL-UP OR EXTERNAL
CONTROL JUMPERS
ANTENNA RELAY
& RX MUTE
ACTIVATION
JUMPERS
TELEX AND
AUXILIARY
CONNECTORS
CHANNEL SELECT
PULL-UP OR
EXTERNAL
CONTROL
JUMPERS
CI-RC-4M-G2
CONNECTOR