
MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE
Chapter 5: Codan Radio System Testing Page 45
Transmitter Digital Testing
Connect the IFR 2975 and Codan Radio as shown in Figure 5-31.
Figure 5-31: Transmitter Digital Testing
On the IFR 2975, recall Codan setup 8 (Tx_Dig) from your internal drive. Enter the correct RF frequency
on the IFR 2975, set the MIC MODE switch on the front panel of the transmitter to Digital and fl ip the
other switch to KEY TX (or set the switch to NORM and key the transmitter through the RSS).
TRANSMITTER
CNTL
BUS
MIC RF OUT
AD
ANALOG
DIGITAL
NORM
OFF
KEY TX
MICMODE
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
Tx Balanced Audio Input
(to pins B18 and Z18)
Computer running RSS
USB from
Computer to Tx
Tx RF OUT to T/R port on IFR 2975
HELP
MODE
TAB
SHIFT
+
-
.
BKSP
HOLD
RETURN
ESC
ENTER
POWER
12
ABC
3
DEF
JKL MNOGHI
654
TUV WXYZPQRS
987
#0*
VOLUME
SQUELCH
GEN T/R ANT
125 W MAX
MIC AUDIO I/O
DVMCH2CH1SCOPETEST PORT
100V MAX 100V MAX 100V MAX
AUDIO IN AUDIO OUT 1 AUDIO OUT 2
Audio
Out 1
VOL
SYSTEM REGULATOR
METER
+
-
MADE IN CANADA
ON
OFF
SPKR
INT
EXT
EXT
SPKR
OFF
POWER
ON
2
1
5
4
3
67
8
11
10
9
FUNCTION
12
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