Codan MT-4E, Maintenance Manual

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MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE
Chapter 5: Codan Radio System Testing Page 37
TRANSMITTER TESTING
Transmitter Analog Testing
Connect the IFR 2975 and Codan Radio as shown in Figure 5-23.
Figure 5-23: Transmitter Analog Testing
On the IFR 2975, recall Codan setup 6 (Tx_Ana) 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 Analog, and fl ip the
other switch to KEY TX (or set the switch to NORM and key the transmitter through the RSS).
FGEN1 is confi gured to inject a 1.0 KHz tone at -8.0 dBm (0.308 Vrms) into the transmitter balanced
input.
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
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
1 2
ABC
3
DEF
JKL MNO GHI
6 5 4
TUV WXYZ PQRS
9 8 7
# 0 *
VOLUME
SQUELCH
GEN T/R ANT
125 W MAX
MIC AUDIO I/O
DVM CH2 CH1 SCOPE TEST 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
6 7
8
11
10
9
FUNCTION
12