Codan MT-4E, Maintenance Manual

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MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS
Chapter 5: Codan Radio System Testing Page 42
Transmitter CTCSS Testing
MT-4E Transmitters can be programmed, per channel, to generate CTCSS tones internally, or to allow
for External Input of the CTCSS tones from another device (such as a tone-remote adapter).
Connect the IFR 2975 and Codan Radio as shown in Figure 5-28. The Tx Subtone input connection
is only required when testing the External Input. If the internal programming is used to generate the
CTCSS tone, disconnect the Tx Subtone input from the IFR 2975.
Figure 5-28: Transmitter CTCSS Testing
On the IFR 2975, recall Codan setup 7 (Tx_CTCSS) 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).
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
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
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
Tx Subtone Input
(to pins B22 and Ground (B32))
AUDIO IN AUDIO OUT 1 AUDIO OUT 2
Audio
Out 1