TN910 Codan MT-3 and IFR COM-120 Test Procedures
MT-3 Radio Systems
TECHNICAL NOTES
TN910 Rev 5-0-0 May 14Page 10 of 16
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Transmitter Testing
Connect the IFR COM-120 and Codan radio as shown in Figure 10:
Figure 10: Transmitter Testing
Select the REC MODE button and set up the IFR COM-120 as shown in Figure 11:
Figure 11: IFR COM-120 Transmitter Test Confi guration
Enter the correct RF frequency, and ensure that the transmitter is set to KEY TX and the Audio Control Card is NOT
plugged into the subrack. Set the receive audio fi lters and AF Generator frequency and level as shown in Figures
12 through 15.
MIN MAXHOLD
REL
%
ms
Hz
RANGE
dB
dB
ac+dc
ac+dc
ac+dc
ac+dc
F
nS
mA
mA
A
mV
V
mV
V
OFF
C
A
A
A
A
mA
COM
V
TEMPERATURE
A
MIN MAXHOLD
REL
%
ms
Hz
RANGE
dB
dB
ac+dc
ac+dc
ac+dc
ac+dc
F
nS
mA
mA
A
mV
V
mV
V
OFF
C
A
A
A
A
mA
COM
V
TEMPERATURE
A
AutoHOLD
LOGGING
SAVECANCEL
FAST MN MX
SETUP
YES
NO
DIGITAL MULTIMETER
CLEAR MEM
VIEW
Tx Balanced Audio Input
(to pins B18 and Z18)
T/R port from IFR COM-120 to RF OUT on Tx
AUDIO/DATA
GEN OUT
Note: The Audio Control Card should
be removed for all but the Auxiliary
Audio and CTCSS encode tests.
*Tx Subtone Input 1
Deviation Level Test
(to pins B22 and Ground (B32))
Optional
External DVM
Connected to
Tx Balanced
Audio Input
STORE RCL
SHOW
LIST
SETUP
MEMORY
INSTRUMENTS
ANLYZSCOPE
MTRS
AUDIO
GEN
MODE
RECGEN
SPCL
DPLX
DATA ENTRY
132
456
789
*
0#
+/-
.
SHIFT
ENTER
C
O
N
T
R
O
L
ESC
HOLD
SCRN
START
STOP
TAB
DATA SCROLL
ANTENNA
10 W MAX
50 W
PHONES
SQUELCH
VOLUME
T / R
RF IN/OUT
AUX
RF OUT
AUDIO/DATA
GEN OUT
DEMOD
OUT
MIC / ACCEXT MOD
IN
AUDIO/DATA
SINAD IN
SCOPE/DVM
IN
POWER
SQ. D ISA BL E
N
O
RMO
FF
RF NI
REFERENCE
INPUT
RECEIVER
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
TX
REFERENCE
INPUT
OFF
KEY TX
MIC
RF OUT
FREQUENCY (MHz)
NORM
TRANSMITTER
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
57
57
AUDIO
CONTROL
RX A
RX B
TX A
TX B
TX A
TX B
5
9
13
5
9
13
PULL DOWN
TO REMOVE
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
This product has been discontinued and is no longer manufactured by Codan Radio Communications
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