TN910 Rev 5-0-0 May 14
TN910 Codan MT-3 and IFR COM-120 Test Procedures
MT-3 Radio Systems
TECHNICAL NOTES
Page 5 of 16
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Receiver Testing
Connect the IFR COM-120 and Codan radio as shown in Figure 2:
Figure 2: Receiver Testing
Select the GEN MODE button and set up the IFR COM-120 as shown in Figure 3:
Figure 3: IFR COM-120 Receiver Test Confi guration
The AF LEVEL and SCOPE may not read as shown; these levels are set with an external 600 ohm matching load.
Audio levels will read higher without the matching load. See the Receiver and Auxiliary Output Audio Level section
for more information. Enter the correct RF frequency, and ensure that the deviation level is set at ± 60% maximum
deviation (±3.0 KHz wide / ±1.5 KHz narrow).
On the Codan Radio system, ensure the receiver is turned on and turn the System Regulator Speaker switch ON.
Ensure the rotary select switch is set to the correct Receiver Audio (depending on the receiver being tested), then
turn the volume up until the 1 KHz tone is audible.
Rx Balanced Audio Output
(from pins B26 and Z26)
T/R port from IFR COM-120
to RF IN on Rx
AUDIO / DATA
SINAD IN
Note: The Audio Control Card should
be removed for all but the Auxiliary
Audio and CTCSS decode tests.
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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