TN910 Rev 5-0-0 May 14
TN910 Codan MT-3 and IFR COM-120 Test Procedures
MT-3 Radio Systems
TECHNICAL NOTES
Page 9 of 16
© 2014 Codan Limited All rights reserved.
43 Erie Street
Victoria, B.C.
Canada V8V 1P8
Toll Free Canada & U.S.A.
Phone: 1-800-664-4066
Fax: 1-877-750-0004
International
Phone: 250-382-8268
Fax: 250-382-6139
Internet
Email: LMRsales@codanradio.com
Web: www.codanradio.com
Receiver Front End Alignment and Tuning:
Tuning of the Front End fi lter is typically only required when the Sensitivity or Distortion does not meet published
specifi cations, or when the receiver RF frequency is changed beyond the band pass of the fi lter (typically 5 - 7
MHz).
Connect the IFR COM-120 and Codan radio as as shown in Figure 8:
Figure 8: Receiver Front End Alignment and Tuning
The internal cable in the receiver from the output of the front end terminates in an SMB connector. The SMB plugs
directly into the Receiver 21.4 MHz IF / Audio Main Board. Disconnect the SMB cable from the Mainboard connector
and use the SMB-BNC adapter to connect this point to the ANT input on the IFR COM-120.
Select the ANLYZ INSTRUMENTS button and set up the IFR COM-120 as shown in Figure 9:
Figure 9: IFR COM-120 Spectrum Analyzer Confi guration
Enter the correct RF frequency and ensure the receiver is turned on. The fi lter waveform will appear on the scope
display. To tune the Front End fi lter, remove the dust caps on the variable capacitors and, starting from the capacitor
closest to the front panel and moving back, tune the fi lter to its new frequency.
Front End output from Receiver
to ANTENNA input on IFR COM-120
AUX RF OUT port from IFR COM-120
to RF IN on Rx
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
To Next Page
Loading...
Need help?
General