IFR COM-120B Service Manual

-8-13
FM DEVIATION
METER
PREREOUIS ITES:
EOU IPMENT REQUIRED:
FIGURES:
STEP
CALIBRATION
1-8-1 POWER
SUPPLY CALIBRATION
1-8-2 TCXO/OCXO
CALIBRATION
1
1
1-9
MODULATION ANALYZER
SIGNAL GENERATOR
00603m3
Figure 1-9 Modulation Meters
Calibration Setup
PROCEDURE
SIGNAL
GENERATOR
coM-1208
MODULATION
ANALYZER
I
t.
2.
3.
Apply
Power
to COM-1208.
Allow
5
minute warm-up
period.
Press REC Test
Mode Key
(3)
to access
RF Receive
Operation Screen.
Set
Receive
Operation
Screen
Parameters
as follows:
RF Field
I nput
Attenuation
Demodulation
Type
lF Bandwidth
101.4000 MHz
ANT
30
dB
FM
300
kHz
4. Move
cursor to
5.
Press
CONFIG
6. Set
Modu lation
7 .
Set
Modu
lation
Li
ne.
Soft
Function Key F6
to access
Receiver
Audio/Data
Filters
Setup
Menu.
Meters Filter Line
High-Pass
Filter tor
300 Hz.
Meters Filter
Line Low-Pass
Filter
for 4 kHz.
1-38
1-8-13 FM DEVIATION METER CALIBRATION
PREREQUISITES:
EQU IPMENT REQUIRED:
FIGURES:
1-8-1 POWER SUPPLY CALIBRATION
1-8-2 TCXO/OCXO CALIBRATION
1-9
MODULATION ANALYZER
SIGNAL GENERATOR
SIGNAL
COM-120B
MODULATION
GENERATOR ANALYZER
(7)
OUTPUT
ANTENNA
INPUT
Figure 1-9 Modulation Meters Calibration Setup
STEP PROCEDURE
1. Apply Power to COM-120B. Allow 5 minute warm-up period.
2. Press REC Test Mode Key (3) to access RF Receive Operation Screen.
3. Set Receive Operation Screen Parameters as follows:
RF Field
Input
Attenuation
Demodulation Type
IF Bandwidth
4. Move cu rsor to Li ne.
101.0000 MHz
ANT
30 dB
FM
300 kHz
00603003
5. Press CONFIG Soft Function Key F6 to access Receiver Audio/Data Filters Setup Menu.
6. Set Modulation Meters Filter Line High-Pass Filter for 300 Hz.
7. Set Modulation Meters Filter Line Low-Pass Filter for 4 kHz.
1-38
Scans by ArtekMedia © 2008

IFR COM-120B Specifications

General

Brand	IFR
Model	COM-120B
Category	Measuring Instruments
Language	English