IFR COM-120B Service Manual

.8.10
RF
GENERATE
EXTERNAL MODULATION
CALIBRATION
PREREQUISITES:
1-8-1
POWER
SUPPLY CALIBRATION
EQUIPMENT REQUIRED:
FIG
URES:
1-8.7 RF
GENERATE
FM
DEVIATION
CALIBRATION
1.8.8 RF
GENERATE PM DEV!ATION
CALIBRATION
1-8-9 RF
GENERATE
AM MODULATION
CALIBRATION
1
AUDIO ANALYZER
1
MODULATION
ANALYZER
1-5
AUDIO ANALYZER
coM-1208
(18) (12)
MODUI-ATlON
ANALYZER
HlGH IMPEDANCE
OUTPUT
00603002
Figure 1-5 External
Modulation
Calibration
Setup
STEP PROCEDURE
1. Apply Power
to
COM-12O8.
Allow
5
minute warm-up
period.
2.
Connect Test Equipment
as shown
in Figure
1-5.
3.
Press
GEN
Test Mode
Key
(3)
to access
RF
Generate Operation Screen.
4.
Set
RF Field
to
101.0000 MHz.
5.
Set Output to
T/R
and Output Level
to
-20
dBm.
6. Set
All
Modulation
Sources to OFF.
7.
Set
Modulation
Analyzer for 3 kHz Low-Pass
Filter,
300
Hz High-Pass Filter,
Peak+
and
AM
Measu rement.
Set
EXT Modulation Type tor
AM.
Set
Audio
Analyzer for 1 kHz
tone at approximately
5.657
Vrms
output.
Adjust
Audio
Analyzer
for Modulation Analyzer
reading
of 80%.
8.
9.
1-25
1-8-10 RF GENERATE EXTERNAL MODULATION CALIBRATION
PREREQUISITES:
1-8-1 POWER SUPPLY CALIBRATION
1-8-7 RF GENERATE FM DEVIATION CALIBRATION
1-8-8 RF GENERATE PM DEVIATION CALIBRATION
1-8-9 RF GENERATE AM MODULATION CALIBRATION
EQUIPMENT REQUIRED:
FIGURES:
AUDIO ANALYZER
HIGH IMPEDANCE
OUTPUT
1-5
AUDIO ANALYZER
MODULATION ANALYZER
COM-120B
(18) (12)
EXT MOD
T/R
MODULATION
ANALYZER
INPUT
00603002
Figure 1-5 External Modulation Calibration Setup
STEP PROCEDURE
1. Apply Power to COM-120B. Allow 5 minute warm-up period.
2. Connect Test Equipment as shown in Figure 1-5.
3. Press GEN Test Mode Key (3) to access RF Generate Operation Screen.
4. Set RF Field to 101.0000 MHz.
5. Set Output to TIR and Output Level to -20 dBm.
6. Set All Modulation Sources to OFF.
7. Set Modulation Analyzer for 3 kHz Low-Pass Filter, 300 Hz High-Pass Filter, Peak+ and AM
Measurement.
8. Set EXT Modu lation Type for AM.
9. Set Audio Analyzer for 1 kHz tone at approximately 5.657 Vrms output. Adjust Audio
Analyzer for Modulation Analyzer reading of 80%.
1-25
Scans by ArtekMedia © 2008

IFR COM-120B Specifications

General

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