IFR COM-120B Service Manual

1-8.7
RF GENERATE
FM DEVIATION CALIBRATION
PREREOUISITES:
1-8-1 POWER
SUPPLY
CALIBRATION
EOUIPMENT
REOUIRED:
1 MODULATION
ANALYZER
FIGURES:
NONE
STEP
PROCEDURE
1. Apply Power to COM-1208.
Allow 5
minute warm-up
period.
2. Connect
T/R
Connector
(12)
to
Modulation Analyzer Input.
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.A
dBm.
6. Set
All Modulation Sources to OFF.
7.
Set
Modulation
Analyzer to
10'l MHz RF.
Set
Modulation
Analyzer
tor
3
kHz
Low-Pass
Filter,
Peak+
and
FM
Measurement.
Record Residual
on
Modulation
Analyzer.
8. Set GENl
Modulation Type
tor FM.
9. Set
Deviation
for 10,0 kHz.
10.
Set
Formattor
TONE. With
Cursor on
Format,
press
CONT
Soft
Function
Key F2.
11.
Set
Tone
Freq for 10.0 Hz.
12.
Set
Shape to SllVE.
13. Verify
Modulation Analyzer reads
10 kHz Deviation
(r600
Hz
+
residual
IStep
7]). lf
not,
go
to
step
45.
14. Engage
300
Hz High-Pass
Filter
on
Modulation Analyzer.
15.
Set
GENl
Modulation Type
to OFF.
Record Residual
on
Modulation
Analyzer.
16. Set GENl
Modulation Type
to
FM.
17.
Set
Tone Freq
to
1000.0 Hz.
18.
Verify Modulation Analyzer
reads 10 kHz Deviation
(1600
Hz
+
residual
[Step
15]). lf not,
go
to Step
45.
19. Set
Modulation
Analyzer Low-Pass Filter
to 20
kHz.
20.
Set
GENl
Modulation Type
to OFF. Record
Residual
on Modulation
Analyzer.
21. Set GENl
Modulation
Type
to FrLt.
1-18
1-8-7
RF GENERATE FM DEVIATION CALIBRATION
PREREQUISITES:
1-8-1 POWER SUPPLY CALIBRATION
EQUIPMENT REQUIRED:
MODULATION ANALYZER
FIGURES:
NONE
STEP
PROCEDURE
1. Apply Power to COM-120B. Allow 5 minute warm-up period.
2. Connect T/R Connector (12) to Modulation Analyzer Input.
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 -20.0 dBm.
6. Set All Modulation Sources to OFF.
7. Set Modulation Analyzer to 101 MHz RF. Set Modulation Analyzer for 3 kHz Low-Pass
Filter, Peak+ and FM Measurement. Record Residual on Modulation Analyzer.
8. Set GEN1 Modulation Type for FM.
9.
Set Deviation for 10.0 kHz.
10. Set Format for TONE. With Cursor on Format, press CONT Soft Function Key F2.
11. Set Tone Freq for 10.0 Hz.
12. Set Shape to SINE.
13. Verify Modulation Analyzer reads 10kHz Deviation (±600 Hz + residual [Step 7]). If not,
go to Step 45.
14. Engage 300 Hz High-Pass Filter on Modulation Analyzer.
15. Set GEN1 Modulation Type to OFF. Record Residual on Modulation Analyzer.
16. Set GEN1 Modulation Type to FM.
17. Set Tone Freq to 1000.0 Hz.
18. Verify Modulation Analyzer reads 10kHz Deviation (±600 Hz + residual [Step 15]). If not,
go to Step 45.
19. Set Modulation Analyzer Low-Pass Filter to 20 kHz.
20. Set GEN1 Modulation Type to OFF. Record Residual on Modulation Analyzer.
21. Set GEN1 Modulation Type to FM.
1-18
Scans by ArtekMedia © 2008

IFR COM-120B Specifications

General

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