1-8-2 TCXO/OCXO
CALIBRATION
PREREQUISITES: 1-8-1 POWER
SUPPLY CALIBRATION
EOUIPMENT REQUIRED: 1 FREQUENCY COUNTER
FIGURES: 1-3
STE
P PROCEDURE
1. Apply Power
to COM-1208.
Allow
5
minute warm-up
period.
2.
Connect
Frequency
Gounter to
AUX RF
OUT Connector
(13).
3.
Press
GEN
Test Mode Key
(3)
to access
RF
Generate Operation Screen.
4.
Set
RF Field
to
998.0000 HHz.
5. Set Output to
AUX
and Output
Level
to
-13
dBm-
6. Set all
Modulation
Sources to OFF.
7. lf
OCXO
is installed,
go
to Step
10.
8.
Verify Frequency
Counter
reads
998.0000
(1199.6
Hz). Adjust
87A16A1R1 as
required
(Figure
1-3).
9. Set COM-1208
Power
to OFF and disconnect test equipment.
10. lf OCXO
is installed,
verify Frequency
Counter
reads
998.0000
(110
Hz). lf not,
go
to Step
12.
11.
Set COM-1208
Power
to OFF and disconnect test equipment.
12. Remove
Protected
Screw
from
OCXO to access
adjustment.
Adjust
OCXO until
Frequency
Counter
reads
998.0000
(t10
Hz).
13. Replace Protected
Screw, set COM-1208
Power
to OFF and
disconnect test equipment.
1-7
1-8-2
TCXO/OCXO
CALIBRATION
PREREQU
IS
ITES:
1-8-1
POWER
SUPPLY
CALIBRATION
EQUIPMENT
REQUIRED:
FREQUENCY
COUNTER
FIGURES:
1-3
STEP
PROCEDURE
1.
Apply
Power
to
COM-120B.
Allow
5
minute
warm-up
period.
2.
Connect
Frequency
Counter
to
AUX
RF
OUT
Connector
(13).
3.
Press
GEN
Test
Mode
Key
(3)
to
access
RF
Generate
Operation
Screen.
4.
Set
RF
Field
to
998.0000
MHz.
5.
Set
Output
to
AUX
and
Output
Level
to
-13
dBm.
6.
Set
all
Modulation
Sources
to
OFF.
7.
If
OCXO
is
installed,
go
to
Step
10.
8.
Verify
Frequency
Cou
nter
reads
998.0000
(±199.6
Hz).
Adjust
87
A
16A
1
R1
as
required
(Figure
1-3).
9.
Set
COM-120B
Power
to
OFF
and
disconnect
test
equipment.
10.
If
OCXO
is
installed,
verify
Frequency
Counter
reads
998.0000
(±10
Hz).
If
not,
go
to
Step
12.
11.
Set
COM-120B
Power
to
OFF
and
disconnect
test
equipment.
12.
Remove
Protected
Screw
from
OCXO
to
access
adjustment.
Adjust
OCXO
until
Frequency
Counter
reads
998.0000
(±10
Hz).
13.
Replace
Protected
Screw,
set
COM-120B
Power
to
OFF
and
disconnect
test
equipment.
1-
7
Scans by ArtekMedia © 2008
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