TM 11-6625-2398-15-3
Step
Test equipment
Equipment under
Test
Performance
No.
control setting
test control settings
procedure
standard
OUTPUT VOLTS:
meter indication at the SET LEVEL
SET LEVEL
(+4DBM) mark.
Note. Check that OUTPUT VOLTS meter
indication is exactly on the SET LEVEL mark
with the attenuator set to OdB (outer scale).
Readjust the OUTPUT LEVEL control knob if
required.
2
SG-340/G
ATTENUATOR:
Adjust the MOD. LEVEL control for
Function Switch:
0 (zero)
a reading of 50 on the PERCENT
1000
MODULATION meter. Adjust the
MOD. UP-NORMAL-
standing wave indicator VERNIER
DOWN:
GAIN control and RANGE switch
NORMAL
for an exact meter reading (e.g.,
PERCENT
.5 on the DB meter scale). Record
MODULATION: 50
the meter reading.
AN/UPM-108A
RANGE:
As required for
meter reading.
3
Controls remain as at end of step 2.
a. Disconnect the hybrid attenuator
under test and connect the variable
attenuator, as shown by broken
lines, figure 8-5.
b. Adjust the variable attenuator
ATTENUATOR IBH
ATTENUATOR DB control for the
control of the variable
same standing wave ratio indicator
attenuator must
meter reading recorded in step 2
indicate 0 +1.0.
above.
-0.0dB.
4
Alfred Electronics
ATTENUATOR:
a. Disconnect the variable attenuator
Model E101
Successively to 3,
and reconnect the hybrid attenuator, as
As directed in the
6, 9, 12, 15, 20
shown by solid lines, figure 8-5.
test procedure.
and 25.
b. Record the readings on the meter
of the standing wave ratio indicator
for the hybrid attenuator ATTENUATOR
control settings of 3, 6, 9, 12, 15, 20 and 25.
c. Disconnect the hybrid attenuator
and reconnect the variable attenuator,
as shown by broken lines, figure 8-5.
d. Adjust the variable attenuator,
Calibration of the
ATTENUATOR DB control for the
hybrid attenuator
same standing wave ratio indicator
must be within the
meter readings recorded in b above.
following limits:
Hybrid
Variable
Attenuator
Attenuator
Control
Control
Settings
Settings
3dB
3 + 1.0
6dB
6 + 1.0
9dB
9 + 1.0
12dB
12 + 1.0
15dB
15 + 1.1
20dB
20 + 1.1
2.5dB
25 + 1.2
Note. Correct the
hybrid attenuator cali-
bration tag marking for
1090MHz, if incorrect.
5
SG-340/G
a.
ATTENUATOR:
a.
Repeat steps 2 and 3.
a. ATTENUATOR
MEGACYCLES:
0 (zero)
dB control of the
6-18
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