TM 11-6625-2398-15-3
Step
Test equipment
Equipment under
Test
Performance
No.
control setting
test control settings
procedure
standard
PERCENT
standing wave ratio indicator
MODULATION: 50
VERNIER GAIN control and
ATTENUATOR:
RANGE switch.
0 (zero)
b. Adjust the variable ATTEN-
Insertion loss on
UATOR DB control for the stand-
ATTENUATOR DB
ing wave ratio indicator reading
controls of the variable
recorded in step 2 above.
attenuator must indicate.
6.51.5 and be slightly
less (approximately
0.2dB) than the loss
measured at 1030MHz
between the RF IN/OUT
and RF SUM connectors
Note. Correct the
hybrid attenuator
calibration tag marking
for 1030MHz, if incorrect.
4
Alfred Electronics
ATTENUATOR: As
a. Record the reading on the meter
Model E101
directed in test
of the standing wave ratio indicator
Successively increase
procedure.
for the variable attenuator ATTEN-
the ATTENUATOR
UATOR DB increased control set-
DB control (from the
tings of 6dB, 9dB and 12dB.
reading obtained in
b of step 3) by 6, 9
b. Disconnect the variable attenua-
and 12.
tor as shown by solid lines, figure 8-4.
c. Adjust the hybrid attenuator AT-
Insertion losses must
TENUATOR control for the same
be within the follow-
standing wave ratio indicator meter
ing limits:
readings recorded in a above.
Variable
Hybrid
Attenuator
Attenuator
Control
Control
Settings
Settings
Increased 6dB
13 +2.0, -1.3dB
Increased 9dB
16 +2.5, -1.3dB
Increased 12dB
19 +3.0, -1.5dB
5
SG-340/G
ATTENUATOR:
a. Reconnect the hybrid attenuator,
MEGACYCLES:
0 (zero)
solid lines figure 8-4.
1090
Balance of controls
Insertion loss on the
remain as at end of
MEGACYCLES dial to 1090 with
ATTENUATOR DB
step 2.
the frequency control knob and re-
control of the variable
peat steps 2 and 3.
attenuator must indicate
6.5 1.5 and be slightly
less (approximately
0.2dB) than the loss
measured at 1090MHz
between the RF IN/OUT
and RF SUM connectors
8-15
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