TM 11-6625-2398-15-3
Step
Test equipment
Equipment under
Test
Performance
No.
control setting
test control settings
procedure
standard
Note. Correct the
hybrid attenuator cali-
bration tog marking for
1090MHz. if incorrect.
6
Alfred Electronics
ATTENUATOR:
Repeat step 5.
Insertion losses must
Model E101
As directed in test
be within the follow-
Successively increase
procedure.
ing limits:
the ATTENUATOR
Hybrid
Variable
DB control (from the
Attenuator
Attenuator
reading obtained in b of
Control
Control
step 5), by 6, 9 and 12.
Increased 6dB
13 +2.0, -1.3dB
Increased 9dB
16 +2.5, -1.3dB
Increased 12dB
19 +2.5, -1.4dB
(7)
Fixed Attenuators AT1/AT2(2).
8-8. Hybrid Attenuator Calibration Tests
a. Test Equipment and Materials.
(8)
50-ohm Terminations (2), Microlab/FXR TA-
6Mn.
(1)
Signal Generator SG-340/G.
(9)
Cables W14/W15(2).
(2) Variable
Attenuator,
Alfred
Electronics
Model E101.
(10) Cable A1W3.
(3)
Standing Wave Ratio Indicator AN/UPM-
(11) Adapter UG-606/U.
108A.
b. Test Connections and Conditions.
Initially
(4)
Crystal Detector HP-423A.
connect the equipment as shown in solid lines, figure 8-5.
Disconnect the hybrid attenuator and connect the variable
(5)
Adapter UG-201A/U.
attenuator (connections shown in broken lines) as directed
(6)
Adapters CP7/CP8(2).
in the procedure below.
Step
Test equipment
Equipment under
Test
Performance
No.
control setting
test control settings
procedure
standard
1
a. SG-3-40/G
None
a. Set the MEGACYCLES dial to
POWER: (N
1090 with the frequency control
Function Switch:
knob. Turn on the signal generator
CW
and allow a minimum of 20 minutes
MEGACYCLES:
warm-up period before proceeding.
1090
b. AN UPM-108A
b. Turn on the standing wave ratio
POWER: ON
indicator and allow a minimum of
METER SCALE:
10 minutes warm-up period before
NORMAL
proceeding.
INPUT SELECTOR:
XTAL-200 KΩ
c. SG-340/G
POWER: OFF
zero set the OUTPUT VOLTS
(down)
meter.
OUTPUT VOLTS:
zero set
d. SG-340/G
POWER: ON
adjust the OUTPUT LEVEL control
Attenuator: 0dB
knob for an OUTPUT VOLTS
8-16
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