TM 11-6625-2398-15-3
Step
Test equipment
Equipment under
Test
Performance
No.
control setting
test control settings
procedure
standard
1030
variable attenuator
Balance of controls
must indicate 0 +3.0,
as at end of step 2.
-0.0dB.
b. ATTENUATOR:
b.
Repeat step 4.
Successively to 3, 6,
hybrid attenuator
9, 12, 15, 20 and 25.
must be within the
following limits:
Hybrid
Variable
Attenuator
Attenuator
Control
Control
Settings
Settings
3dB
3+3.0, -2.0dB
6dB
6+3.0, -2.0dB
9dB
9+3.0, -2.0dB
12dB 12 +3.0, -2.0dB
15dB 15 +3.0, -2.0dB
20dB 20 +3.0, -2.0dB
25dB 25 +3.0, -2.0dB
Note. Correct the hybrid
attenuator calibration tag
marking for 1030MHz, if
incorrect.
(7) Adapter CP7/CP8(2).
8-9. Hybrid Attenuator VSWR Measurements
(8) Cables W14/W15(2).
a. Test Equipment and Materials.
(9) Cable A1W3.
(1) Signal Generator SG-340/G.
(10) Adapter UG-606/U.
(2) Coaxial Slotted Line IM-92/U.
b. Test Connections and Conditions. The five hybrid
(3) Standing Wave Ratio Indicator AN/UPM-
attenuator test configurations in figure 8-6 are connected
108A.
to the test equipment in accordance with the directions
(4) Low Pass Filter HP-360C.
supplied in the procedure below.
(5) Fixed Attenuator AT1/AT2(1).
(6) Terminations AT3/AT4(2).
Step
Test equipment
Equipment under
Test
Performance
No.
control setting
test control settings
procedure
standard
1
a. SG-340/G
None
a. Set the MEGACYCLES dial to
POWER ON
10.30 with the frequency control
Function Switch:
knob. Turn on the signal generator
1000
and allow a minimum of 20 minutes
MEGACYCLES:
warm-up period before proceeding.
1030
Adjust the MOD LEVEL control for
MOD UP NORMAL
a reading of 50 on the PERCENT
DOWN:
MODULATION meter.
NORMAL
Attenuator 0dB
(outer scale)
PERCENT MODU-
LATION: 50
b. AN-UPM-108A
b. Turn on the standing wave ratio
POWER: ON
indicator and allow a minimum of
RANGE: 0 (zero)
10 minutes warm-up period before
METER SCALE:
proceeding.
NORMAL
INPUT SELECTOR:
XTAL-200 K Ω
8-19
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