TM 11-6625-1702-35
(4) Ground plane.
410. Antenna Element Test
(5) Test radome.
a. Test Equipment and Materials.
b . Test Connections and Conditions. C o n -
(1) Power supply, 28 volt dc.
nect the test equipment as shown in figure 45.
(2)
Radio
Set
AN/ARC-131,
or
equiva-
Use the test leads supplied. Insert the antenna
lent.
c o u p l e r into the test radome and mount on
the ground plane.
(3) Antenna Coupler, 437S-1/1A.
c. Procedures.
Control
settings
Performance standard
Test
procedures
Equipment under test
Test
equipment
Step No
None.
Adjust power supply to
Turn on power supply
Set RF SELECT switch
1
obtain a 27.5 volt
and fm transmitter.
to OUTPUT. Set ME-
dc indication on test
Allow time for warm-
TER FUNCTION
set meter.
switch to 28 VDC.
up.
Set MANUAL TUNE
switch to OFF.
If antenna coupler is
Apply RF power to
Set MANUAL TUNE
2
None
type 437S1, an-
the test panel and
switch alternately to
tenna coupler re-
observe cyclic action
INCREASE FRE-
mains inactive. If
of the antenna
QUENCY and DE-
antenna coupler is
coupler.
CREASE FRE-
type 437S1A,
QUENCY.
antenna coupler
operates.
Performance standard
Performance test
4-11. Test Data Summary
d. Coupler test (para d . Coupler stops cycling
when RF power is
The chart below lists the performance stand-
removed.
ards for each individual performance test. Use
e. RF wattmeter test e. With
this chart to compare the values obtained dur-
frequency set at 30
ing testing with the performance standards Of
MHz or 76 MHz,
the test set.
forward and re-
reflected RF power
Performance test
Performance standard
readings on AN/
a. Dc meter scale test a. Input voltage 27.5
ARM115 agree with
1.3 volts dc.
readings recorded
b. Millivolt source test b . Millivolt output:
on AN/URM120
+250 12 mv;
10%.
250 12 mv.
f. Coupler 437S-1 re-
f. Antenna element
c. TUNE INDICATOR c. Repetition rate for in-
mains inactive.
test.
function test
dicator full bril-
Coupler 437S-1A
liance : 15 5 ms.
operates.
C h a n g e 1 4-9
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