MAINTENANCE
PERFORMANCE
TESTS
g.
Verify that the
Modulation
Analyzer reading is less than 44-Hz rms
(or
40-Hz average) at the UUT frequencies listed in step e.
h»
Verify
that the Modulation Analyzer reading is less than 22-Hz rms (or
20-Hz average) at the
UUT frequencies listed in step
d.
i. Verify that the
Modulation Analyzer reading is less than 44-Hz rms (or
40-Hz average) at the UUT frequencies listed in step c.
4A-13.
SWR TESTS
These tests
use a VSWR bridge and a Spectrum Analyzer to verify SWR of the UUT.
REQUIREMENTS
The output VSWR
is less than
1.5:1 for output levels < +ldBm; < 2.0 elsewhere.
TEST
EQUIPMENT
REQUIRED
SWR bridge
(Wiltron
62N50 or equivalent) High-Frequency Spectrum Analyzer
HFSSG
(Fluke 6060B or equivalent)
REMARKS
The UUT settings in this procedure
are chosen to
provide confidence
in
the
SWR
performance of the UUT throughout its range. However, performance also may
be
checked
at other levels
<-10
dBm.
PROCEDURE
a. Connect the HFSSG to the VSWR Bridge RF IN.
b. Connect the Spectrum Analyzer
to
the VSWR Bridge RF OUT.
c. Connect the UUT to the VSWR Device Under Test.
d.
Program
UUT to 1 MHz, +ldBm.
e. Program the HFSSG to 10 MHz, 13 dBm.
f. Set the
Spectrum Analyzer controls to display
approximately
10
to 520 MHz.
Set Reference Level to
+10
dBm.
g.
Step HFSSG from 10 MHz to 1050 MHz in 5 MHz-steps and note frequency
and level where the level
is
a maximum.
h. Program
HFSSG to the frequency found in step
g.
i.
Disconnect UUT from VSWR bridge.
j.
Note Spectrum Analyzer
level.
k. The difference between the levels in steps i and
g
should be greater than 18
dB.
l. Repeat step e through k with UUT set to IMHz, +13dBm.
m. The difference between levels in step i and
g
should be greater than 9.5dB.
4A-17/4A-18
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