TM 11-5985-335-15
Figure 5-3. VSWR test setup diagram.
b.
Test Procedure.
(1) Insure that there are no obstructions within 500 feet of the AS-1425/GRC. If necessary, tilt the antenna
above the horizon to clear obstructions.
(2) Make the test connections shown in figure 54, connecting the output flange of the IM-100/100-37( ) to the
input end of the CG-3307/GRC and the waveguide flange of the UG-1054/u to the input flange of the IM-100/USM47( ).
(3) Turn on the AN/URM-52( ) and the AN/USM-37( ), and allow the warm-up periods specified in the test
equipment manuals.
(4) Adjust the AN/URM42( ) controls for 4.4 GHz at 1 milliwatt (mw) output. Set controls at 1000 Hz square
wave modulation.
(5) The VSWR should not exceed 1.2 to 1 as measured on the AN/USM-37( ).
(6) Set the AN/URM-52( ) output frequency at 4.7 GHz, maintaining the 1-mw output level.
(7) The VSWR should not exceed 1.2 to 1.
(8) Set the AN/URM-52( ) output frequency at 5.0 GHz, maintaining the 1-mw output level.
(9) The VSWR should not exceed 1.2 to 1.
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