MIL-DTL-24044C
TABLE V. Group C inspection.
Examination or test
Requirement paragraph
Method paragraph
VSWR of insulator bullet assembly
Alternate method
3.5
High potential
4.6 Method of examination and test.
4.6.1 Visual and mechanical examination. Flanges shall be examined to verify that the interface, construction,
physical dimensions, workmanship and marking are in accordance with the applicable requirements (see 3.1, 3.3,
4.6.2 Voltage standing wave ratio (VSWR). The test set-up for measuring VSWR of the flanges and insulator
bullet assembly shall be as shown in figure 1 or the alternate method shown in figure 2. The VSWR indicators shall
be accurate to within 2 percent. The slotted lines should be as nearly alike electrically as possible with a corrected
VSWR on the order of 1.005:1. With the flanges and bullet assembly in place at "A", and the test frequency set, the
VSWR of the load shall be adjusted to 1.005:1 or less as read with slotted line #2. A measurement shall be now
made with slotted line #1. The VSWR now measured is the VSWR of the bullet and the flanges, and shall not exceed
the amount specified (see 3.5). If the flanges acquired are to be used at frequencies other than those in the range
specified, the test frequencies to be used shall be specified (see 6.2).
Line
Test frequencies (MHz)
Size
7/8
100
750
1500
2250
3000
1-5/8
50
600
1200
1800
2500
3-1/8
50
300
600
900
1200
6-1/8
10
150
300
450
600
4.6.2.1 Alternate method. The test set-up shown in figure 2 may be used as an alternate method for VSWR.
measurement. Two short lengths of the applicable size transmission line shall be used for "L" and provisions shall be
made to keep the inner conductor centered while maintaining low reflections. Flanges shall be attached to the lines
using Electronic Industries Alliance (EIA) mating dimensions. A filler ring, made of the same metal as the flanges,
shall be used in the insulator slot. The thickness and outside diameter of the ring shall be made to fill the slot to
within .002 inch. The inside diameter of the ring shall be the same diameter and tolerance as the inside diameter of
the outer conductor. A straight through bullet with no undercut or insulator shall be used to connect the inner
conductors at point "A" in the initial set-up. Bullet dimensions "A" and "B" shall be the same as that specified in the
specification sheet for the applicable bullet. Dimension "C" shall allow the two center conductors to butt up against
the bullet shoulders but not distort the straightness of the center conductors. Dimensions "D" and the tolerance shall
be the same as the outside diameter of the inner conductor with which it mates. With the straight through bullet and
filler ring in place and the proper test frequency set, the VSWR of the load shall be adjusted to 1.005:1 or less. The
straight through bullet and filler ring shall be removed and the insulator bullet assembly to be tested inserted. The
VSWR now measured is the VSWR of the bullet and should not exceed the amount specified (see 3.5). Test
frequencies shall be the same as in 4.6.2.
4.6.3 Insertion force. Inner connectors shall be tested using a spring scale and a nominal diameter length of inner
conductor to verify that the insertion force of the inner connector into the inner conductor is as specified (see 3.6).
4.6.4 Surface roughness. Surface roughness shall be determined in accordance with ASME-B46.1 (see 3.4).
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