MIL-DTL-25708F
4.4.2.1.1 Sampling plan. Sample units shall be selected every 6 months. Upon passing this inspection, the
supplier may select sample units every 12 months. If the second level of sampling is passed two successive times,
the supplier may select sample units every 24 months. In the event of a failure, sampling shall revert to the 6-month
interval.
TABLE IV. Group B inspection.
Inspection
Requirement
Test method
paragraph
paragraph
Radiation pattern - - - - - - - - - - - - - - - - - - - - - - - - - - -
Polarization - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
High temperature - - - - - - - - - - - - - - - - - - - - - - - - - - -
Temperature altitude - - - - - - - - - - - - - - - - - - - - - - - -
Temperature shock - - - - - - - - - - - - - - - - - - - - - - - - -
Shock - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Vibration - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Humidity - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Salt fog - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Seal test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Static load - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Resistance to solvents - - - - - - - - - - - - - - - - - - - - - - -
4.4.2.1.2 Noncompliance. If a sample fails to pass group B inspection, the manufacturer shall notify the design
activity (see 6.4) of such failure and take corrective action on the materials or processes, or both, as warranted, and
on all units of product which can be corrected and which were manufactured under essentially the same conditions
with essentially the same materials and processes, and which are considered subject to the same failure.
Acceptance and shipment of the product shall be discontinued until corrective action, acceptable to the preparing
activity, has been taken. After corrective action has been taken, group B inspection shall be repeated on additional
sample units (all inspections, or the inspection which the original sample failed, at the option of the preparing activity
(see 6.4)). Group A inspection may be reinstated; however, final acceptance and shipment shall be withheld until the
group B re-inspection has shown that the corrective action was successful. In the event of failure after re-
inspection, information concerning the failure and the corrective action taken shall be furnished to the cognizant
design activity (see 6.4).
4.5 Methods of examination and test.
4.5.1 Visual and mechanical. Antennas shall be examined to verify that the materials, design, construction,
physical dimensions, marking, and workmanship are in accordance with applicable requirements (see 3.1, 3.3, 3.4,
3.7, 3.8, 3.9, 3.10, and 3.11).
4.5.2 Antenna impedance (see 3.6.3). Impedance measurements shall be made with antenna installed flush in the
center of a 4-foot diameter circular ground plane using an approved slotted-line method, such as Hewlett-Packard
Model 805A or equal, with a bolometer pickup. The impedance of the antenna shall be measured over the frequency
range (see 3.1) at intervals no greater than 25 MHz. (Sweep frequency techniques may be used.) The cable length
between the antenna and the measuring device shall not be greater than 6 feet. VSWR measurements of the
antenna shall be made after environmental tests as well as temperature extremes.
4.5.3 Sampling probe impedance (see 3.6.4). The impedance of the sampling probe shall be measured in
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