MIL-DTL-49295C
4.4.3.2 Procedure in the event of failure during group C inspection. The contractor shall immediately report in
writing each group C failure occurrence, including details of the failure and characteristics affected. The contractor
shall immediately investigate the cause of failure and further report the results of investigation and details of the
proposed corrective action on (1) the process and materials, as applicable, and (2) all units of product which were
manufactured under the same conditions and which the Government considers subject to the same failure. Reports
shall be forwarded to the responsible technical activity designated in the contract through the quality assurance
representative for evaluation. After corrective action has been taken, additional sample units shall be subjected to
group C inspection (all inspections, or the inspections which the sample failed, at the option of the Government) and
groups A and B inspection may be reinstituted; however, final acceptance and shipment will be withheld until group C
re-inspection results have shown that the corrective action was effective.
4.4.3 3 Re-inspection of conforming group C sample units. Unless otherwise specified, sample units which have
been subjected to and passed group C inspection may be accepted on the contract or order provided all damage is
repaired and the sample units are resubjected to and pass groups A and B inspection.
4.5 Electrical performance.
4.5.1 Antenna array. The contractor shall perform the following tests on the antenna system to demonstrate
performance in accordance with the specification requirements.
4.5.1.1 Free space VSWR. The test shall be in accordance with TIA-329 except that the measurement shall be
performed with a vector impedance meter or other instrument of equivalent accuracy (see 3.4.2.4).
4.5.1.2 RF power capability. The antenna system shall be installed using a metal mast. To electrically include the
mast insulator in the test, a ground connection shall be completed between the support mast section and the ground
side of the input matching transformer ground connector. Three hundred and fifty (350) watts of power shall be
applied to the assembly at the input matching transformer connector. The power source shall be a continuous wave,
radio frequency source having a nominal output impedance of 50 ohms. The test frequency shall be at a high end of
the specified frequency range. Power shall be applied for a period of 30 minutes. During the period when power is
applied, the insulation material shall be observed for evidence of RF flashover or leakage. After power is removed
the insulation material shall be inspected for evidence of RF flashover or leakage. Evidence of RF flashover or
leakage shall constitute a failure. The test shall be completed within 1 hour of the time of completion of exposure to
4.5.1.3 Matching transformer power. For convenience of test instrumentation, two matching transformers are
employed in the test with the balanced sides joined together by the shortest possible connections. Both matching
transformers are subjected to the service conditions and the results are adjusted to account for the doubling to
effects of the test. Power from a radio frequency source having a 50 ohm output impedance shall be fed to the coax
connector of one matching transformer through an in-line RF wattmeter capable of measuring forward and reverse
power. The coax connector of the second balun shall be connected to an RF wattmeter having a 50 ohm load
impedance. The signal source shall be adjusted to supply 200 watts forward power at the in-line wattmeter. VSWR
shall be measured at the in-line wattmeter and coupling efficiency shall be observed by measuring power at the load
4.5.1.4 Dielectric withstanding voltage. The antenna system shall be subjected to the test in accordance with
4.5.1.5 Antenna gain test. The relative power gain of the antenna compared to a half-wave dipole, adjusted to
resonance, shall be measured. The gain of the array and dipole shall be recorded and compared at 30, 35, 40, 45,
50, 55, 60, 65, 70, 75, 80, 85, and 88 MHz. The gain shall meet the requirements of 3.4.2.5 with the test conducted
in vertical polarization. The requirements of 3.4.2.6 and 3.4.2.8 shall also be satisfied (see 3.4.2.5, table III).
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