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MIL-DTL-83538 Connectors And Accessories, Electrical, Circular, Umbilical, Environment Resistant, Removable Crimp Contacts For Mil-Std-1760 Applications \(Metric\), General Specification ForThis specification covers connectors and accessories, electrical, circular, umbilical. The connector assembly provides the necessary connections required to meet MIL-STD-1760, class I electrical interface between stores and their associated launchers using a "blind mating" mechanism. The connector assembly consists of a receptacle installed on the launcher, a receptacle installed on the store, and a buffer plug installed between the two receptacles. This specification also includes the required mounting adapters and nut, accessory adapter, cable bushing, and protective covers \(see 6.1 for details on intended use and application\). The connectors covered by this specification are intended for use with launcher mechanisms with an applied holding force in the range 271 Newtons \(61 lbs\) to 427 Newton \(96 lbs\).

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MIL-DTL-83538D
3.27 Insertion loss. This test is only applicable when the MIL-DTL-83538/3 buffer is part of the set
under test. When tested as specified in 4.6.23, the mated connector shall comply with the applicable
contact resistance requirements of SAE-AS39029 for all contacts except the total allowed resistance
though the combined mated triplet of launcher receptacle with buffer plug, and store receptacle with
buffer plug shall not exceed 1.5 times the limit of SAE-AS39029 for the applicable size contacts. In
addition, the coaxial contacts for the high bandwidth signals shall provide a maximum attenuation of:
High bandwidth 1, referenced to 50 ohms:
20 Hz to 20 MHz measured insertion loss shall not exceed 0.20 dB.
20 MHz to 500 MHz measured insertion loss shall not exceed 0.12 dB.
500 MHz to 2 GHz the measured insertion loss shall not exceed
0.11 dB x  F , where F is the test frequency in GHz.
TABLE III. EMI shielding effectiveness.
Frequency MHz
Leakage attenuation (dB) minimum
0.2 to 100
90
200
88
300
88
400
87
800
85
1,000
85
1,500
69
2,000
65
3,000
61
4,000
58
6,000
55
10,000
50
3.27 Insertion loss. This test is only applicable when the MIL-DTL-83538/3 buffer is part of the set
under test. When tested as specified in 4.6.23, the mated connector shall comply with the applicable
contact resistance requirements of SAE-AS39029 for all contacts except the total allowed resistance
though the combined mated triplet of launcher receptacle with buffer plug, and store receptacle with
buffer plug shall not exceed 1.5 times the limit of SAE-AS39029 for the applicable size contacts. In
addition, the coaxial contacts for the high bandwidth signals shall provide a maximum attenuation of:
High bandwidth 1, referenced to 50 ohms:
20 Hz to 20 MHz measured insertion loss shall not exceed 0.20 dB.
20 MHz to 500 MHz measured insertion loss shall not exceed 0.12 dB.
500 MHz to 2 GHz the measured insertion loss shall not exceed
0.11 dB x  F , where F is the test frequency in GHz.
3.28 Voltage standing wave ratio. This test is only applicable when the MIL-DTL-83538/3 buffer is part
of the set under test. When tested as specified in 4.6.24, the mated connector sets shall provide a
maximum voltage standing wave ratio (VSWR) of 1.75 for the high bandwidth signals over the frequency
range of 20 Hz to 2 GHz for high bandwidth 1 referenced to 50 ohms.
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