MIL-DTL-83739D
3.4.2 Dissimilar metals. Unless suitably protected against electrolytic corrosion, dissimilar metals shall not be used
in intimate contact with each other. Dissimilar metals are defined in MIL-STD-889.
3.4.3 Fungus inert. Materials used in the construction of switches shall be fungus inert (see 6.4 and table I).
3.4.4 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin
content of antenna switch components and solder shall not exceed 97 percent by mass. Tin shall be alloyed with a
minimum of 3 percent lead, by mass (see 6.6).
3.5 Design and construction.
3.5.1 Dimensions, mounting, and weight. Envelope dimensions, mounting, mounting dimensions, connector
arrangement, and weight shall be as specified (see 3.1).
3.5.2 Micro-electronic circuits. Micro-electronic circuits shall be in accordance with MIL-PRF-38535, class B
minimum. The design shall incorporate a minimum number of components.
3.5.3 Semiconductors. Semiconductors shall be in accordance with MIL-PRF-19500, TX or TXV level.
3.5.4 Printed circuit boards. Printed circuit boards shall be in accordance with MIL-PRF-31032.
3.5.5 Connectors.
3.5.5.1 Radio frequency (RF) connectors. Connectors for a specific switch shall be as required (see 3.1).
Material, design, and construction of the types listed below shall conform to the specifications as follows:
Type of RF
Specification
connector
N
MIL-PRF-39012
TNC
MIL-PRF-39012
BNC
MIL-PRF-39012
SMA
MIL-PRF-39012
SMC
MIL-PRF-39012
SC
MIL-PRF-39012
C
MIL-PRF-39012
HN
MIL-DTL-3643
3.5.5.2 Power connectors. Connectors for a specific switch shall be as required (see 3.1). Materials, design, and
construction shall conform to MIL-DTL-83723.
3.5.6 Configuration. Switches shall be furnished with the number of positions specified (see 3.1).
3.5.7 Sequence. Unless otherwise specified (see 3.1), switches shall have a break-before-make or make-before-
break sequence of operation.
3.5.8 Nominal impedance. Nominal impedance shall be as specified (see 3.1).
3.5.9 Maintainability. Unless otherwise specified (see 3.1), switches furnished under this specification shall be the
non-repairable types. Mounting provisions shall insure that a minimal amount of time and effort is required for
removal and replacement, using standard tools only.
3.5.10 Housings. Switch housings shall be as identified below and as specified (see 3.1).
a.
Enclosed (to exclude humidity): Type E.
b.
Hermetically sealed: Type H.
c.
Immersion-proof: Type I.
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