MIL-DTL-28837C
b.
Corrosion-resisting steel plates, sheets, and stays shall conform to ASTM-A240/A240M, ASTM-A-666, and
ASTM-A693 and SAE-AMS5511. Corrosion-resisting forging shall conform to SAE-AMS-QQ-S-763, and
corrosion-resisting steel pipe shall conform to MIL-P-24691/3. Corrosion resisting steel bar shall conform
to ASTM-A582/A582M and ASTM A484/A484M.
c.
Copper alloy sheet shall conform to ASTM-B36/B36M and ASTM-B121/B121M.
d.
Aluminum alloy shall conform to alloy A360 of ASTM-B85/B85M, ASTM-B26/B26M, ASTM-B108/B108M,
SAE-J452, SAE-AMS4290, and SAE-AMS4291, alloy 356-T6 of ASTM-B108/B108M or alloy D712.0-F of
ASTM-B26/B26M.
e.
Brass shall conform to alloy 360 of ASTM-B121/B121M, ASTM-B36/B36M, ASTM-B16/B16M, and ASTM-
B124/B124M.
f.
Beryllium copper shall conform to ASTM-B194 or ASTM B196/B196M.
g.
Pure tin shall be prohibited internally and externally.
3.3.1 Dissimilar metal. Unless suitably protected against electrolytic corrosion, dissimilar metal as defined in MIL-
STD-889 shall not be in intimate contact.
3.3.2 Plastic. Plastic shall conform to ASTM-D5948, ASTM D4894, ASTM D4895 and ASTM D1710.
3.3.3 Fungus. Material used in the construction of mixers shall be fungus inert.
3.3.4 Headers. Headers shall conform to MIL-H-28719.
3.4 Design and construction. Mixers shall be of design, construction, and physical dimensions specified (see 3.1).
3.4.1 Frequency response range. The frequency response range shall be as specified (see 3.1).
3.4.2 Nominal impedance. Unless otherwise specified (see 3.1), the nominal impedance looking into the local
oscillator and RF ports of Transverse-Electro-Magnetic (TEM) mixers shall be 50 ohms.
3.4.3 Input level. The input level for mixers shall be as specified (see 3.1).
3.4.4 Threaded parts. All screw threads used in construction of mixers shall be in accordance with FED-STD-H28.
3.4.5 Mounting. Mixers shall be mounted in any position.
3.4.6 RF connections.
3.4.6.1 Coaxial connectors. Coaxial connectors for a specific mixer shall conform to MIL-PRF-39012 as applicable
(see 3.1).
3.4.6.2 Waveguide flanges. Unless otherwise specified (see 3.1), all flanges used on mixers shall mate electrically
and mechanically with flanges covered by MIL-DTL-3922 or (see 6.6).
3.4.6.3 Printed circuit connectors. Printed circuit connections for a specific mixer shall conform to MIL-DTL-55302
as applicable (see 3.1).
3.4.6.4 Leads. Lead connections for a specific mixer shall be a chemical composition conforming to MIL-STD-
1276 or SAE-AMS-I-23011 and unless otherwise specified (see 3.1), shall be solderable.
3.4.6.5 Socket pins. Unless otherwise specified (see 3.1), socket pins for a specific mixer shall be in accordance
with header specification MIL-H-28719.
3.4.6.6 Receptacles. Receptacle connections for a specific mixer shall be as specified (see 3.1).
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