MIL-DTL-13253E
3.4.9 Receiver. The receiver shall conform to the specified drawing (see 3.1).
3.4.10 Transmitter. The transmitter, transmitter cap, and receiver cap shall conform to the specified
drawing (see 3.1).
3.4.11 Plugs. The plugs shall be as specified (see 3.1).
3.4.12 Handle. The handle shall conform to the specified drawing (see 3.1).
3.4.13 Screws. Screws shall be as specified (see 3.1).
3.4.14 Wire. The wire shall conform to the specified drawing (see 3.1).
3.4.15 Terminal. The terminal shall conform to the specified drawing (see 3.1).
3.5 Dielectric withstanding voltage. When tested as specified in 4.7.2, there shall be no evidence of
degradation in performance of the handsets. There shall be no arcing or breakdown of the insulation.
3.6 Impedance (earphone). When tested as specified in 4.7.3, the impedance of the magnetic
earphone shall be as specified (see 3.1).
3.7 Resistance (microphone)(see 4.7.4). When tested, the resistance shall be 28 ± 1.4 ohms.
3.8 Operational (talk). When handsets are tested as specified in 4.7.5, there shall be no buzzing,
rattling, or other spurious sounds. There shall be transmission of an intelligible signal.
3.9 Vibration. When handsets are tested as specified in 4.7.6, there shall be no evidence of cracking,
loosening of parts, or physical or electrical defects to the handset. Following the test, the earphones shall
meet the frequency response requirements as specified in MIL-M-13189.
3.10 Moisture resistance. When handsets are tested as specified in 4.7.7, the handset shall operate in
any relative humidity up to 98 percent without evidence of warpage or other damage. Corrosion, if
present, shall not be sufficient to interfere with proper operation. Following the test, the earphones shall
meet the frequency response requirements as specified in MIL-M-13189.
3.11 Random drop. When handsets are tested as specified in 4.7.8, there shall be no evidence of
breaking, cracking, or other physical or electrical damage to the handset. Following the test, the
earphones shall meet the frequency response requirements as specified in MIL-M-13189.
3.12 Temperature cycling. When handsets are tested as specified in 4.7.9, there shall be no evidence
of warping or mechanical damage. Following the test, the earphones shall meet the requirements of
frequency response as specified in MIL-M-13189.
3.13 Switches (when applicable). When handsets are tested as specified in 4.7.10, there shall be no
evidence of physical damage, electrical defects or degradation in performance.
3.14 Marking. Handsets shall be marked in accordance with MIL-STD-130, with the type number and
the manufacturer's name or symbol, and as specified (see 3.1).
3.15 Workmanship. Handsets shall be processed in such a manner as to be uniform in quality and
shall be free from loose or deposited foreign materials, and other defects that will affect life, serviceability,
or appearance.
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