MIL-STD-1310H(NAVY)
5.4.5 Terminal protection device. TPDs shall be installed on all HF, VHF, and UHF antennas serving mission critical systems. The TPDs shall be procured that meet the test methods specified in NCS TIB 85-10 or the classified EMP environment referenced in MIL-STD-464 and defined in MIL-STD-2169.
5.4.6 EMP protection, composite structure. When EMP requirements are called out for composite ships or structures, a PPD to address the general EMP requirements shall be developed. If it cannot be shown by analysis or test that the composite structure meets EMP requirements, the interior of the structure shall be treated as being in a topside environment for electromagnetic considerations.
5.5 Superstructure blockage and reflections. Superstructure EM blockage and reflections shall be controlled for minimal affect on system operations. The following design and production practices shall be implemented to minimize blockage and reflections.
5.5.1 Topside configuration drawings. Superstructure, antennas, and topside-mounted equipment shall be located in accordance with the specified Topside Antenna Arrangement and Configuration drawings.
5.5.2 Flat and reflective surfaces. Flat surfaces and corner reflectors subject to illumination by main-beam transmit signals from directional antennas shall be avoided in developing ICDs and fabricating topside
structure.
a. Round stock and pipe. To diffuse and scatter reflections, round stock and pipe shall be used as a general rule in the design and fabrication of mast stanchions, supports and equipment foundations that will be illuminated by the main beam of a directional transmit antenna.
b. Tilted/angled installation. Antenna mounting base(s) or foundation(s) shall be fabricated to offset, angle or tilt the antenna as necessary to minimize coupling between nearby antennas; to isolate antennas from nearby metallic structure; and to enhance antenna radiation and reception patterns.
c. Radar-absorbent material (RAM). RAM shall be installed where necessary to control harmful EM
reflections.
5.6 Equipment-generated EMI prevention. Narrowband filters, preselectors, multicouplers, etc., as required to protect wideband receiver front end stage(s) shall be installed or inserted between the associated antenna(s) and shipboard LF, MF, HF, VHF, and UHF communications, intelligence, weather facsimile, navigation, and ships entertainment receiving equipment. These devices and other EMI mitigated electronic equipment that require high attenuation/isolation to RF levels shall be grounded by Class B or C grounding method that provides the required MIL-STD-464 RF grounding resistance of 2.5 milliohms DC from the electronic unit to the ships ground plane.
5.6.1 RF tuned receiver front-end stages. No additional protection shall be required for LF, MF, HF, VHF, or UHF receivers with an RF-tuned front-end stage.
5.6.2 LF-MF receiver(s), but no in-band transmitter(s). No additional protection shall be required for LF
and MF receivers if:
a. The ship has no onboard LF and MF transmit capability, and
b. The selectivity of the LF/MF receiver's front-end stages prevents entry of out-of-band HF and higher frequency signals.
5.6.3 BBN suppression; portable electrical tools. Arc suppression filters shall be provided across the commutator/brushes of all electric motors.
5.7 Electrical safety; personnel shock hazard prevention. All shipboard equipment operating from an external electrical power source of 30 volts or more, including COTS or NDI, shall provide personnel shock hazard protection in accordance with the following and Appendix B.
5.7.1 Portable and mobile-transportable electrically-powered equipment. Shock hazard protection for portable and mobile-transportable electrically-powered equipment to be used aboard ship shall be provided through:
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