PORTABLE AND PACK RADIO EQUIPMENT

to primary power circuits, dc circuits, control wiring, and ground conductors serving cryptographic equipment and subscriber terminal equipment that are designated RED. The RED designation also applies to junction boxes, distribution frames, terminal boxes, conduit, ducts, cable racks and hangers, patching and switching panels, cabinets, power distribution panels (both ac and dc), and other ancillary equipment serving the conductors and equipment mentioned above. Primary Red Any conductor intended to carry classified plain language terminating in RED equipment or the RED side of crypto equipment is designated PRIMARY RED. Secondary Red Any conductor, other than PRIMARY RED, that connects to RED equipment, the RED side of crypto equipment, or the RED side of isolation devices, and does not intentionally carry classified information, but because of the coupling mechanism with the RED equipment might carry compromising information, is designated SECONDARY RED. Some examples you are probably familiar with are indicator lines, and control and timing lines. Power distribution panels and grounding systems serving RED conductors are also designated SECONDARY RED. BLACK CRITERIA The BLACK designation applies to all conductors and equipment involved in handling or processing unclassified plain language and encrypted information in electrical form. It also applies to all facilities and circuits that are not designated RED. PORTABLE AND PACK RADIO EQUIPMENT Because portable and pack radio sets must be lightweight, compact, and self-contained, they are usually battery- or generator-powered, have low output power, and are either transceivers or transmitter-receivers. Navy ships and Special Forces carry a variety of these radio sets for amphibious and emergency communications, with the equipment type varying according to the needs of the ship or command. The following paragraphs introduce some of these equipment. AN/CRT-3A Radio transmitter AN/CRT-3A, popularly known as the “Gibson girl,” is a rugged emergency transmitter carried aboard ships and aircraft for use in lifeboats and liferafts. Shown in figure 2-21, it operates on the Figure 2-21.—Emergency Transmitter AN/CRT-3A. 2-24