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In military operations and grid-down survival environments—whether from EMP, cyber attack, geomagnetic storm, or infrastructure collapse—reliable, low-tech communication is essential. The TA-312/PT field telephone and SB-22/PT switchboard form a classic, battle-proven wired system that operates independently of the grid, satellites, or cellular networks. These U.S. military surplus items provide secure, jam-resistant voice comms over wire lines, making them ideal for homestead security, community networks, patrols, or defensive perimeters. The TA-312/PT Field Telephone The TA-312/PT (and its variant TA-312A/PT) is a rugged, two-wire, battery-operated field telephone introduced in the 1950s–1960s as a replacement for the TA-43/PT. It's designed for harsh field use: splashproof, durable cast-alloy (or plastic in later models) body, and portable with a canvas carrying case and shoulder strap. Key Features and Specifications Operation Modes: Local Battery (LB): Uses 2 × BA-30 ("D-cell") 1.5V batteries for voice power; hand-crank magneto (G-42/PT) generates 90–100V at 20 Hz for ringing. Common Battery (CB): Draws power from a central source (e.g., switchboard); supports CB signaling. LB with CB Signaling (CBS): Hybrid mode. Range: Up to 14 miles (wet) or 22 miles (dry) on WD-1/TT field wire; longer on better cable (e.g., 50 miles on spiral-four CX-1065/G). Audio: 300–3,200 Hz frequency range;...Be our Patron to see this content. If you find a page you cannot access please let me know.
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