Is FSB simplex or duplex?

Is FSB simplex or duplex?

• A. Simplex
• B. Duplex
• C. Neither
• D. Both

Answer: (A)

In radio terms, simplex uses one frequency for both sending and receiving, and you must switch between talking and listening rather than transmitting and receiving at the same time. Duplex uses two frequencies (or a repeater link) so talk and listen happen on separate channels, or even simultaneously. A Fire Support Base typically coordinates fire support on a single radio channel—units and observers communicate on the same frequency with designated call signs, without relying on a repeater or dual-channel setup. That setup aligns with simplex operation. If longer reach were needed, a different link or repeater could be used elsewhere, but the standard base configuration is simplex.

In radio terms, simplex uses one frequency for both sending and receiving, and you must switch between talking and listening rather than transmitting and receiving at the same time. Duplex uses two frequencies (or a repeater link) so talk and listen happen on separate channels, or even simultaneously.

A Fire Support Base typically coordinates fire support on a single radio channel—units and observers communicate on the same frequency with designated call signs, without relying on a repeater or dual-channel setup. That setup aligns with simplex operation. If longer reach were needed, a different link or repeater could be used elsewhere, but the standard base configuration is simplex.