What term describes an amateur station that is transmitting and receiving on the same frequency?

• A. Simplex
• B. Duplex
• C. Bridge
• D. Relay

Answer: (A)

The term that describes an amateur station transmitting and receiving on the same frequency is "Simplex." In simplex communication, one station sends a message while the other station receives it, both using the same frequency. This method is commonly used in many forms of radio communication, including amateur radio, where operators may converse directly without needing complex equipment or additional frequencies for simultaneous transmission and reception.

In contrast, duplex communication involves separate frequencies for transmitting and receiving, allowing for a simultaneous two-way conversation without interruptions. Terms like "bridge" and "relay" refer to systems or devices that help relay messages or connect different networks, but they do not specifically describe the method of communication regarding shared frequencies. Thus, the term "simplex" distinctly characterizes the operation of using the same frequency for both sending and receiving signals.