Which term describes transmission and reception on the same frequency?

• A. Skin friction drag
• B. Simplex
• C. Simplified directional facility
• D. Slant range

Answer: (B)

Transmission and reception on the same frequency is called simplex communication. In aviation radios, simplex means one frequency serves as the shared channel for both talking and listening, with users typically taking turns transmitting. You don’t have two separate frequencies for TX and RX in this mode, so you switch between transmitting and listening rather than doing both at once.

The other terms aren’t about sharing a single channel: skin friction drag relates to air resistance on the aircraft, slant range is a line-of-sight distance measure, and a Simplified Directional Facility is a navigation aid, not a description of how a radio channel is shared. So simplex is the term that precisely describes transmission and reception on the same frequency.