Simplex. Transmission and reception on the same frequency.
Simplified directional facility (SDF). A NAVAID used for nonprecision instrument approaches.
Simplex
Simplified directional facility (SDF)
Simultaneous Offset Instrument Approach (SOIA) ...
SIMPLEX
Single frequency for both transmitting and receiving in communications; generally implies a push-to-talk function and verbal procedures.
The radio works using the "simplex" system, meaning only one person can talk at a time. The microphone is keyed and the person talks. Upon completing that communication, he/she releases the switch and listens.
  
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