Which of the following can be used to enter a transceiver’s operating frequency?
The keypad or VFO knob✓Bonne réponse
The CTCSS or DTMF encoder
The Automatic Frequency Control
All these choices are correct
Explication
On a modern transceiver the frequency is set either by turning the VFO tuning knob or by typing it directly on the keypad. CTCSS and DTMF encoders send tones, and automatic frequency control only makes small corrections, so neither is a way to enter a frequency.