Question T4B02
From subelement T4 - T4B
Which of the following can be used to enter a transceiver’s operating frequency?
Why is this correct?
The keypad and VFO knob are the two primary methods for entering operating frequencies on transceivers. The keypad allows direct frequency entry by typing exact numbers, while the VFO (Variable Frequency Oscillator) knob lets you tune up or down the band incrementally. CTCSS/DTMF encoders generate tone signals for repeater access, not frequency entry. Automatic Frequency Control adjusts for signal drift but doesn't set operating frequency.
Memory tip
Remember the pattern: frequency entry requires either direct input (keypad) or manual tuning (VFO). Controls with 'tone' or 'automatic' in their names typically serve specialized functions like repeater access or signal correction, not basic frequency setting.
Learn more
Modern transceivers offer multiple frequency entry methods to suit different operating situations. Direct keypad entry excels for quickly jumping to known frequencies like repeater channels or net frequencies. VFO tuning works better for band exploration or fine-tuning around a target frequency. Understanding both methods enhances your operational flexibility and helps you efficiently navigate amateur frequency privileges within your license class.
Think about it
Why do you think transceivers provide both keypad and VFO methods for frequency entry rather than just one approach?