Question
Which of the following is a common use of the dual-VFO feature on a transceiver?
Answer Options
- A) To allow transmitting on two frequencies at once
- B) To permit full duplex operation – that is, transmitting and receiving at the same time
- C) To transmit on one frequency and listen on another
- D) To improve frequency accuracy by allowing variable frequency output (VFO) operation
Correct Answer: C
Explanation
VFO stands for Variable Frequency Oscillator, and in a modern transceiver, the dual-VFO feature means the radio can store and operate on two independent frequencies, VFO A and VFO B. The most common use of this feature is to operate split frequency — that is, to transmit on one frequency (VFO A) and listen on another (VFO B).
This is essential for working DX (long-distance) stations that are calling ‘split,’ where the DX station transmits on their frequency and listens for replies on a separate, dedicated ‘listening’ frequency. Dual-VFO operation makes it quick and easy to manage both frequencies simultaneously, ensuring smooth split-frequency communication.
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