Which of the following is a common use of the dual-VFO feature on a transceiver?
The correct answer is C: To transmit on one frequency and listen on another. A common use of the dual-VFO feature on a transceiver is to transmit on one frequency and listen on another. This is called 'split' operation - you can transmit on one VFO and receive on the other. For amateur radio operators, this is essential for DX operation and working split. Understanding this helps when operating split frequencies.
Exam Tip
Dual-VFO use = transmit on one frequency, listen on another. Think 'D'ual-'V'FO = 'D'ifferent 'V'FOs for transmit and receive. Allows split operation - transmit on one VFO, receive on the other. Not simultaneous transmission, not full duplex, not accuracy - just split operation.
Memory Aid
"Dual-VFO use = transmit on one frequency, listen on another. Think 'D'ual-'V'FO = 'D'ifferent 'V'FOs. Allows split operation - transmit on one VFO, receive on the other. Essential for DX and split operation."
Real-World Application
A DX station is working split - listening on 14.200 MHz, transmitting on 14.195 MHz. You use dual-VFO: VFO-A set to 14.200 MHz (receive), VFO-B set to 14.195 MHz (transmit). This allows you to listen on one frequency and transmit on another - essential for split operation.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Dual-VFO doesn't allow transmitting on two frequencies at once - you can only transmit on one frequency at a time. It's for split operation, not simultaneous transmission.
Option B: Incorrect. Dual-VFO doesn't permit full duplex - amateur radio is half-duplex (transmit or receive, not both simultaneously). Full duplex isn't possible.
Option D: Incorrect. Dual-VFO doesn't improve frequency accuracy - accuracy comes from the oscillator, not from having two VFOs. Accuracy isn't the purpose.
题目解析
The correct answer is C: To transmit on one frequency and listen on another. A common use of the dual-VFO feature on a transceiver is to transmit on one frequency and listen on another. This is called 'split' operation - you can transmit on one VFO and receive on the other. For amateur radio operators, this is essential for DX operation and working split. Understanding this helps when operating split frequencies.
考试技巧
Dual-VFO use = transmit on one frequency, listen on another. Think 'D'ual-'V'FO = 'D'ifferent 'V'FOs for transmit and receive. Allows split operation - transmit on one VFO, receive on the other. Not simultaneous transmission, not full duplex, not accuracy - just split operation.
记忆口诀
Dual-VFO use = transmit on one frequency, listen on another. Think 'D'ual-'V'FO = 'D'ifferent 'V'FOs. Allows split operation - transmit on one VFO, receive on the other. Essential for DX and split operation.
实际应用示例
A DX station is working split - listening on 14.200 MHz, transmitting on 14.195 MHz. You use dual-VFO: VFO-A set to 14.200 MHz (receive), VFO-B set to 14.195 MHz (transmit). This allows you to listen on one frequency and transmit on another - essential for split operation.
错误选项分析
Option A: Incorrect. Dual-VFO doesn't allow transmitting on two frequencies at once - you can only transmit on one frequency at a time. It's for split operation, not simultaneous transmission. Option B: Incorrect. Dual-VFO doesn't permit full duplex - amateur radio is half-duplex (transmit or receive, not both simultaneously). Full duplex isn't possible. Option D: Incorrect. Dual-VFO doesn't improve frequency accuracy - accuracy comes from the oscillator, not from having two VFOs. Accuracy isn't the purpose.
知识点
Dual-VFO, Split operation, Transmit/receive frequencies, VFO features
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.