Why are simplex channels designated in the VHF/UHF band plans?
The correct answer is A: So stations within range of each other can communicate without tying up a repeater. Simplex channels are designated in VHF/UHF band plans so that stations that are close enough to communicate directly can do so without using a repeater. This frees up the repeater for stations that actually need it.
Simplex operation is more efficient for local communications - it doesn't require repeater resources, and both stations can communicate directly. This is especially important during busy times when the repeater might be needed for longer-range communications or emergency traffic. Using simplex for local contacts is considered good operating practice and demonstrates consideration for other operators.
Exam Tip
Simplex channels = Local direct communication. Remember: Simplex channels allow stations within range to communicate directly without using a repeater, which is more efficient and frees up the repeater for those who need it.
Memory Aid
"**S**implex = **S**ave **R**epeater (think 'S = SR' = Save Repeater, use simplex for local contacts)"
Real-World Application
You make a contact with a station only 5 miles away on a repeater. After the initial contact, you both move to a simplex frequency (like 146.55 MHz) to continue your conversation. This frees up the repeater for other operators who might need it for longer-range communications, and your direct simplex contact works perfectly since you're close together.
FCC Part 97.303Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. Simplex channels aren't specifically for contest operation. They're for any local direct communication.
Option C: Incorrect. Simplex isn't only for working DX (long-distance). It's actually better for local communications where stations are close together.
Option D: Incorrect. Simplex channels aren't for accessing repeaters. They're for direct station-to-station communication without repeaters.
题目解析
The correct answer is A: So stations within range of each other can communicate without tying up a repeater. Simplex channels are designated in VHF/UHF band plans so that stations that are close enough to communicate directly can do so without using a repeater. This frees up the repeater for stations that actually need it. Simplex operation is more efficient for local communications - it doesn't require repeater resources, and both stations can communicate directly. This is especially important during busy times when the repeater might be needed for longer-range communications or emergency traffic. Using simplex for local contacts is considered good operating practice and demonstrates consideration for other operators.
考试技巧
Simplex channels = Local direct communication. Remember: Simplex channels allow stations within range to communicate directly without using a repeater, which is more efficient and frees up the repeater for those who need it.
记忆口诀
**S**implex = **S**ave **R**epeater (think 'S = SR' = Save Repeater, use simplex for local contacts)
实际应用示例
You make a contact with a station only 5 miles away on a repeater. After the initial contact, you both move to a simplex frequency (like 146.55 MHz) to continue your conversation. This frees up the repeater for other operators who might need it for longer-range communications, and your direct simplex contact works perfectly since you're close together.
错误选项分析
Option B: Incorrect. Simplex channels aren't specifically for contest operation. They're for any local direct communication. Option C: Incorrect. Simplex isn't only for working DX (long-distance). It's actually better for local communications where stations are close together. Option D: Incorrect. Simplex channels aren't for accessing repeaters. They're for direct station-to-station communication without repeaters.
知识点
Simplex channels, Band plans, Repeater efficiency, Local communications
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.