The Radio on the Ridge
Written by Studio AM.
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Two handheld radios can lose contact when a hill stands between them. Many very-high-frequency signals travel mainly along paths that work best with a clear view between antennas. Rock, buildings, and Earth's curve can block or weaken that path.
A radio repeater solves part of the problem. It places a receiver and transmitter at a high site, such as a ridge or tall building. One radio sends on the repeater's input frequency. The receiver picks up the message, and the transmitter sends it out again on an output frequency. A person beyond the hill can then hear it.
Height does not make the signal bend through the rock. Instead, it gives the repeater a clearer path to radios on both sides. The system also depends on power, tuned equipment, and an agreed channel plan. The quiet box on the ridge works as a relay: it lets people coordinate across terrain that would otherwise divide their radios.
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Questions
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Question 1 of 4
What is the main idea of the passage?
The answer is A: A high radio repeater receives and retransmits messages so radios separated by terrain can communicate.
The passage traces a blocked direct path and shows how an elevated receiver-transmitter relays the message across the obstruction.
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Question 2 of 4
Why is a repeater often placed at a high site?
The answer is B: A high site can provide clearer radio paths on both sides of an obstruction.
The third paragraph rejects bending through rock and instead links height to clearer paths toward radios on both sides.
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Question 3 of 4
What does “relay” mean here?
The answer is C: A system that receives a message and passes it onward
The repeater first receives the message and then transmits it again, which is the passing-on action of a relay.
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Question 4 of 4
What happens after the receiver picks up a message?
The answer is D: The transmitter sends the message out on an output frequency.
The middle paragraph states that the transmitter sends the received message out again on an output frequency.
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