What technique allows commercial analog TV receivers to be used for fast-scan TV operations on the 70-centimeter band?
The correct answer is A: Transmitting on channels shared with cable TV. What technique allows commercial analog TV receivers to be used for fast-scan TV operations on the 70-centimeter band is transmitting on channels shared with cable TV. 70cm band overlaps with cable TV channels, so standard TV receivers can be used. For amateur radio operators, this is important for fast-scan TV operation. Understanding this helps when operating fast-scan TV.
Exam Tip
Use commercial TV receivers for 70cm fast-scan TV = transmit on channels shared with cable TV. Think 'C'ommercial 'T'V 'R'eceiver = 'C'able 'T'V 'R'ange. 70cm band overlaps with cable TV channels, so standard TV receivers can be used. Not satellite dishes, not channel 2, not USB/sound card - just cable TV channels.
Memory Aid
"Use commercial TV receivers for 70cm fast-scan TV = transmit on channels shared with cable TV. Think 'C'ommercial 'T'V = 'C'able 'T'V channels. 70cm band overlaps with cable TV channels, so standard TV receivers can be used. Important for fast-scan TV operation."
Real-World Application
Fast-scan TV on 70 centimeters: The 70cm band overlaps with cable TV channels (e.g., channels 57-61). By transmitting on these frequencies, you can use standard commercial analog TV receivers to receive the signal. The TV receiver tunes to the cable TV channel frequency. This is the technique - transmit on channels shared with cable TV.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. Using converted satellite TV dishes isn't the technique - transmitting on cable TV channels allows standard receivers. Satellite dishes isn't the technique.
Option C: Incorrect. Transmitting on abandoned TV channel 2 isn't the technique - transmitting on cable TV channels allows standard receivers. Channel 2 isn't the technique.
Option D: Incorrect. Using USB and demodulating with computer sound card isn't the technique - transmitting on cable TV channels allows standard receivers. USB/sound card isn't the technique.
题目解析
The correct answer is A: Transmitting on channels shared with cable TV. What technique allows commercial analog TV receivers to be used for fast-scan TV operations on the 70-centimeter band is transmitting on channels shared with cable TV. 70cm band overlaps with cable TV channels, so standard TV receivers can be used. For amateur radio operators, this is important for fast-scan TV operation. Understanding this helps when operating fast-scan TV.
考试技巧
Use commercial TV receivers for 70cm fast-scan TV = transmit on channels shared with cable TV. Think 'C'ommercial 'T'V 'R'eceiver = 'C'able 'T'V 'R'ange. 70cm band overlaps with cable TV channels, so standard TV receivers can be used. Not satellite dishes, not channel 2, not USB/sound card - just cable TV channels.
记忆口诀
Use commercial TV receivers for 70cm fast-scan TV = transmit on channels shared with cable TV. Think 'C'ommercial 'T'V = 'C'able 'T'V channels. 70cm band overlaps with cable TV channels, so standard TV receivers can be used. Important for fast-scan TV operation.
实际应用示例
Fast-scan TV on 70 centimeters: The 70cm band overlaps with cable TV channels (e.g., channels 57-61). By transmitting on these frequencies, you can use standard commercial analog TV receivers to receive the signal. The TV receiver tunes to the cable TV channel frequency. This is the technique - transmit on channels shared with cable TV.
错误选项分析
Option B: Incorrect. Using converted satellite TV dishes isn't the technique - transmitting on cable TV channels allows standard receivers. Satellite dishes isn't the technique. Option C: Incorrect. Transmitting on abandoned TV channel 2 isn't the technique - transmitting on cable TV channels allows standard receivers. Channel 2 isn't the technique. Option D: Incorrect. Using USB and demodulating with computer sound card isn't the technique - transmitting on cable TV channels allows standard receivers. USB/sound card isn't the technique.
知识点
Commercial analog TV receivers, Fast-scan TV, 70-centimeter band, Cable TV channels
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.