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That approach will eliminate most cord-cutting concerns—but what about their wireless equivalent, jamming? With the right device tuned to the right frequency, what's to stop a thief from jamming your setup and blocking that alert signal from ever reaching the base station?Jamming concerns are nothing new, and they're not unique to security systems.
出自-2016年12月閱讀原文
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Security devices are required to list the frequencies they broadcast on—that means that a potential thief can find what they need to know with minimal Googling.
出自-2016年12月閱讀原文
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It's easier to find and acquire jamming equipment for some frequencies than it is for others.
出自-2016年12月閱讀原文
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Burglars can easily get a security device's frequency by Internet search.
出自-2016年12月閱讀原文
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Any device that's built to receive a wireless signal at a specific frequency can be overwhelmed by a stronger signal coming in on the same frequency.
出自-2016年12月閱讀原文
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Increasingly, researchers have begun to look at the quality of relationships, rather than at the frequency of contact, between the elderly and their children.
2016年6月四級真題（第一套）閱讀 Section A
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with the right device tuned to the right frequency, what's to stop a thief from jamming your setup and blocking that alert signal from ever reaching the base station?
2016年12月四級真題（第一套）閱讀 Section B
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If we can help to direct students to more of these types of campuses and help students to understand them to be realistic and accessible places, have them apply to these schools at greater frequency and ultimately get in and enroll, we are going to raise the success rate, Rubinoff said, citing a variety of colleges ranging from large state institutions to smaller private schools.
出自-2015年12月閱讀原文
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For this he and his wife received the Nobel Prize for physics in 1910, and did so again in 1912 for their work on very high frequency radio waves.
出自-2013年12月聽力原文
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Their work on very high frequency radio waves
出自-2013年12月聽力原文
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"If we can help to direct students to more of these types of campuses and help students to understand them to be realistic and accessible places, have them apply to these schools at greater frequency and ultimately get in and enroll, we are going to raise
2015年12月六級真題（第三套）閱讀 Section B
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If we can help to direct students to more of these types of campuses and help students to understand them to be realistic and accessible places, have them apply to these schools at greater frequency and ultimately get in and enroll, we are going to raise
2015年12月六級真題（第三套）閱讀 Section B