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Using jammers can block many signals

At present, the mobile phone signal jammers used in the examination room are all full frequency bands, which can interfere with all the frequency bands of the three operators 2G/3G/4G/5G, and WIFI signals and Bluetooth signals can also be shielded. The above is the principle of mobile phone signal jammer. However, the frequency band of electromagnetic waves ranges from a few Hz to several hundreds of GHz, and each segment may be used as a communication signal. Will there be some special frequency bands that are used in the examination room? This is true for other radio communication tools, and radio communication tools with dedicated frequency bands “came into being” in this context.

http://www.jammer-buy.com/cell-phone-jammer/c-24.html


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socialworldgroup
socialworldgr   2021-10-19 15:31:21    0
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The river flows eastward98
vipcontentt1   2021-10-18 16:04:05    0
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It means you are going to be promoted.
topreview   2021-10-15 17:51:38    0
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U.N. record predicts weather disaster, absent essential movement
rockmikee   2021-10-12 16:17:41    0
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worldescortspag
worldescortspag   2021-09-29 17:27:07    0
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The river flows eastward11
gohotcon1   2021-09-28 15:13:22    0
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tantified   2021-09-28 14:20:43    0
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wiuwiu   2021-09-28 14:18:34    0
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Are you used to using jammers?
jammerbuyer   2021-09-24 16:34:51    0
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whotplace
whotplace   2021-09-24 12:17:34    0