A jamming device
Some people make mobile phone calls in the car or in the hall, even though there is a note that they cannot be used. However, I want to be careful and avoid troubles as much as possible. A "jammer" that jams the radio waves of mobile phones can be used in such cases. What kind of device is it?
With the rapid spread of mobile phones, various harmful effects have been pointed out. There are also concerns about breaking the silence and affecting precision equipment. It is a wifi jammer when urging you to stop using it by detecting the radio signal of mobile phones, PHS, and Homer. It helps to improve mobile phone etiquette in various places. If there is a PHS base station near the installation location, you can prevent malfunction due to the signal from the base station by setting.
The angle of the radio jammer antenna can be fine-tuned freely. Corresponding to the frequency, he can turn on / off and adjust the strength for each cutoff band. Acts such as disassembling or modifying to illegally output output are criminal acts that violate the Radio Law. In Japan, the act of blocking radio waves without the permission of the Ministry of Internal Affairs and Communications may violate the Radio Law. It is most effective in cases where it is difficult to improve by just alerting the audience in places where the use of mobile phones is not desirable or where quiet space is required. However, when I was reading a book on the train today, people around me started to flutter my cell phone. I wondered if I had switched on the WiFi jammer without knowing it, but it turned off properly. By the way, my cell phone is also out of service. Maybe someone else was jamming.
The frequency band used by overseas satellites is 3400-4200MHz, while the mobile 3.5GHz band is 3480-3600MHz. Or, there is a radio wave leaking from the mobile 3.5GHz band (unnecessary emission 3480 MHz or less, 3600 MHz or more). Since the radio wave in the mobile 3.5GHz band partially overlaps with the radio wave in the signal band of the overseas satellite TV, the TV signal is transmitted from the radio wave of the overseas satellite TV due to the deterioration of the signal power to noise power ratio (C / N) from the satellite. It becomes difficult to take out. It depends on the characteristics of the mobile 3.5GHz charged wave (difference in level between the main wave and unnecessary emission), but in many cases, interference in the main wave 3480-3600MHz band becomes dominant.
Since the end of March, the Korean Ministry of Foreign Affairs has had a problem with a total of 1007 airlines in 14 countries including South Korea on the 23rd due to a problem that the satellite-based positioning system (GPS) reception failure occurred in a commercial aircraft flying over South Korea. The International Civil Aviation Organization (ICAO) has concluded that it was caused by North Korea's jamming radio waves.
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