There are equipment to prevent eavesdropping
More precisely, this is a technique called “scrambling”, namely jammers and jammers. With the popularity of mobile phones, this interference has become popular among the public.
Interference is a device that interferes with radio waves used in communication devices such as mobile phones. When this kind of interference occurs, it interferes with radio waves emitted by mobile phones at a certain distance from the device.
Places that are susceptible to interference include concert halls, movie theaters and hospitals where the use of mobile phones is restricted.
Recently, signal jammer has been installed around bank ATM machines, which are often used to prevent transfer fraud. Many people may be familiar with this news.
Moreover, this interference is an effective preventive measure to prevent the use of radio waves for eavesdropping.
Interference can also prevent eavesdropping
You can use scrambling to block listening. Several scramblers are commercially available and can be purchased by the public.
Jammers can be divided into two types.
Types of blocking/blocking radio waves
Types of hard to hear
There are two types of phone scramblers: one that blocks radio waves and causes interference, and one that makes speech difficult to understand. You can use any of them to stop eavesdropping.
You can use a single encryption machine the same size as the apartment room to protect your privacy, so as not to be eavesdropped. Therefore, it can be expected to be an inexpensive method to prevent eavesdropping.
However, this method of preventing interference requires some precautions to be kept in mind.
Notes on using interference
Cannot completely prevent interception
There are two types of scramblers, but neither can completely interfere with listening.
The performance of 3G/4G mobile phone jammers that the general public can buy is very limited, and the type of blocking/blocking radio waves can interfere with radio waves up to 2.4Ghz, but cannot block radio waves beyond this range.
Also, the type of sound that is hard to hear does not mean that you can mute it by completely muting your voice, as the name implies.
You may need a license to use the scrambled device
Some models send mobile phone interference signals. This powerful interference radio can only be used with the permission of a third-level professional terrestrial radio technician.
If used by an undocumented person with interference model qualifications, a violation of the Radio Law will result in severe penalties.
Even if you block the interception of spies, it will interfere with the communication of the phone, so it is difficult to hear or hear the communication with the phone. There is a danger of touching people.
You will not be caught in commercial facilities or public transportation
Blocking commercial facilities or public transportation violates the Radio Law.
Even if it is unethical to use a mobile phone on a bus or train, do not bring the jammer into the car, but only use it as a jam avoidance device.
In order to prevent eavesdropping, there are plans to install interference in the home or office, but there are restrictions where interference can be installed and where interference can be used.