A license-free radio is a radio that you can use freely without a license. When you hear license-free radio, it sounds like hobby use, but it is originally a radio that has been widely institutionalized for business use. There are several types for each frequency band, and the easiest to use is the specified low power radio, which is called “extra small” for short. Let’s take a closer look at the specified low power radio.
Financial benefits for specific low power radio
There is also a digital system for specified low power radio, but the price is high and the number of users is limited. Almost all use analog waves so they can be received. However, the specified low power radio is equipped with a voice reversal type secret talk mode, and although you can understand the intonation of the conversation, the voice can only be heard as “mogamoga”.
A receiver equipped with a decoding function is required to return to audio. Without the decryption function, neither hands nor legs will come out. However, when I actually received it, there were very few cases where I used a secret story. It’s a specific low-power wireless that can be used easily, so it probably doesn’t have any extra settings.
If you hear a secret story communication, you can go through it. This is because there are many calls on the specified low power radio, so you can hear more interesting communications. Let’s receive it comfortably with such a feeling.
Specified low power radio also has financial benefits. As the name of “Registration”, the digital simple radio registration station of the same license-free radio needs to send the registration documents to the general communication station, and a fee of 2,900 yen will be charged at that time. In addition, the annual radio usage fee is 400 yen per unit.
A big disadvantage for specific low power radio
On the other hand, the specified low power radio does not require any of these costs. Business users are paying attention to it because there is no maintenance cost for the radio. By switching from simple wireless to specific low-power wireless, industries that had no connection with wireless have begun to introduce specific low-power wireless.
Although it is a specific low power radio with only advantages, it also has major disadvantages. That is, the transmission output, which affects the flight distance of radio waves, is very weak. While the simple radio can output up to 5W, the extra small is only 0.01W (10mW), which is 1/500.
Although it is very small in terms of numerical values, the communication distance is approximately 100 to 200 m. This is a distance that can be used even on the floor of a large store or in a parking lot. However, I am not good at making calls on the upper and lower floors because the floor and ceiling are shields.
The short communication distance means that reception is done on-site. Aggressive reception with a sense of distance that allows the user using the specified low power radio to be seen is required. (Sentence / Hitoshi Sato)
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