The situation of License Free Radio System in Japan

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Japanese License Free Radio System is well-grounded in Article 4 in the law about the radio rule of Japan that was established in 1950. And the following two items were founded by an order of The Ministry of Internal Affairs and Communications.

[The Ministry of Internal Affairs and Communications notifies a condition of a toy transceiver and a device of radio control.]


1. The situation of Japanese Citizen Band radio.

The Japanese government accepted Citizen Band radio in 1961. 
As for Japanese CB the license as a radio station was necessary. 
Japanese CB became the license free radio in 1987.

1)The channel is restricted to the following 8 channels. 26.968, 26.967, 27.040, 27.080, 27.088, 27.112, 
   27.120 and 27.144 (MHz). 

2)The maximum antenna output is 0.5W only! 

3)Use of an external antenna is forbidden. A user must use rod/whip-antenna only has belong to  
   Transceiver.  And the length of a Rod antenna is a maximum of 2000mm only.

4)A user can decide a call sign by oneself. For example, it is a name, a nickname, a call sign format of a 
   user  for the purpose of an experiment is  [The place name + (alphabet) + numbers]. (ex. TOKYO ZZ999)

* Note(1)
As in Europe, made-for-the-USA CB and European CB radios are illegal in Japan. There have been cases where such radios have caused interference with maritime emergency traffic.

2. What is SLPR422 ? 

*SLPR422 is the UHF walkie-talkie system that a Japanese license free radio system such as American FRS and European PMR466. This SLPR422 started in 1989.

*The formal name ? 
SLPR422 is called "Talk-show" by a Japanese language. 
<Pronunciation is near and lends it, and meanings are completely different>
The SLPR422 formal name is "Voice Communication Radio Equipment for Specified Low Power Radio Station" this system, a license from government is unnecessary. Therefore, he/she can use it since the time that obtained everybody Transceiver. However the Transceivers must pass the authorization that Japanese government (The Ministry of Internal Affairs and Communications) established. 

*The condition ? 
1) Frequency to use is 422MHz band. (Basically, There are 20channels of Simplex.) 

) Because SLPR422 prepares 27 pairs of Duplex channels, repeater is marketed. (421/440MHz)
    And a user can establish repeater freely. Walkie-talkie which had a repeater function is marketed.

3) A walkie-talkie which had the function of digital modulation was marketed in 2004.

4) Antenna output is Maximum 10mW. as for the gain of antenna, there are maximum 2.14dBi . 

5) An external antenna is prohibited. : A user must use only whip-antenna has belong to Transceiver. 

6) Remodeling of the Transceiver is prohibited. 
    (A producer makes a seal on Transceiver. When a seal was broken, a producer declines repair.) 
   It is free that a user is connected to other device as for as a user does not disturb a seal. Therefore, as a 
   user, production of an Interface device for Link to Internet (eQSO for PMR446) and Repeater is 
   possible. Walkie-talkie which had an Vo-ip function is marketed in 2006.
   "" is eQSO Server for PMR446 network which is the most famous in Japan.

Server Information :
Server :  
Port: 10024 
Password: blank

7) A user can decide a call sign by oneself. For example, it is a name, a nickname, a call sign format of a 
    user for the purpose of an experiment is [The place name + alphabet + numbers]. (ex. TOKYO ZZ 999) 

* Various uses 
SLPR422 is active at various places. For example, Communication of the construction spot, Communication for administration of an event, Communication of leisure, an experiment of an radio wave and A Link experiment with Internet, etc. 

* Transmission distance of SLPR422? 
It is said 5km generally in about 1km and the suburbs in a town area. 
However, as a result of our experiment, we got a result to be more than 20km in the suburbs more than 3km in a town area. I had succeed contact who other user for distant 132km. 

*<DX record>
The longest DX record of SLPR422 is 331.5km.
(at 0955JST on 30
Jul 2006 by ItabashiAB303 and IshikawaAS36)



3. The Frequency Chart of Japanese Citizen Band radio & SLPR422.
(C)2006 written by KanagawaA707
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