This is a brief overview of the regulatory information concerning license exempt low power
radio related to Circuit Designs radio modules.
The following two categories represent the major license exempt low power radio
Radio stations operating with extremely low power of emission
|Radio stations that emit
very low power. They are excluded from the category that requires technical regulation
conformity certification, but they are very low power stations.
Specified low-power radio stations
|To use radio with higher
output power, there are several categories of license exempt low power radio, but they
require technical regulation conformity certification. Specified low-power radio station
is the category that fits most of Circuit Designs radio modules. It allows emission
up to 10 mW.
operating with extremely low power of emission
This is the category for which there is no need for technical
regulation conformity certification.
Only the maximum field strength is specified as shown below.
Typical products used in this category are vehicle keyless entry systems that have
operating ranges of only a few meters. Maximum field strength allowed in this category is
very low compared with the RF power allowed by FCC part 15 or European regulation. The
practical operation range achievable with such low power is very limited.
Specified low power radio
This is the part where 1-10 mW of maximum RF power is allowed.
Generally, it requires the fulfillment of all of the following conditions.
| 1. Antenna power of 10 mW or less
2. Use of radio type and frequency as specified in the ministerial ordinance of the
Ministry of Public
Management, Home affairs, Post and Telecommunications (MPMHPT).
3. Not disturbance of the operations of other radio stations.
4. Only use of radio equipment with Technical Regulation Conformity Certification.
Among the many standards for specified low
power radio stations, the specific standard applicable to Circuit Designs radio
modules in the 400 MHz and 1200 MHz bands is RCR T-67. It covers most low power radio
applications. It specifies applications in the title as Telemeter, Tele-control and
Data Transmission Radio equipment for Specified Low Power Radio Stations. The
following table summarizes the specifications of the standard.
RCR STD-67 Telemeter, Telecontrol and Data Transmission Radio
Equipment for Specified
Low Power Radio Stations
frequency band (MHz)
communication,simplex operation, or broadcastcommunication
communication,simplex operation, broadcast communication,semi-duplex operation orduplex
all bandsallow continuoustransmission.
Some ranges of the bands have dutycycle restrictions.
radio modules with technical conformity certification in Japan
The following Circuit Design products have technical regulation conformity certification
to RCR standard. Customers can use them without further radio certification in
They are not listed in the English web page. Please find this information in our Japanese
||1216 MHz 1252 MHz
||806.375 MHz, 807.750MHz
806.625 MHz, 807.375 MHz
All the technical information
concerning products for the Japanese market is in Japanese.
Circuit Designs radio modules in 434 MHz and 869 MHz cannot be used in Japan as they
are not compliant with Japanese radio regulations.
Who offers technical conformity certification of radio products
Circuit Design does not offer conformity certification of
customers products in Japan.
It is recommended to use Circuit Designs radio modules that already have
certification in Japan. This is the easiest way if the modules are adaptable to your
To get technical conformity certification of your own products with RF parts, it is
recommended to find a partner in Japan who offers conformity certification procedures for
your products in Japan. As another way, it is recommended to use a European test
laboratory that offers certification for Japan. As far as we know, the following test
laboratory in Europe is authorized to issue Japanese approvals for radio equipment
including RCR STD-T67.
The following list shows links to the relevant pages of the radio regulatory authority
where you can find the technical standards and information for certification of your own
Please note that these links may not
always remain valid. This list is correct as of May 2003.