Chapter V High Frequency-Based Equipment
Section 1 General
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| (Method for Computing High-Frequency Output, and Other
Topics) |
| Article 58.3. |
Methods for measuring and computing high-frequency output generated
from high frequency-based equipment shall be announced (*).
(Announcement: * in No. 851 in 1959)
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Section
2 Communication Equipment
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| (Scope of application) |
| Article 58.4. |
The provisions in this Section shall apply to the communication
equipment for which a permit prescribed in Article 100 paragraph 1
item 1) of the Law is required.
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| (Frequency Tolerance) |
| Article 59 |
The tolerance of the frequency emitted from power line communication
equipment (which refers to the power line carrier communication equipment
prescribed in Article 44 paragraph 1 item 1; this also applies hereafter)
of the Enforcement Regulations; this also applies hereafter) or inductive
radio communication equipment (which refers to the equipment excluding
inductive reading and writing radio communication equipment (which
refers to the inductive reading and writing radio communication equipment
prescribed in item 3) (2) of the same paragraph; this also applies
hereafter) among inductive radio communication equipment prescribed
in Article 44 paragraph 1 item 3) of the Enforcement Regulations;
this also applies hereafter) shall be 1/1,000. Notwithstanding the
above provisions, the type of equipment for which that value should
be moderated according to the opinion of the Minister of Public Management,
Home Affairs, Posts and Telecommunications, as well as an available
frequency and a new value for the equipment, shall be defined separately
(*).
(Announcement: * in No. 118 in 1960)
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| Article 59.2 |
The tolerance of the frequency emitted from inductive reading and
writing radio communication equipment shall be 50/1,000,000.
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| (Permissible Level of Leakage Field Strength) |
| Article 60. |
The strength of the electric field generated by the carrier wave
of high-frequency current through a power line of power line communication
equipment shall be 500 µV per meter or less over 1 km or more
from the transmitter and at a point 
from the power line (where 
represents the wavelength of the carrier wave in meters; this also
applies hereafter).
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| Article 61. |
The strength of the electric field generated by the carrier wave
of a high-frequency current through a line for inductive radio communication
equipment shall be 200 µV per meter or less at a point
from the line except when this value
cannot be measured owing to topographical restrictions such as in
a tunnel in a coal mine or similar locations.
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| Article 61.2. |
The strength of the electric field generated by the carrier wave
emitted from inductive reading and writing radio communication equipment
shall be equal to or lower than the value specified in the items below
at a distance of 10 m.
| 1) |
47.544 mV/m in the frequency band of 13.553 MHz or higher
to 13.567 MHz |
| 2) |
1.061 mV/m in the frequency band of 13.41 MHz or higher to
lower than 13.553 MHz or higher than 13.567 MHz to 13.71 MHz |
| 3) |
316 µV/m in the frequency band of 13.11 MHz or
higher to lower than 13.41 MHz or higher than 13.71 MHz to 14.01
MHz |
| 4) |
150 µV/m at frequencies other than those specified
in item 3) above
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|
| Article 62. |
The strength of harmonics, subharmonics, or parasitic emissions
radiated from power line communication equipment or inductive radio
communication equipment shall be lower than that of the carrier wave
by 30 dB or more.
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| Article 62.2 |
The strength of harmonics or subharmonics radiated from inductive
reading and writing radio communication equipment shall be 50 µW
or less.
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| (Interference Prevention) |
| Article 63. |
To prevent interference with other communication equipment owing
to a high-frequency current flowing through the power line, power
line communication equipment shall comply with the conditions defined
in the items below:
| 1) |
A branch point of a power line through which a high-frequency
current flows shall be provided with a retardation coil to satisfy
the transmission characteristic requirements. |
| 2) |
There shall be few other lines and communication equipment
units near a power line through which a high-frequency current
flows.
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|
| Article 64. |
A line for inductive radio communication equipment through which
a high-frequency current flows shall not be linked with other transmitting
lines wherever possible to prevent interference with other communication
equipment.
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Section 3 Equipment
Other Than Communication Equipment
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| (Permissible Value of Electric Field Strength) |
| Article 65. |
Unless otherwise announced (*), the maximum permissible value of
the strength of the electric field generated by frequency emissions
used by or spurious emissions emitted from high frequency-based equipment
other than communication equipment shall be as follows.
| 1) |
Medical equipment: 100 µV per meter or less at
a distance of 30 meters (at the boundary between the site for
the building or construction in which the equipment is installed
and an adjacent area owned by the equipment owner if the distance
between the equipment and the boundary exceeds 30 meters) |
| 2) |
Industrial heating equipment: 100 µV per meter
or less at a distance of 100 meters (at the boundary between
the site for the building or construction in which the equipment
is installed and an adjacent area owned by the equipment owner
if the distance between the equipment and the boundary exceeds
100 meters) |
| 3) |
Miscellaneous equipment
| (1) |
Miscellaneous equipment providing a high-frequency
output of 500 W or less: Same as item 1)
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| (2) |
Miscellaneous equipment providing a high-frequency
output of higher than 500 W: Value specified in item 1)
multiplied by  (P
represents the high-frequency output in watts) that does
not exceed the value specified in item 2), or a lower
value |
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(Announcement: * in No. 257 in 1971)
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| (Interference Prevention) |
| Article 66. |
For the equipment defined in the preceding Article, measures required
for removing interference shall be taken according to requirements
defined separately if a high-frequency current leaking from the power
line, a high-frequency current induced in a nearby electric line,
or another current continuously causes or could cause serious interference
with other communication equipment.
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