Low-power Radio-frequency Devices
Technical Regulations
August, 2007
Contents
Preface
1 Terminology 1
2 General requirements 4
3 Conformance specifications (by frequency ranges) 7
3.1 Operation within the band 1.705-10MHz(Frequency bands:1.705-10 MHz.) 7
3.1.1 Type of device: any radiated device. 7
3.2 Operation within the band 13.553-13.567 MHz 7
3.2.1 Type of device: any radiated device. 7
3.3 Operation within the band 26.29 - 27.28 MHz 7
3.3.1 Type of device: any radiated device. 7
3.4 Operation within the bands 40.66 - 40.70 MHz and above 70 MHz 7
3.4.1 Type of device: perimeter protection systems 7
3.4.2 Type of device: intermittent or periodic devices. 8
3.4.3 Type of device: any radiated devices except for those described in Section 3.4.1 and 3.4.2. 9
3.5 Operation within the band 49.82-49.90MHz 9
3.5.1 Type of device: any radiated device. 9
3.6 Operation within the band 72.0-73.0MHz 10
3.6.1 Type of device: Auditory assistance device. An intentional radiator used to provide auditory assistance to a handicapped person or persons. Such a device may be used for auricular training in an education institution, for auditory assistance at places of public gatherings, such as a theater, auditorium or meeting. 10
3.7 Operation within the band 88.0-108.0MHz 10
3.7.1 Type of device: any radiated device. 10
3.8 Operation within the bands 174.0-216.0 MHz and 584MHz-608MHz 10
3.8.1 Type of device: Operation under the provisions of this Section is restricted to biomedical telemetry devices which are the intentional radiators used to transmit measurements of either human or animal biomedical phenomena to a receiver. 10
3.8.2 Type of device: Operation under the provisions of this Section is restricted to biomedical telemetry devices which are the intentional radiators used to transmit measurements of either human or animal biomedical phenomena to a receiver. Such device is restricted to operate only in hospitals but does not extend to mobile vehicles, such as ambulances, even if those vehicles are associated with a health care facility. 11
3.9 Operation within the band 216-217MHz 11
3.9.1 Type of device: The purpose is for voice or data transmission, but two-way communications is prohibited. The applicable devices are listed below: 11
3.10 Operation within the bands 2400.0-2483.5MHz, 5725.0-5875.0MHz and, 24.0-24.25GHz 12
3.10.1 Type of device: Intentional radiators employing frequency hopping spread spectrum or digital modulation techniques. 12
3.10.2 Type of device: any radiated device 15
3.11 Operation within the bands 2435.0-2465.0MHz, 5785.0-5815.0MHz, 10500.0-10550.0MHz and, 24075.0-24175.0MHz 15
3.11.1 Type of device: Intentional radiators used as field disturbance sensors are devices that establishes a radio frequency field in its vicinity and detects changes in that field resulting from the movement of persons or objects within its range, while excluding perimeter protection systems. 15
3.12 Operation within the bands 2.9-3.26GHz, 3.267-3.332GHz, 3.339-3.3458GHz and, 3.358- 3.6GHz
3.12.1 Type of device: Automatic vehicle identification systems, AVIS, which use swept frequency techniques for the purpose of automatically identifying transportation vehicles. 16
3.13 Operation within the band 76.0-77.0GHz 17
3.13.1 Type of device: restricted to vehicle-mounted field disturbance sensors used as vehicle radar systems. The transmission of additional information, such as data, is permitted provided the primary mode of operation is as a vehicle-mounted field disturbance sensor. Operation under the provisions of this section is not permitted on aircraft or satellites. 17
4 Conformance specification of special devices 18
4.1 Tunnel radio systems: An intentional radiator utilized as a communication transceiver by the people work in the tunnel. 18
4.2 Cable locating equipment: An intentional radiator used intermittently by trained operators to locate buried cables, lines, pipes and similar structures or elements. Operation entails coupling a radio frequency signal onto the cable, pipe, etc. and using a receiver to detect the location of that structure or element. 18
4.3 Radio control devices: including the remote controlled devices for model toys, industrial purposes and also the radio data transceivers. 18
4.3.1 The remote controlled devices for model toys: The remote controlled devices for model toys: including a model aircraft device or a model surface craft device 18
4.3.2 Radio controlled devices for industry: Radio frequency transceiver used only in the factory building for transmitting digital control signal . 20
4.3.3 Radio data transceiver: Radio transceiver used restricted inside the building for voice, images and data communication. 20
4.4 Citizens band radio service. 21
4.5 Family radio service。 22
4.6 Low power wireless microphone and wireless earphone 23
4.7 Unlicensed national information infrastructure devices. 24
4.8 Radio Frequency Identification (RFID) devices operating in UHF band. 27
4.9 Auto, motorcycle theft-proof remote control 28
4.10 Assistive vision disabled communication devices 29
4.11 Medical Implant Communications Service (MICS): is a medical service system specifically for transmitting data in support of diagnostic or therapeutic functions between an external programmer/control transceiver and an active medical implant transceiver placed in the human body. 29
5 Inspection rules 32
Appendix Measurement on low power radio frequency devices 37
Appendix I Measurement on intentional radiators 37
Appendix II Measurement Guidelines for Direct Sequence Spread Spectrum 45
Appendix III Measurement Guidelines for Frequency Hopping Spread Spectrum Systems 47
30
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Low-power Radio-frequency Devices Technical Regulations
Preface
This regulation is formulated based on Section 1 of Article 50 of ”Telecommunications Act” and Section 1of Article 5 of “Administrative Regulations on Low Power Radio Waves Radiated Devices”. It consists of five chapters: Chapter 1 explains the related terminology. Chapter 2 lists the general requirements on the operating bands, radiated field intensity, performances and manufacture, installation, possession, import and sales. The Low-power radio-frequency devices in this chapter are not restricted to the use except otherwise regulated by other laws (codes). Chapter 3 and Chapter 4 are conformity specifications. In these two chapters, limitation on the frequency bands and radiated field intensity is restricted and corresponding to the frequency bands and the type of device. Those not stipulated in these two Chapters shall comply with the provisions in Chapter 2. Chapter 5 covers test requirements of type approvals on low-power radio-frequency devices.
1 Terminology
1.1 Radio frequency (RF) energy: Electromagnetic energy at any frequency in the radio spectrum (locating in the frequency range) between 9 kHz and 300 GHz.
1.2 Carrier: Radio frequency energy generated by the Low power radio frequency devices before modulation. In other words, the carrier wave without been modulated.
1.3 Spurious emissions: Emissions on a frequency (or frequencies) which are outside the necessary bandwidth and the level of which may be reduced without affecting the corresponding transmission of information. Spurious emissions include harmonic emissions, parasitic emissions, intermodulation products and frequency conversion products, but exclude out-of-band emissions.
1.4 Out-of-band emissions: Due to modulation process, emissions on a frequency (or frequencies) which are outside the necessary bandwidth. The spurious emission is exclusive.
1.5 Unwanted emissions: Encompass spurious emissions and out-of-band emissions.
1.6 Necessary bandwidth: Under regulations, the bandwidth required to ensure necessary speed and quality of transmitted information.
1.7 Instantaneous frequency: The time rate of change in phase in radians divided by 2π, the unit is Hz.
1.8 Peak frequency deviation: The half the difference between the maximum and minimum values of the instantaneous frequency.
1.9 Harmful interference: Any emission, radiation or induction that endangers the functioning of a radio navigation service or of other safety services or seriously degrades, obstructs or repeatedly interrupts a radio communications service operation served by legal radio communication business enterprise.
1.10 Damped waves: The strength of the radio wave increases rapidly and then decreases gradually until nil.
1.11 Effective radiated power (e.r.p): The product of the power supplied to the antenna and its gain relative to a half-wave dipole in a given direction.
1.12 Unlicensed national information infrastructure (U-NII) devices
(1) Average symbol envelope power: The average symbol envelope power is the average, taken over all symbols in the signaling alphabet, of the envelope power for each symbol.
(2) Digital modulation: The process by which the characteristics of a carrier wave are varied among a set of predetermined discrete values in accordance with a digital modulating function as specified in document ANSI C63.17-1998.
(3) Emission bandwidth: For purposes of this subpart the emission bandwidth shall be determined by measuring the width of the signal between two points, one below the carrier center frequency and one above the carrier center frequency, that are 26 dB down relative to the maximum level of the modulated carrier. Determination of the emissions bandwidth is based on the use of measurement instrumentation employing a peak detector function with an instrument resolution bandwidth approximately equal to 1.0 percent of the emission bandwidth of the device under measurement.
(4) Peak power spectral density: The peak power spectral density is the maximum power spectral density, within the specified measurement bandwidth, within the U-NII device operating band.
(5) Peak transmit power: The maximum transmit power as measured over an interval of time of at most 30/B (where B is the 26 dB emission bandwidth of the signal in hertz) or the transmission pulse duration of the device, whichever is less, under all conditions of modulation. The peak transmit power may be averaged across symbols over an interval of time equal to the transmission pulse duration of the device or over successive pulses. The averaging must include only time intervals during which the transmitter is operating at its maximum power and must not include any time intervals during which the transmitter is off or is transmitting at a reduced power level.
(6) Power spectral density: The power spectral density is the total energy output per unit bandwidth from a pulse or sequence of pulses for which the transmit power is at its peak or maximum level, divided by the total duration of the pulses. This total time does not include the time between pulses during which the transmit power is off or below its maximum level.
(7) Pulse: A pulse is a continuous transmission of a sequence of modulation symbols, during which the average symbol envelope power is constant.
(8) Transmit power: The total energy transmitted over a time interval of at most 30/B (where B is the 26 dB emission bandwidth of the signal) or the duration of the transmission pulse, whichever is less, divided by the interval duration.
(9) Transmit power control (TPC): A feature that enables a U-NII device to dynamically switch between several transmission power levels in the data transmission process.
(10) Channel availability check: A check during which the U-NII device listens on a particular radio channel to identify whether there is a radar operating on that radio channel.
(11) Dynamic frequency selection (DFS): is a mechanism that dynamically detects signals from other systems and avoids co-channel operation with these systems, notably radar systems.
(12) DFS Detection threshold: The required detection level defined by detecting a received signal strength (RSS) that is greater than a threshold specified, within the U-NII device channel bandwidth.
(13) Channel move time: The time needed by a U-NII device to cease all transmissions on the current channel upon detection of a radar signal above the DFS detection threshold.
(14) In-service monitoring: A mechanism to check a channel in use by the U-NII device for the presence of a radar.
(15) Non-occupancy period: The required period in which, once a channel has been recognized as containing a radar signal by a U-NII device, the channel will not be selected as an available channel.
2 General requirements
2.1 The low-power radio-frequency devices shall be self-contained with no external or readily accessible controls which may be adjusted to permit operation in a manner inconsistent with the provisions.
2.2 Antenna requirement: Low-power radio frequency transmitter or transceiver(receiver) shall utilize a permanently, half- permanently attached antenna or uses a unique coupling at the antenna and at any cable connector between the transmitter and the antenna. The antenna shall be omni-directional type. The manufacturer may design the unit so that the user can replace a broken antenna, but the use of a standard antenna jack or electrical connector or other than authorized is prohibited. Such standard connectors are for example: BNC, F type, N type, M type, UG type, RCA, SMA, SMB, and other standard type antenna connectors.
2.3 For Low-power radio-frequency devices that is designed to be connected to the public utility (AC) power line, the radio frequency voltage that is conducted back onto the AC power line on any frequency or frequencies, within the band 150 kHz to 30 MHz, shall not exceed the limits in the following table, as measured using a 50 [mu]H/50 ohms line impedance stabilization network (LISN). The lower limit applies at the boundary between the frequency ranges.
Frequency of emission (MHz) / Conducted limit (dBuV)Quasi-peak / Average
0.15-0.5 / 66 – 56(Note) / 56 – 46(Note)
0.5-5 / 56 / 46
5-30 / 60 / 50
Note: Decreases with the logarithm of the frequency.
2.4 The low-power radio-frequency devices that produce damped waves are prohibited.
2.5 The low-power radio-frequency devices must not be altered by changing the frequency, enhancing emission power, adding external antenna, and modification of original design characteristic as well as function.
2.6 The operation of the low-power radio-frequency devices is subject to the conditions that no harmful interference is caused. The user must stop operating the device immediately should harmful interference is caused and shall not resume until the condition causing the harmful interference has been corrected.
Moreover, the interference must be accepted that may be caused by the operation of an authorised communications, or ISM equipment.
2.7 The fundamental frequency of any low-power radio-frequency devices are restricted in any of the operation bands listed below; The spurious emissions are permitted in any of frequency band listed below and shall meet the field strength requirement of 2.8:
Frequency (MHz) / Frequency (MHz) / Frequency (MHz)0.090 - 0.110 / 162.01 - 167.17 / 3500.0 - 4400.0
0.490 - 0.510 / 167.72 - 173.20 / 4500.0 - 5250.0
2.172 - 2.198 / 240.00 - 285.00 / 5350.0 - 5460.0
3.013 - 3.033 / 322.00 - 335.40 / 7250.0 - 7750.0
4.115 - 4.198 / 399.90 - 410.00(Note 1) / 8025.0 - 8500.0
5.670 - 5.690 / 608.00 - 614.00 / 9000.0 - 9200.0
6.200 - 6.300 / 825.00 - 915.00 / 9300.0 - 9500.0
8.230 - 8.400 / 935.00 - 1240.0 / 10600 - 12700
12.265 - 12.600 / 1300.0 - 1427.0 / 13250 - 13400
13.340 - 13.430 / 1435.0 - 1626.5 / 14470 - 14500
14.965 - 15.020 / 1660.0 - 1755.0 / 15350 - 16200
16.700 - 16.755 / 1805.0 - 1850.0 / 17700 - 21400
19.965 - 20.020 / 2200.0 - 2300.0 / 22010 - 23120
25.500 - 25.700 / 2310.0 - 2390.0 / 23600 - 24000
37.475 - 38.275 / 2483.5 - 2500.0 / 31200 - 31800
73.500 - 75.400 / 2655.0 - 2900.0 / 36430 - 36500
108.00 - 138.00 / 3260.0 - 3267.0 / 38600 + (Note 2)
149.90 - 150.05 / 3332.0 - 3339.0
156.70 - 156.90 / 3345.8 - 3358.0
Note 1: 402 MHz - 405 MHz MICS systems (Section 4.11) are excluded.