Land mobile earth stations for land mobile satellite communications shall be permitted to, whenever necessary, communicate with maritime and aeronautical mobile satellite stations.

Ship stations shall be permitted to, upon receipt of the communications request of a coast station, transmit the signal via the same radio frequency and frequency tolerance as that of the coast station.

Aircraft stations shall be permitted to, in the case of distress call and rescue communications, use the radio frequency for maritime communications in accordance with Chapter 30 to Chapter 34 and Chapter 51 of ITU Radio Regulations.

Aeronautical earth stations shall be permitted to use the radio frequency for maritime satellite communications to access the public telecommunications network via satellite system.

Emission designation and used bandwidth shall comply with Appendix 2 “Classification of emissions and necessary bandwidths”.

• Appendix 2 Classification of emissions and necessary bandwidths.pdf

The emission of radio frequency shall be as precise and stable as possible, and shall conform to the requirements stated in Appendix 3 “Table of transmitter frequency tolerances”.

• Appendix 3 Table of Transmitter Frequency Tolerances.pdf

Emission of radio frequency shall conform to the requirements stated in Appendix 4 “Table of Maximum Permitted Spurious Emissions Power Levels.”

• Appendix 4 Table of Maximum Permitted Spurious Emissions Power Levels.pdf

Damped waves are forbidden in the emission of radio frequency.

Any emission that can harm legal radiocommunications shall be deemed as interference.

In order to prevent and reduce interference, users shall pay attention to and adhere to the following rules:
1. Avoid unnecessary communications and superfluous signals.
2. Pay special attention to possible interference when selecting the location of installing radio equipment.
3. Effective use of directional antenna so as to reduce transmission towards undesired directions.
4. The type of emission of the radio equipment should choose the smallest bandwidth.
5. Avoid radio receivers being placed too close to the equipment that produces radio frequency.
6. Avoid poorly designed radio reception equipment.
7. Avoid poor grounding of radio equipment.
8. Adequate safeguards and proper grounding must be adopted in the manufacturing, installation and use of various communication and non-communication equipment to avoid interference to radiocommunications.

To avoid interferences, users must not carry out any of the following acts:
1. The emitted frequency and power of radio equipment do not conform to the assignment of the competent authority.
2. The radio equipment produces spurious (including harmonic) emission that does not conform to the regulations.
3. The radio equipment does not conform to technical specifications.
4. Other factors that can harm legal radiocommunications.

The following circumstances shall be deemed as illegally using radio frequency to interfere with legal radio communications:
1. Use equipment of legal radiocommunications system to receive perceivable sounds or images of illegally used radio frequency.
2. Use measuring equipment to measure identifiable messages of illegally used radio frequency, which can affect system operations, in the legal radiocommunications system.
3. In more than five different points within the transmission radius of the antenna of legal stations (i.e. conform to the “Administrative Regulations on the Establishment of Radio and TV Broadcast Station”), the electric field strength between illegally used radio frequency and legal station exceeds any of the following standards: 34 decibel microvolts per meter for a co-channel; 48 decibel microvolts per meter for a first adjacent channel; 64 decibel microvolts per meter for a second adjacent channel; or 74 decibel microvolts per meter for a third adjacent channel.
4. The electric field strength of illegally used radio frequency has been measured using the equipment of competent authority’s fixed monitoring station, where the electric field strength of frequency between 9 kHz and 174 MHz exceeds 80 decibel microvolts per meter, or that of frequency between 174 MHz and 3GHz exceeds 90 decibel microvolts per meter.

Subparagraph 1 to Subparagraph 3 of the preceding Article may be applied mutatis mutandis to the determination of interference between radiocommunications stations, unless otherwise specified by laws.
Where the electric field strength of radiocommunications exceeds Paragraph 4 of the preceding Article it shall be deemed as interference.
In regard to applications of establishing a new station or relocating the station, if the electric field strength exceeds the standards as prescribed in Subparagraph 4 of the preceding Paragraph, the competent authority shall require the user to submit a plan outlining improvement procedures.
An application of users who fail to submit an improvement plan as prescribed in the preceding Paragraph, shall be rejected.

Prior to submitting a complaint about radio frequency interference, users shall determine the source of interference and submit Appendix 5 “Radio Frequency Interference Complaint Form” and relevant documents; the complaint shall be handled in accordance with the following procedures:
1. Complaints concerning interference to military communications shall be accepted, checked and excluded by Ministry of National Defense. Where the source of interference signal cannot be verified, users may contact the competent authority for investigating the source of interference and resolving actions to handle the interference.
2. Complaints concerning interference to non-military communications and interference complaints from overseas shall be accepted, checked and excluded by the competent authority. Where the source of interference signal cannot be verified, users may contact the Ministry of National Defense for resolving actions.

• Appendix 5 Radio Frequency Interference Complaint Form.pdf

Competent authority’s principles of handling interference are as follows:
1. Interference occurring between military and non-military radiocommunications shall be coordinated and handled by the Ministry of National Defense and competent authority.
2. Where used radio frequency is interfered, the radio frequency assigned by the competent authority shall be protected.
3. Where the measurement of radio frequency is disputable, the results of measurements undertaken by the competent authority shall be taken as the criterion.
4. Where interference unavoidably occurs among legal radiocommunications, the competent authority shall contact and negotiate with involved users respectively to adjust their use time or assign other suitable radio frequency.
5. Where interference occurs between domestic and foreign users, the competent authority shall coordinate with relevant units to solve the problem, whether the interference occurs within or outside the country.
6. Where the source of interference is from overseas, the competent authority shall collect relevant information and handle the issue in accordance with ITU Radio Regulations.

The competent authority shall handle the interference according to the following priorities and order:
1. Military radio frequency shall be deemed highest first priority in the mobilization implementation phase;
2. Aviation safety mission;
3. Disaster prevention and rescue mission;
4. Importance of the nature of business;
5. Radio frequency assigning date.

Those who use radio equipment to emit radio frequency and result in interference shall undertake corrective action using effective technology upon receipt of the competent authority’s notification. Whenever necessary, the user shall suspend the operations of said equipment. Where the interference cannot be eliminated, transmissions must cease immediately.