This standard applies to the construction, reconstruction and expansion of AM radio stations with a receiving signal frequency of 526.2kHz-26.1MHz and FM TV relay stations with a receiving signal frequency of 48.5MHz-223MHz, as well as expressways, first-class and second-class special highways for automobiles (hereinafter collectively referred to as "highways"). GB 50285-1998 Standard for the protective distance between AM radio stations and FM TV relay stations and highways-98 GB50285-1998 Standard download decompression password: www.bzxz.net

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National Standard of the People's Republic of China
GB50285-98
Standard for protection distance from highwayto AM,FM and TV rebroadcasting stations
1998-09-03
State Administration of Quality and Technical Supervision
Ministry of Construction of the People's Republic of China
Engineering Construction Standard Full-text Information System
1999-02-01
Jointly Issued
Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Standard for protection distance from highwayto AM,FM and TV rebroadcasting stations GB5028598
Editing department: Ministry of Radio, Film and Television of the People's Republic of ChinaApproving department: Ministry of Construction of the People's Republic of ChinaEffective date: February 1, 1999
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Notice on Issuing the National Standard "Standard for the Protective Distance between AM Radio and FM Television Relay Stations and Highways"Jianbiao [1998] No. 15
According to the requirements of Document No. Jizong [1991] 290 of the State Planning Commission, the "Standard for the Protective Distance between AM Radio and FM Television Relay Stations and Highways" jointly formulated by the former Ministry of Radio, Film and Television and relevant departments has been reviewed by relevant departments. The "Standard for the Protective Distance between AM Radio and FM Television Relay Stations and Highways" GB50285-98 is now approved as a mandatory national standard, which will be implemented on February 1, 1999. This standard is managed by the State Administration of Radio, Film and Television, and the specific interpretation and other work is undertaken by the Standardization Planning Institute of the State Administration of Radio, Film and Television. The publication and distribution is organized by the Standard and Quota Institute of the Ministry of Construction.
Ministry of Construction of the People's Republic of China
September 3, 1998
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Protection Distance
Appendix A
Appendix B
Calculation Method of Protection Distance
Explanation of Terms Used in This Standard.
Additional Explanation…
Engineering Construction Standard Full Text Information System
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1.0.1. This standard is formulated to ensure that the AM radio station and the FM TV relay (including differential) station (hereinafter collectively referred to as the "receiving station") maintain a certain distance from the nearby expressways, first-class and second-class special highways, and to achieve economic rationality and normal operation. 1.0.2 This standard applies to the construction, reconstruction and expansion of AM radio stations with a receiving signal frequency of 526.5kHz to 26.1MHz and FM television relay stations with a frequency of 48.5MHz to 223MHz, as well as expressways, first- and second-class dedicated highways for automobiles (hereinafter collectively referred to as "highways").
1.0.3 In addition to complying with this standard, the construction of receiving stations and highways shall also comply with the provisions of the relevant national mandatory standards in force.
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Protection Distance
2.0.1 The protection distance between the receiving station and the highway shall not be less than that specified in Table 2.0.1. Protection Distance between the Receiving Station and the Highway (m)
Receiving Station Category
Highway Class
Expressway
First and Second Class
Dedicated Highway
AM Radio Station
FM relay station
TV relay station
Note: The protection distance refers to the horizontal distance from the outer edge of the shoulder of the highway close to the receiving station to the nearest receiving antenna of the receiving station.
2 When the protection distance of the FM TV relay station does not meet the requirements of Table 2.0.1, it can be measured and calculated in accordance with Appendix A of this standard "Calculation method of protection distance". If it still does not meet the requirements, the following protection measures can be selected to reduce interference: 2.0.2.1 Shielding measures can be used on the outer edge of the highway close to the receiving station to suppress interference radiation;
2 When the highway passes near the receiving station, it is advisable to pass from the side of the receiving station that is not the main receiving signal direction;
2.0.2.3 It is advisable to improve the receiving antenna of the receiving station by using methods such as elevated antennas or selecting antennas with strong directivity;
4 Methods such as microwave or satellite transmission signals can be used to change the signal transmission method.
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Appendix A
Calculation Method of Protection Distance
The protection distance of FM TV relay station should be calculated as follows: D=10x2mg+
Wherein, D——protection distance (m);
N10——the statistical field strength value of radio interference at a distance of 10m from the highway with a given confidence level and time probability, which can be taken according to Table A.0.1; S——field strength value of FM TV receiving signal ( dBμV/m); the required signal-to-noise ratio for FM (including stereo) broadcasting should be calculated as 27dB, and the required signal-to-noise ratio for TV broadcasting should be calculated as 39dB; B-the attenuation of interference field strength per octave distance should be calculated as 6dB. The measured statistical field strength value of N1o (dBμV/m) Receiving station category
Highway level
Expressway
, second-level automobile
Special highway
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Television Relay Station
VHF(I)
VHF(I)
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、Terms Used in This Standard
Appendix B
B.0.1 When implementing the provisions of this standard, the terms used to indicate the degree of strictness are explained as follows so as to distinguish between them during implementation:
B.0.1.1 means very strict, not so strict Words that cannot be done: positive words use "must"; negative words use "strictly prohibited"
B.0.1.2 Words that indicate strictness and should be done in normal circumstances: positive words use "should"; negative words use "should not" or "must not"B.0.1.3 Words that allow a little choice and should be done first when conditions permit: positive words use "should" or "may"; negative words use "should not".
The wording style for specifying that the provisions of other relevant standards and specifications should be followed in the articleB.0.2
is "should be followed" or "should comply with the requirements or provisions of...". Engineering Construction Standards Full-text Information System
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Additional Notes
List of the editorial unit, participating units
and main drafters of this standard
Editorial Unit: Standardization Planning Institute of the Ministry of Radio, Film and Television Participating Unit: Highway Planning and Design Institute of the Ministry of Communications Main Drafters: Chang
Wei Shixiu Ren Yi Liu Xingyu
Ge Sun Guian
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