This standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation and storage of channel changers (hereinafter referred to as components) in cable distribution systems for television and sound signals from 5MHZ to 1750MHz. This standard applies to channel changers in cable distribution systems for television and sound signals from 5MHZ to 1750MHz. GB/T 11318.5-1996 Cable distribution system equipment and components for television and sound signals Part 5: General specification for channel changers GB/T11318.5-1996 Standard download decompression password: www.bzxz.net

1 Scope
National Standard of the People's Republic of China
Equipment and components used in cabled distribution systems primarily intended for television and sound signals
Part 5: Generic specifications for channel converter
Equipments and components used in cabled distribution systems primarily intended for television and sound signals Part 5: Generic specifications for channel converter GB/T11318.5-1996
This standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation and storage of channel converters (hereinafter referred to as equipment) in cabled distribution systems for television and sound signals of 5MHz to 1750MHz. This standard applies to channel converters in cabled distribution systems for television and sound signals of 5MHz to 1750MHz. 2
Cited Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T11318.1-1996 Cable distribution system equipment and components for television and sound signals Part 1: General specifications 3 Requirements
3.1 General requirements
The general requirements for equipment shall comply with the provisions of 4.1.1 of GB/T11318.1-1996. 3.2 Performance parameters
The performance parameter requirements of the equipment are shown in Table 1.
Nominal value
Allowable deviation
VHF/VHF
VHF/UHF
UHF/VHF
UHF/UHF
Approved by the State Administration of Technical Supervision on 1996-09-09
Performance parameters
Specified by product standards
Measurement method
GB/T 11318. 1--1996
4. 2. 2. 2. 1
4.2.2.2.1
1997-05-01 Implementation
Accuracy
Total deviation
Out-of-band attenuation
Maximum output level
Working output level
VHF/VHF
VHF/UHF
UHF/VHF
UHF/UHF
AGC characteristics
VHF/VHF
UHF/VHF
VHF/UHF
UHF/UHF
VHF/VHF
UHF/UHF
3.3 Environmental adaptability
GB/T11318 .5—1996
Table 1 (end)
Performance parameters
≥110,≥115,≥120
≥105,≥110,≥115
When the input level changes by ±10,
The output level changes within ±1
Test method
GB/T11318.1--1996
4 .2.2.2.1
4.2.2.2.2
4.2.2.2.2
1.2.2.2.4
4.2.2.2.5
4.2.2.2.6
4.2.2.2.7
The environmental adaptability requirements of the equipment shall comply with the provisions of 4.3 of GB/T11318.1-1996. The intermediate test item is gain, and the test result should not vary more than ±3dB relative to the initial test value. The test items after high temperature, constant humidity and heat, swept frequency vibration, and collision tests are gain and in-band fluctuation. After low temperature test and free fall test, performance test shall be carried out according to the items specified in Table 1, and the test results shall comply with the relevant provisions of Table 1. 3.4 Reliability
The lower limit of the reliability index of the equipment, MTBF (mean time between failures), shall not be less than 10,000 hours. The failure criterion is that the output level changes more than ±3 dB compared with that before the test or the accompanying sound is abnormal. 3.5 The safety requirements of the equipment shall comply with the provisions of 4.5 of GB/T11318.1-1996. 3.6 Electromagnetic compatibility
The electromagnetic compatibility requirements of the equipment shall comply with the provisions of 4.6 of GB/T11318.1-1996. 4 Test methods
4.1 General requirements
The test methods for the general requirements of the equipment shall be carried out in accordance with the provisions of 4.1.2 of GB/T11318.1-1996. 4.2 Performance parameters
The performance parameter measurement methods of the equipment shall be carried out in accordance with the relevant provisions of 4.2.2 of GB/T11318.1-1996. 358
4.3 Environmental adaptability
GB/T11318.5—1996
The environmental adaptability test method of the equipment shall be carried out in accordance with the relevant provisions of 4.3 of GB/T11318.1-1996. The test temperature group is Group 1. wwW.bzxz.Net
4.4 Reliability
The reliability test method of the mixer shall be carried out in accordance with the relevant provisions of 4.4 of GB/T11318.1-1996. The test plan is Plan I. 4.5 Safety
The safety test method of the equipment shall be carried out in accordance with the relevant provisions of 4.5 of GB/T11318.1-1996. 4.6 Electromagnetic compatibility
The electromagnetic compatibility test method of the equipment shall be carried out in accordance with the relevant provisions of 4.6 of GB/T11318.1--1996. 5 Inspection rules
The inspection rules of the equipment shall comply with the provisions of Chapter 5 of GB/T11318.1-1996. The main electrical performance parameter test items during the delivery inspection are the in-band fluctuation working output level and AGC characteristics. Marking, packaging, transportation and storage
The marking, packaging, transportation and storage of the equipment shall comply with the relevant provisions of Chapter 6 of GB/T11318.1-1996. 359
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