SJ 20728-1999 General Specification for Low Frequency/Very Low Frequency Transmitters
Some standard content:
Military standard for electronics industry of the People's Republic of China FL5820
SJ20728—1999
General specification for LF/VLF transmitters1999-11-10 Issued
1999-12-01 Implementation
Approved by the Ministry of Information Industry of the People's Republic of China1
Referenced documents
Quality assurance provisions
Delivery preparation
Notes
iiiKAoNrkAca
1 Scope
Military standard for electronics industry of the People's Republic of China General specification for LF/VLF transmitters
1.1 Subject content
SJ 20728—1999
This specification specifies the requirements for low frequency/very low frequency transmitters (hereinafter referred to as transmitters), quality assurance regulations, delivery preparation and instructions, etc.
1.2 Scope of application
This specification applies to terrestrial low frequency/very low frequency communication transmitters. 2 Referenced Documents
GJB150.16—86 Environmental test methods for military equipment Vibration test GJB151A—97 Requirements for electromagnetic emission and sensitivity of military equipment and subsystems GJB152A-97 Measurement of electromagnetic emission and sensitivity of military equipment and subsystems GJB179A-96 Counting sampling inspection procedures and tables GJB367.1-87 General technical conditions for military communication equipment Design and manufacturing requirements General technical conditions for military communication equipment Environmental test methods GJB 367.2--87
General technical conditions for military communication equipment Reliability identification test and acceptance test methods GJB 367.3—87
General technical conditions for military communication equipment Acceptance rules GJB 367.487
General technical conditions for military communication equipment Packaging, transportation and storage requirements GJB 367.587
General outline for equipment maintainability
GJB 368A—94
GJB 663--89
GJR 1145--91
Safety requirements for military communication equipment and systems
Procedures for type test and identification test of military communication equipmentMaintenance test and evaluation
GJB 2072—94
Electrical performance measurement method of low frequency/basic low frequency transmitterSJ20566—96
3 Requirements
3.1 Qualification
Products submitted in accordance with this specification shall be qualified or approved for type. 3.2 Design
The design of the transmitter shall comply with the provisions of Chapter 1 of GJB367.1. The basic functional characteristics of the transmitter are as follows:
The Ministry of Information Industry of the People's Republic of China issued on November 10, 1999 and implemented on December 1, 1999
SJ 20728--1999
a. Modulation system of the transmitter: OOK, FSK, MSK, PSKb. Control mode of the transmitter: local control, remote control: C. Input mode of the transmitter: manual key input (for OOK, FSK and PSK), data stream input (for all modulation systems).
Specific functional characteristics are specified by product specifications. 3.3 Structure
The structure of the transmitter shall comply with the requirements of Article 1.15 of GJB367.1. The structural design of the transmitter shall be universal, serialized and modular, capable of quickly replacing spare parts, easy to install and maintain, and meet the requirements of Article 1.9 of GJB 367.1. 3.4 Appearance Quality
The appearance of the transmitter should be free of dents, bumps, cracks, deformation, etc.; the coating should not bubble, crack or fall off; the metal parts should not be rusted or have other mechanical damage; the fasteners should not be loose; various signs and text symbols should be clear, and the graphics, text and abbreviation symbols should comply with the relevant standards. 3.5 Dimensions and Weight
The overall dimensions and weight of the transmitter should meet the requirements of Article 1.14 of GIB 367.1. The specific overall dimensions and weight are specified by the product specifications.
3.6 Product Marking
The product specification should specify the location, content, sequence and production requirements of the marking. The content of the product marking should at least include:
a. Product name and model:
b. Production batch number or manufacturing date:
C. Manufacturer name (or code).
3.7 Safety
The transmitter safety design shall comply with the requirements of Article 1.8 of GJB367.1. The transmitter item safety requirements shall comply with the provisions of GJB 663. 3.8 Maintainability
The transmitter maintainability shall comply with the relevant provisions of Article 1.6 of GJB 367.1 and GJB 368A, and shall have fault display and self-checking functions.
The mean time to repair (MTTR) of the transmitter shall not exceed 30min. 3.9 Interchangeability
The transmitter interchangeability shall comply with the requirements of Articles 1 and 7 of GJB367.1. After replacing the same module, the performance indicators of the transmitter shall comply with the requirements of the product specification. 3.10 Performance characteristics
3.10.1 Frequency range (see Article 4.7.6.1) Frequency range: 10160kHz, or as specified by the product specification. 3.10.2 Frequency interval (see 4.7.6, 2) Frequency interval: 10Hz, or as specified by product specifications. 3.10.3 Frequency stability (see 4.7.6.3) Frequency stability; better than 1×10-%/d.
3.10.4 Frequency error (see 4.7.6.4) - 2 -
iKAoNrKAca
Frequency error: ≤1x10-1.
SJ 20728—1999
3.10.5 Rated output power (see 4.7.6.5) Rated output power: 20, 50, 100, 200, 500, 1000, 2000kW. 3.10.6 Harmonic level (see 4.7.6.6) Spectral wave level: ≤-50 dB.
3.10.7 Total efficiency (see 4.7.6.7)
Total efficiency: not less than 70% (semiconductor power amplifier), not less than 50% (tube power amplifier). 3.10.8 Noise (see 4.7.6.8)
When using internal air cooling, the noise is less than 70 dB (A) 3.11 Environment
3.11.1 Ambient temperature
Working temperature: -10～45°C, -10～55°C: Storage temperature: -50~～70°C.
3.11.2 Damp heat
The transmitter should be able to withstand the severe level test of ground communication equipment specified in Chapter 3 of "411 Damp Heat Test" in GJB367.2.
3.11.3 Vibration
Land fixed transmitters shall be able to withstand the vibration requirements of Figures 1 to 3 in Article 2.3.1 of GJB150.16, and land mobile transmitters shall be able to withstand the vibration test specified by Curve V in Table 409-~1 of "409 Vibration Test" in GJB367.2. 3.12 Continuous working time
Continuous working time: 24h.
3.13 Electromagnetic compatibility
The electromagnetic compatibility of the transmitter shall comply with the relevant provisions of GJB151A. 3.14 Reliability
The mean time between failures (MTBF) of the transmitter shall be greater than 1000h. 4 Quality assurance provisions
4.1 Inspection responsibilities
Unless otherwise specified in the contract or order, the contractor shall be responsible for completing all inspections specified in this specification. If necessary, the ordering party or the superior appraisal agency has the right to inspect any inspection item described in the specification. 4.1.1 Responsibility for Conformity
All equipment must comply with all requirements of Chapter 3 and Chapter 5 of the specification. The inspections specified in this specification shall become an integral part of the contractor's entire inspection system or quality program. If the contract includes the inspection requirements specified in this specification, the contractor shall also ensure that the products submitted for acceptance meet the contract requirements. Quality consistency sampling does not allow the submission of products that are known to be defective, nor can the ordering party be required to accept defective products. 4.2 Inspection Classification
The inspections specified in this specification are divided into:
a. Identification inspection:
b. Quality consistency inspection.
4.3 Environmental conditions
SJ 2072B--1999
Unless otherwise specified, various inspections shall be carried out in accordance with the conditions specified in Article 3.1.1 of GJB367.2. 4.4 Identification inspection
Identification inspection is generally carried out when the equipment is designed and produced, but it should also be carried out when there are major changes in the main design, process, components and materials of the equipment, which affect the important performance of the equipment: when the original identification conclusion is no longer valid.
For equipment produced in single pieces or in small quantities, identification inspection (technical identification) is carried out on the test prototype. The identification inspection should be carried out in a laboratory approved by the ordering party or the superior identification agency. 4.4.1 Sample quantity
During the identification inspection, the number of samples to be drawn shall meet the requirements of the batched samples and shall meet the requirements of Article 4.12.1 of GJB1145.
4.4.2 Inspection Items
Identification inspection items are shown in Table 1
Appearance quality
Dimensions and weight
Product marking
Safety
Maintainability
Interchangeability
Frequency range
Frequency interval
Frequency stability
Frequency error
Rated output power
Harmonic level
Total efficiency
Ambient temperature
Continuous working time
Electromagnetic compatibility
Reliability
Identification inspection
Quality consistency inspection
Required
Chapter No.
TTTKAoNr KAca-
Test method
Chapter number
SJ20728—1999
Note: "○" in the table indicates a required item, "△" indicates an optional item; "—" indicates an item not to be done 4.4.3 Qualification criteria
When all inspection items meet the requirements of Chapter 3 and Chapter 5, it is judged to be qualified for the identification inspection. If any inspection item does not meet the specified requirements, the inspection shall be suspended. The contractor shall analyze the unqualified items, find out the causes of the defects and take corrective measures, and then continue to inspect the unqualified items and related items. Or if all items continue to be inspected and meet the specified requirements, the identification inspection is still judged to be qualified; if there is still an item that does not meet the specified requirements after continuing the inspection, it is judged to be unqualified for the identification inspection. 4.4.4 Maintenance of qualification for identification
In order to maintain the qualification for identification inspection, the contractor should regularly provide routine test data or qualified certification data of the product according to the requirements of the ordering party or the superior identification agency. 4.5 Quality consistency inspection
4.5.1 Inspection grouping
Quality consistency inspection is divided into Group A, Group C and Group D inspection. 4.5.2 Formation of inspection batch
The formation of inspection batch shall comply with the provisions of Article 5.4.6 of GJB179A. 4.5.3 Group A inspection
4.5.3.1 Inspection items
The inspection items of Group A are shown in Table 1.
4.5.3.2 Sampling plan
100% of the inspection batch products submitted by the contractor shall be subject to Group A inspection. The batch quality of the A-dimensional inspection is expressed in terms of the number of defects per hundred units of products. The acceptable number of defects per hundred units of products shall be determined by the contractor and the ordering party through negotiation or selection of the following values: Number of serious defects: 10, 15, 25; number of minor defects: 40, 65, 100. The specific acceptable number of defects per hundred units shall be specified by the product specification: Defect classification see Article 4.8.
4.5.3.3 Qualification Criteria
The defective products shall be eliminated by inspecting the whole batch one by one. According to the inspection results, if the number of defects found is equal to or less than the specified value, the batch is judged to have passed the Group A inspection. Otherwise, the batch is judged to have failed the Group A inspection.
No fatal defects are allowed in the Group A inspection. Once a fatal defect is found, the batch shall be rejected. 4.5.3.4 Re-inspection
For batches that fail the Group A inspection, the contractor shall analyze the batch of products, find out the cause of the defects and take corrective measures before resubmitting them for inspection. The re-submitted batch shall be separated from the new batch and marked with "resubmitted batch". If the re-inspection is qualified, the batch is still judged to have passed the Group A inspection: if the re-inspection is still unqualified, the batch is judged to have failed the Group A inspection.
4.5.3.5 Sample Handling for Group A Inspection
If defective products are found in the batches that have passed the Group A inspection, the contractor shall be responsible for repairing them and after they meet the requirements of the product specifications, they can be delivered in batches according to the contract or order. 4.5.4 Group C Inspection
The Group C inspection shall be carried out on the products in the batches that have passed the Group A inspection. 5
4.5.4.1 Inspection Items
The inspection items for Group C are shown in Table 1.
4.5.4.2 Sampling Plan
SJ 20728—1999
The sampling plan for Group C inspection is: when the batch is not more than 8, one batch is selected; when the batch is more than 9, two batches are selected.
4.5.4.3 Qualification Criteria
When all the inspection items meet the requirements of Chapter 3 and Chapter 5 during the C group inspection, the C group inspection is qualified. If any of the inspection items do not meet the requirements of Chapter 3 and Chapter 5, the C group inspection is unqualified.
4.5.4.4 New Inspection
If the sample fails the new inspection, the acceptance and delivery of the product shall be stopped. The contractor shall notify the qualification appraisal unit of the unqualified situation. After finding out the cause and taking corrective measures, the inspection may be re-inspected. When re-inspecting, the number of samples shall be increased. The re-inspection shall be carried out according to the opinions of the ordering party or the qualification appraisal unit. All tests or inspections shall be carried out, or only the unqualified items shall be tested or inspected.
If the re-inspection is qualified, the C group inspection is qualified. If the re-inspection is unqualified, the unqualified situation shall be notified to the qualification appraisal unit.
4.5.4.5 Sample processing
Unless otherwise specified, samples that have passed the C group inspection can be delivered according to the contract after the contractor repairs the damage found or existing and passes the A group inspection. 4.5.4.6 Inspection cycle
When one of the following situations occurs, the C group inspection should generally be carried out: a. Trial and final product evaluation: b. When there are major changes in the structure, material, or process of the product, which may affect the product performance; c. During normal production, an inspection should be carried out periodically or after a certain amount of production has been accumulated; d. When the product is stopped for a long time and production is resumed. 4.5.5 D group inspection
D group inspection should be carried out on the products that have passed the A group inspection. 4.5.5.1 Inspection Items
The inspection items of Group D are shown in Table 1.
4.5.5.2 Sampling Plan
The inspection samples of Group D shall be randomly selected from the samples that have passed the inspection of Group A. The number of samples shall be specified by the product specification. 4.5.5.3 Sample Handling
Unless otherwise specified, for the samples that have passed the inspection of Group D, the contractor shall be responsible for repairing or replacing the parts that have consumed all or most of the design service life. After passing the inspection of Group A, they can be delivered according to the contract. 4.5.5.4 Inspection Cycle
The inspection of Group D shall be carried out in accordance with the requirements of the contract or agreement. 4.5.6 Non-conformity
If the sample fails the inspection of Group C or Group D, the acceptance and delivery of the product shall be stopped. The contractor shall notify the qualified appraisal unit of the non-conformity. After taking corrective measures, all tests or inspections shall be carried out again according to the opinions of the qualified appraisal unit, or only the non-conforming items shall be tested or inspected. If the test still fails, the unqualified situation should be reported to the qualified appraisal unit. 4.5.7 Handling of test results
sJ 20728--1999
According to the provisions of Chapter 5 of GJB 367.4. 4.6 Packaging inspection
According to the relevant provisions of Chapter 6 of GJB367.5. 4.7 Inspection plan
4. 7.1 General inspection
Measure or inspect the requirements of 3.3 to 3.6 with measuring tools in accordance with the provisions of the design documents. 4.7.2 Functional characteristics
Inspect according to the requirements of 3.2 and the operating instructions in the technical manual. 4.7.3 Safety
Inspect according to the requirements of 3.7 with visual inspection and the method specified in GJB663. 4.7.4 Maintainability
Inspect according to the relevant provisions of GJB2072. 4.7.5 Interchangeability
After replacing the same module, check that the transmitter can work normally. After a slight adjustment, the performance characteristics should meet the requirements. 4.7.6 Performance Characteristics
4.7.6.1 Frequency Range
Set the transmitter operating frequency to the lowest and highest frequencies respectively, adjust the machine according to the prescribed method, and after it reaches the prescribed warm-up time, use a frequency meter to measure the two frequencies respectively, which is the frequency range. 4.7.6. 2 Frequency Range
Use 4.7.6.1 method, and when the two frequencies are placed at adjacent operating frequencies, the difference between the two frequencies measured is the frequency difference.
4.7.6.3 Frequency stability
Measured in accordance with 5.2 of SJ20566.
4.7.6.4 Frequency error
Measured in accordance with 5.3 of SJ20566.
4.7.6.5 Rated output power
Measured in accordance with 5.1 of SJ20566.
4.7. 6, 6 Harmonic level
Measured in accordance with 5.5 of SJ20566.
4.7.6.7 Total efficiency
Measured in accordance with 5.10 of SJ20566.
4.7.6.8 Noise
Use a sound level meter to measure the noise value.
4.7.7 Environmental test
4.7.7.1 Environmental test sequence
The sequence of environmental test items shall be in accordance with the provisions of Appendix E (reference) in GJB367.2. 4.7.7.2 Initial measurement and final measurement items During the environmental test, the initial measurement and final measurement items are as follows: - 7 -
a. Rated output power:bzxZ.net
b. Harmonic level.
4.7.7.3 Environmental test methods
The environmental test methods are as follows:
$J 20728--1999
a. Low temperature test shall be carried out in accordance with the method specified in "401 Low temperature test" in GJB367.2. Temperature storage time, working time and recovery time are specified by product specifications. b. High temperature test shall be carried out in accordance with the method specified in "402 High Temperature Test" in GJB367.2. Temperature storage time, working time and recovery time are specified by product specifications. c. Vibration test, land fixed transmitter shall be carried out in accordance with the relevant provisions of Chapter 4 of GJB150.16, and land mobile transmitter shall be carried out in accordance with Method 1 of Article 5.1 of "409 Vibration Test" in GJB367.2. d. Wet heat test shall be carried out in accordance with Method 1 of Article 4.1 of "411 Heat Test" in GJB367.2. 4.7.8 Continuous working time
Adjust the transmitter in accordance with the prescribed method. After 24 hours of load, the transmitter shall be stable and the harmonic level shall meet the requirements of product specifications.
4.7.9 Electromagnetic compatibility
Electromagnetic compatibility test shall be carried out in accordance with the relevant provisions of GJB152A or the relevant provisions of product specifications. 4.7.10 Reliability
Reliability test shall be carried out in accordance with the relevant provisions of GJB367.3. The specific reliability test plan, test stress conditions and fire effect criteria shall be specified by the product specifications. 4.7.11 Packaging test
Packaging test shall be carried out in accordance with the provisions of Chapter 5 of GJB367.5. 4.8 Defect classification
According to the provisions of Article 3.10 of GJB179A, defects are divided into three categories: fatal defects, serious defects and minor defects. 4.8.1 Fatal defects
Defects that can cause the destruction of the machine or endanger the production safety of users and maintenance personnel. 4.8.2 Serious defects
a. Any performance characteristic listed in Article 3.10 is unqualified; b. Any functional characteristic specified in Article 3.2 cannot be realized. The indication system is abnormal and affects the work:
Failure of the alarm system:
Other serious defects specified in the product specifications. e.
4.8.3 Minor defects
Some parts of the housing are slightly dented;
The surface paint layer has small pieces falling off:
Some characters and codes of the brand name logo are unclear, but can be identified: c.
d. Other minor defects specified in the product specifications. 5 Delivery preparation
The packaging, transportation, storage and marking requirements of the transmitter shall comply with the provisions of Chapter 1 to Chapter 4 of GJB 367.5. 8
TKAorKAca
Notes
6.1 Intended use
SJ 20728—1999
The transmitter is intended for terrestrial low-frequency/base low-frequency communication. 6.2 Contents of order documents
The following contents shall be stated in the contract or order: a. The name and number of this specification;
b. Type;
C. Equipment model:
d. Quantity;
e. Other matters.
Additional remarks:
This specification is under the jurisdiction of China Electronics Technology Standardization Institute. This specification is drafted by China Electronics Technology Standardization Institute. The main drafters of this specification: Huang Shoubao, Zhu Wenqi, Yang Bin. Project code: B73007.Equipment model:
d. Quantity;
e. Other matters.
Additional remarks:
This specification is under the jurisdiction of China Electronics Standardization Institute. This specification is drafted by China Electronics Standardization Institute. The main drafters of this specification are: Huang Shoubao, Zhu Wenqi, Yang Bin. Project code: B73007.Equipment model:
d. Quantity;
e. Other matters.
Additional remarks:
This specification is under the jurisdiction of China Electronics Standardization Institute. This specification is drafted by China Electronics Standardization Institute. The main drafters of this specification are: Huang Shoubao, Zhu Wenqi, Yang Bin. Project code: B73007.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.