SJ 20732-1999 General specification for mobile communication RF power amplifier
Some standard content:
Military Standard for Electronic Industry of the People's Republic of China FL 5820
SJ20732—1999
General Specification for Radio Frequency Power Amplifier Mobile Communication Issued on 11-10-1999
Implemented on 12-01-1999
Approved by the Ministry of Information Industry of the People's Republic of China 1 Scope
Military Standard for Electronic Industry of the People's Republic of China General Specification for Radio Frequency Power Amplifier of Mobile Communication 1.1 Subject Content
SJ20732-1999
This specification specifies the requirements, quality assurance provisions, delivery preparation and instructions for radio frequency power amplifiers used in transmitting equipment in tactical communications.
1.2 Scope of Application
This specification applies to radio frequency power amplifiers used in transmitting equipment in tactical communications. The requirements of this specification should be followed when writing product specifications.
2 Referenced Documents
GJB151A-97 Requirements for electromagnetic emission and sensitivity of military equipment and subsystems Measurement of electromagnetic emission and sensitivity of military equipment and subsystems GJB152A-97
GJB 179A96
5 Counting Sampling Inspection Procedures and Tables
GJB 367.1-87
GJB367.2—87
GJB367.3—87
GJB367.5---87
General technical conditions for military communication equipment Design and manufacturing requirements General technical conditions for military communication equipment Environmental test methods General technical conditions for military communication equipment Reliability identification test and acceptance test methods General technical conditions for military communication equipment Packaging, transportation and storage requirements GJB368A—94
4 General outline for equipment maintainability
Safety requirements for military communication equipment and systems
GJB663-89
GJB2072--94 Maintainability test and assessment
3 Requirements
3.1 Qualification appraisal
Products submitted in accordance with this specification shall be products that have passed the appraisal or have been approved for finalization. 3.2 Design
According to the requirements of Chapter 1 of GJB367.1.
3.2.1 Composition
RF power amplifiers are generally composed of excitation, driving, final power amplifier and output filter, automatic power control, output protection circuit and other units. Adjustments can be made according to different power levels. 3.2.2 Functional characteristics
The Ministry of Information Industry of the People's Republic of China issued on November 10, 1999 and implemented on December 1, 1999
a. RF power amplification;
b. Automatic power control;
c. Output protection circuit.
3.3 Structure
SJ 20732-1999
Should meet the requirements of Article 1.15 of GJB367.1. Ensure that the equipment can adapt to the specified environmental requirements and is easy to operate, control and maintain. The detailed requirements of the structure are specified by the product specifications and should meet the requirements of relevant modularization. 3.4 Appearance quality
The outer surface of the equipment should be free of dents, bumps, cracks, deformation, etc.; the coating should not bubble, accumulate, crack or fall off, and the color should be coordinated; metal parts should not have rust and other mechanical damage; fastening parts should not be loose. 3.5 Dimensions
Specified by product specifications.
3.6 Weight
Specified by product specifications.
3.7 Marks and codes
The nameplate should have the product model and name, manufacturer, production date or batch number, and the main components, parts, test points, control switches, etc. should be marked. The power input and output terminals should indicate the positive and negative voltages and the corresponding values. 3.8 Components, parts and materials
The components, parts and materials used should comply with the requirements of Chapter 3 of GJB367.1. 3.9Maintainability
Maintainability design shall comply with the requirements of Article 1.6 of GJB367.1 and GJB368A. The mean time to repair (MTTR) shall not exceed 15 minutes.
3.10Safety
It shall comply with the requirements of Article 1.8 of GJB367.1 and GJB663. 3.11Interchangeability
It shall comply with the requirements of Article 1.7 of GJB367.1. After replacing the module with the same function, the performance index of the amplifier shall meet the requirements of the product specification.
3.12Performance characteristics
There are shortwave single sideband radios and ultra-shortwave FM radios in tactical communication systems. The RF power amplifiers used in their transmitters are also divided into linear RF power amplifiers and nonlinear RF power amplifiers, and their electrical performance requirements are also different.
3.12.1Linear RF power amplifier
The electrical performance requirements of linear RF power amplifiers shall comply with the provisions of Table 1. - 2 -
Frequency range MHz
Frequency band characteristics dB
Average output power W
Peak envelope output power 1) W
Harmonic RF component dB
Third-order intermodulation component dB
Input power W
Input and output impedance 2
Efficiency %
Automatic power control dB
Power start-up time
Supply voltage V (dc)
SJ 20732-1999
Indicator requirements
Specified by product specificationswww.bzxz.net
5, 15, 35
5, 20
≤-40
≤-25
Specified by product specifications
Specified by product specifications
Specified by product specifications
12, 24 Negative grounding
Note: 1) Peak envelope output power is the preferred power level. 3.12.2 Non-linear RF power amplifier
75，140
50，100，200
≤-45
≤-30
The electrical performance requirements of the non-linear RF power amplifier shall comply with the requirements of Table 2. Table 2
Frequency range MHz
Frequency band characteristics dB
Output power 1) W
Input power W
Harmonic RF components
Input and output impedance 2
Automatic power control dB
Efficiency %
Power start-up time
Input power||t t||Power supply voltage V (dc)
Indicator requirements
30～88, 88~100, 400~600, 600~1000Specified by product specifications
5, 10, 25, 50, 100
Specified by product specifications
≤-2.5μW (output power less than 25W)≤-70dB (output power greater than or equal to 25W)50
Specified by product specifications
Specified by product specifications
Specified by product specifications
12, 24Negative grounding
Note: 1) The output power is the preferred power level. 3.13 Stability
The stability of the RF power amplifier shall meet the following requirements: a. The power amplifier load does not self-excite when VSWR≤3: b. When there is no input signal and the power is on, the input and output terminals are short-circuited or open-circuited at the same time, and when one terminal is short-circuited and the other terminal is open-circuited, there is no self-excitation and no damage: c. When there is automatic gain control, the input signal increases by 3dB, and the operation remains stable without white excitation. 3.14 Environmental adaptability
3.14.1 Temperature
3.14.1.1 Low temperature
Working temperature: -25℃, -40℃:
Storage temperature: -50℃, -55°℃.
3.14.1.2 High temperature
Working temperature: 55℃;
Storage temperature: 65℃, 70℃.
3.14.1.3 Extreme ambient temperature operation requirements At the extreme operating temperature, the power output is allowed to drop by no more than 1dB. 3.14.2 Impact
According to GJB367.2 "408 Impact Test" Table 408-1 basic design test, the pulse waveform is a half-sine wave pulse, and the five surfaces (except the pin surface) are impacted 3 times each, for a total of 15 times. The final inspection should meet the requirements of 3.12.1 or 3.12.2. 3.14.3 Sinusoidal vibration
According to GJB367.2 According to the corresponding curve of Table 409-1 of "409 Vibration Test", the three mutually perpendicular axes shall vibrate for 30 minutes each. After vibration, the fixed parts shall not be loose or shifted, and the movable parts shall not be stuck. The final inspection shall meet the requirements of 3.12.1 or 3.12.2. 3.14.4 Damp Heat
According to the requirements of Method 1 of GJB367.2 "411 Damp Heat Test", the final inspection shall meet the requirements of 3.12.1 or 3.12.2.
3.14.5 Mold
According to the requirements of GJB367.2 "412 Mold Test", the mold growth or corrosion after the test shall not be greater than Level 2; the electrical performance after recovery shall meet the requirements of 3.12.1 or 3.12.2. 3.14.6 Salt spray
According to the requirements of salt spray method 1 of GJB367.2 "413 Salt Spray Test", after the test, the surface parts of the shell should not have obvious blistering, pits or visible damage caused by loose metal surface coating and surface degradation and corrosion. Finally, the electrical performance is checked to meet the requirements of 3.12.1 or 3.12.2. 3.15 Continuous working time
Within the temperature and voltage range specified in this specification, it should be able to work continuously for 168 hours at a ratio of 3 minutes of work and 9 minutes of stop. After continuous work, its electrical performance should meet the requirements of 3.12. 3.16 Power supply
When the power supply voltage deviates from +20%, -15%, it should work normally, and at -15%, the power drop shall not exceed 1dB. 3.17 Electromagnetic compatibility
It should meet the requirements specified in GJB151A.
3.18 Reliability
Should comply with the provisions of Article 1.3.1 of GJB367.1. The mean time between failures (MTBF) (6,) shall be specified by the product specification.
4 Quality Assurance Provisions
4.1 Inspection Responsibility
SJ20732-1999
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 products must comply with all requirements of Chapters 3 and 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 inspection requirements not 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 Inspection conditions
4.3.1 Unless otherwise specified, all inspections specified in this specification shall be carried out under the following normal test atmospheric conditions:a. Temperature: 15℃~35℃;
b. Relative humidity: 20%~80%:
c. Air pressure: test site air pressure.
4.3.2 Unless otherwise specified, during the inspection, the power supply voltage shall be within the range of ±2% of the rated value, and the source frequency shall be within the range of ±2% of the rated value.
4.3.3 The tester used shall have sufficient accuracy and stability, and the accuracy shall be one order of magnitude or one third higher than the accuracy of the measured indicator.
4.3.4 The test instrument used shall be qualified for measurement and within the validity period. 4.4 Qualification inspection
Qualification inspection is generally carried out when the equipment is designed and finalized for production. However, when there are major changes in the main design, process, components and materials of the equipment, which affect the important performance of the equipment and make the original qualification conclusion no longer valid, qualification inspection should also be carried out.
Qualification inspection should be carried out in a laboratory or place (site) approved by the ordering party or the superior qualification agency. 4.4.1 Number of samples
The number of samples for qualification inspection should generally not be less than 3 units, or as specified by the product specifications. 4.4.2 Inspection items
The qualification inspection items are shown in Table 3.
4.4.3 Qualification criteria
When all inspection items meet the requirements of Chapter 3 and Chapter 5, the qualification inspection is judged to be qualified. If any inspection item does not meet the specified requirements, the inspection should be suspended. The contractor should 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. If all inspection items meet the specified requirements, the appraisal inspection is still judged to be qualified; if there is still an item that does not meet the specified requirements after continued inspection, it is judged to be unqualified. 4.4.4 Maintenance of qualified appraisal qualifications
SJ20732-1999
In order to maintain the qualified appraisal inspection qualifications, the contractor should provide product test data or qualified certification data every year (quarter or month) according to the requirements of the ordering party or the superior appraisal agency. 4.5 Quality consistency inspection
4.5.1 Inspection grouping
Quality consistency inspection is divided into groups A, B, C, and D. 4.5.2 Formation of inspection batches
The formation of inspection batches shall comply with the provisions of Article 5.4.6 of GJB179A. 4.5.3 Inspection items
The inspection items are shown in Table 3.
Inspection items
Structure and dimensions
Appearance quality
Marking and code
Components, parts and materials
Maintainability
Safety
Interchangeability
Performance characteristics
Frequency band characteristics
Average output power
Peak envelope output power
Output power
Harmonic RF components
Stability
Third-order intermodulation
Power start-up time
Environmental requirements
Sinusoidal vibration
Quality consistency inspection
Required||tt| |Chapter No.
Table 1 in 3.12
Table 1 in 3.12
Table 2 in 3.12
Test Method
Chapter No.
Inspection Items
Continuous Working Time
Electromagnetic Compatibility
Reliability
?Packaging Inspection
SJ20732-1999
Continued Table 3
Quality Consistency Inspection
Required by Product Specifications
Chapter No.
Note: "○" indicates items to be inspected; "△" indicates optional items; "-" indicates items not to be inspected. 4.5.4 Group A Inspection
4.5.4.1 Sampling Plan
100% of the inspection batches submitted by the contractor shall be subject to Group A inspection. The batch quality (expressed as the number of defects per 100 units) is specified by the product specification or contract. The defect classification is specified by the product specification.
4.5.4.2 Qualification criteria
The whole batch is evaluated by inspection and elimination of defective products. Test method
Chapter number
According to the test 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 test. Fatal defects are not allowed in the Group A test. Once fatal defects are found, the batch is rejected. 4.5.4.3 Re-inspection
For batches that fail the Group A test, the contractor shall analyze the batch of products, find out the cause of the defects and take corrective measures, and then resubmit for inspection. The resubmitted batch shall be separated from the new batch and marked as "resubmitted batch". If the re-inspection is qualified, the batch is still judged to have passed the Group A test: if the re-inspection is still unqualified, the batch is judged to have failed the Group A test.
4.5.4.4 Sample processing
If defective products are found in the batch that has passed the Group A inspection, the contractor shall be responsible for repairing them and the whole batch can be delivered after they meet the requirements specified in the product specifications. 4.5.5 Group B inspection
Group B inspection shall be carried out on the products in the Group A inspection batch. 4.5.5.1 Sampling plan
a. Continuous batches
Group B sampling inspection shall be carried out in accordance with the relevant provisions of GJB179A, using a normal inspection sampling plan of general inspection level II, and the acceptable quality level (AQL) shall be selected from Table 4. The defect classification is specified by the product specification.
Defect classification
Serious defects
Minor defects
b. Isolated batch
SJ20732-1999
Acceptable quality level (AQL)
Select from Table 6-B (P=10%) of GJB179A according to the inspection level and acceptable quality level of the product batch and continuous batch.
4.5.5.2 Qualification criterion
According to the inspection results, if the number of defects found is not greater than the qualified judgment number, the batch B group inspection is judged to be qualified, otherwise the batch B group inspection is judged to be unqualified.
4.5.5.3 Re-inspection
For batches that fail the Group B inspection, the contractor shall analyze the batch of products, find out the causes of defects and take corrective measures before resubmitting them for inspection. During re-inspection, the resubmitted batch shall be separated from the new batch and marked with "resubmitted batch", and stricter inspection shall be adopted in accordance with Article 5.2 of GJB179A. If the re-inspection is qualified, the batch is still judged to have passed the Group B inspection; if the re-inspection is unqualified, the batch is judged to have failed the Group B inspection.
4.5.5.4 Sample processing
If defective products are found in the batch that passes the Group B inspection, the contractor shall be responsible for repairing them and the whole batch can be delivered after they meet the requirements specified in the product specifications. 4.5.6 Group C inspection
Group C inspection shall be carried out on products from the batches that pass the Group A and Group B inspections. 4.5.6.1 Sampling plan
The sampling inspection of group C shall be carried out in accordance with the relevant provisions of GJB179A, and the normal inspection sampling plan of special inspection level S-2 shall be adopted. The acceptable quality level (AQL) shall be selected from Table 6. The defect classification shall be specified by the product specification.
Defect classification
Serious defect
Minor defect
4.5.6.2 Qualification determination
Acceptable quality level (AQL)
101525
According to the inspection results, if the number of defects found is not greater than the qualified determination number, the group C inspection of the batch shall be determined to be qualified, otherwise the group C inspection of the batch shall be determined to be unqualified.
4.5.6.3 Re-inspection
If the sample fails the group C inspection, the acceptance and delivery of the product shall be stopped. The contractor shall notify the superior appraisal agency of the unqualified situation. After finding out the cause and taking corrective measures, all tests or inspections shall be re-performed, or only the unqualified items shall be tested or inspected, according to the opinions of the ordering party or the superior appraisal agency. When re-inspecting, a stricter inspection shall be adopted.
If the re-inspection is qualified, the C group inspection is judged to be qualified; if the re-inspection is still unqualified, the unqualified situation shall be reported to the superior appraisal agency.
4.5.6.4 Sample processing
SJ 20732-1999
Unless otherwise specified, samples that have passed the C group inspection can be delivered according to the contract or order after the contractor repairs the discovered or potential damage and passes the A and B group inspections. 4.5.6.5 Inspection cycle
a. When the product is in normal continuous batch production, it is generally conducted once a year: b. Each submitted batch of isolated batches of products;
c. When the product is officially produced, if there are major changes in structure, materials, processes, etc., which may affect product performance: d. When the superior quality supervision agency makes a request. 4.5.7 Group D inspection
Group D inspection should be carried out on products that have passed the inspection of Group A and Group B. 4.5.7.1 Sampling plan
Group D inspection samples should be randomly selected from samples of the inspection of Group A and Group B. The number of samples is specified by the product specification.
4.5.7.2 Unqualified
If the sample fails the Group D inspection, the acceptance and delivery of the product should be stopped. The contractor should notify the superior appraisal agency of the unqualified situation. After taking corrective measures, according to the opinions of the superior appraisal agency, all tests or inspections should be carried out again, or only the unqualified items should be tested or inspected. If the test is still unqualified, the unqualified situation should be notified to the superior appraisal agency.
4.5.7.3 Sample handling
Unless otherwise specified, for samples that have passed the D group inspection, the contractor shall be responsible for repairing and replacing parts that have exceeded half of their life span and parts that are damaged during the test, and after passing the A and B group inspections again, they can be delivered in batches according to the contract or order.
4.5.7.4 Inspection cycle
D group inspection is carried out once a year for continuous batch production. When the batch is small, it can also be carried out according to the requirements of the ordering party. When the main design, process, key components and raw materials of the product are changed and have a significant impact on the product performance, D group inspection should also be carried out.
4.6 Packaging inspection
Packaging inspection shall be carried out in accordance with the relevant provisions of Chapter 6 of GJB367.5. 4.7 Inspection method
Unless otherwise specified, all test conditions of this specification shall comply with the provisions of Article 4.3. 4.7.1 Design
Inspect and review according to the design documents.
4.7.2 Structure
According to the design documents, use measuring tools to measure or use visual inspection to check. 4.7.3 Appearance quality
Use visual inspection to check the quality of the product
4.7.4 Dimensions
Use measuring tools to measure.
4.7.5 Weight
SJ20732-—1999
According to the design documents, use weighing instruments to measure to identify the requirements of the product. 4.7.6 Markings and codes
Use visual inspection to check.
4.7.7 Components, parts and materials
Inspect according to the design documents and the specified requirements. 4.7.8 Maintainability
Carry out according to the relevant methods in GJB2072.
4.7.9 Safety
Inspect in accordance with Article 1.8 of GJB367.1 and the requirements of GJB663. The specific method shall be specified by the product specification. 4.7.10 Interchangeability
After replacing components with the same function, the main performance items shall be measured and shall meet the requirements. 4.7.11 Performance characteristics
4.7.11.1 Output power, frequency and frequency band characteristicsa. Connect the test equipment according to Figure 1;
b. Input the RF signal level to the RF power amplifier;c. In a time much longer than the modulated audio signal cycle, record the power indicated by the power meter, which is the output power, and for linear power amplifiers, it is the average output power;d. Observe and record the frequency indicated by the frequency meter, which is the operating frequency of the power amplifier;e. Change the frequency of the input RF signal, repeat steps bc, and record the power at different frequencies. The decibel difference between the maximum and minimum output power is the frequency band characteristic. 2
1RF signal generator; 2-Power amplifier under test; 3-Power meter: 4-Coupler: 5-Frequency meter Figure 1
4.7.11.2 Peak envelope power
Peak envelope power refers to the average power fed to the specified load in one high frequency cycle at the peak of the modulation envelope during single-sideband modulation. Its value can only be obtained from Table 7 according to different emission categories and modulation signals by multiplying its average power according to the corresponding conversion factor.5 Inspection cycle
a. When the product is in normal continuous batch production, it is generally conducted once a year: b. Each submitted batch of isolated batch products;
c. When the product is officially produced, if there are major changes in structure, materials, processes, etc., which may affect product performance: d. When the superior quality supervision agency makes a request. 4.5.7 Group D inspection
Group D inspection should be conducted on products that have passed the inspection of Group A and Group B. 4.5.7.1 Sampling plan
Group D inspection samples should be randomly selected from samples of the inspection of Group A and Group B. The number of samples is specified by the product specification.
4.5.7.2 Unqualified
If the sample fails the Group D inspection, the acceptance and delivery of the product should be stopped. The contractor should notify the superior appraisal agency of the unqualified situation. After taking corrective measures, according to the opinions of the superior appraisal agency, all tests or inspections should be carried out again, or only the unqualified items should be tested or inspected. If the test still fails, the superior appraisal agency shall be notified of the failure.
4.5.7.3 Sample handling
Unless otherwise specified, for samples that have passed the Group D inspection, the contractor shall be responsible for repairing and replacing parts that have exceeded half of their life span and are indeed damaged during the test, and after passing the Group A and Group B inspections again, they can be delivered in batches according to the contract or order.
4.5.7.4 Inspection cycle
Group D inspection is carried out once a year for continuous batch production. When the batch is small, it can also be carried out according to the requirements of the ordering party. When the main design, process, key components and raw materials of the product are changed and have a significant impact on the product performance, Group D inspection should also be carried out.
4.6 Packaging inspection
Packaging inspection shall be carried out in accordance with the relevant provisions of Chapter 6 of GJB367.5. 4.7 Inspection method
Unless otherwise specified, all test conditions of this specification shall comply with the provisions of Article 4.3. 4.7.1 Design
Inspect and review according to the design documents.
4.7.2 Structure
Inspect by measuring or visual inspection according to the design documents. 4.7.3 Appearance quality
Inspect the quality of the product by visual inspection
4.7.4 Dimensions
Measure with measuring tools.
4.7.5 Weight
SJ20732-—1999
Inspect by measuring with weighing instruments according to the design documents to identify the requirements of the product. 4.7.6 Markings and codes
Inspect by visual inspection.
4.7.7 Components, parts and materials
Inspect according to the design documents and the specified requirements. 4.7.8 Maintainability
Carry out according to the relevant methods in GJB2072.
4.7.9 Safety
Inspect in accordance with Article 1.8 of GJB367.1 and the requirements of GJB663. The specific method shall be specified by the product specification. 4.7.10 Interchangeability
After replacing components with the same function, the main performance items shall be measured and shall meet the requirements. 4.7.11 Performance characteristics
4.7.11.1 Output power, frequency and frequency band characteristicsa. Connect the test equipment according to Figure 1;
b. Input the RF signal level to the RF power amplifier;c. In a time much longer than the modulated audio signal cycle, record the power indicated by the power meter, which is the output power, and for linear power amplifiers, it is the average output power;d. Observe and record the frequency indicated by the frequency meter, which is the operating frequency of the power amplifier;e. Change the frequency of the input RF signal, repeat steps bc, and record the power at different frequencies. The decibel difference between the maximum and minimum output power is the frequency band characteristic. 2
1RF signal generator; 2-Power amplifier under test; 3-Power meter: 4-Coupler: 5-Frequency meter Figure 1
4.7.11.2 Peak envelope power
Peak envelope power refers to the average power fed to the specified load in one high frequency cycle at the peak of the modulation envelope during single-sideband modulation. Its value can only be obtained from Table 7 according to different emission categories and modulation signals by multiplying its average power according to the corresponding conversion factor.5 Inspection cycle
a. When the product is in normal continuous batch production, it is generally conducted once a year: b. Each submitted batch of isolated batch products;
c. When the product is officially produced, if there are major changes in structure, materials, processes, etc., which may affect product performance: d. When the superior quality supervision agency makes a request. 4.5.7 Group D inspection
Group D inspection should be conducted on products that have passed the inspection of Group A and Group B. 4.5.7.1 Sampling plan
Group D inspection samples should be randomly selected from samples of the inspection of Group A and Group B. The number of samples is specified by the product specification.
4.5.7.2 Unqualified
If the sample fails the Group D inspection, the acceptance and delivery of the product should be stopped. The contractor should notify the superior appraisal agency of the unqualified situation. After taking corrective measures, according to the opinions of the superior appraisal agency, all tests or inspections should be carried out again, or only the unqualified items should be tested or inspected. If the test still fails, the superior appraisal agency shall be notified of the failure.
4.5.7.3 Sample handling
Unless otherwise specified, for samples that have passed the Group D inspection, the contractor shall be responsible for repairing and replacing parts that have exceeded half of their life span and are indeed damaged during the test, and after passing the Group A and Group B inspections again, they can be delivered in batches according to the contract or order.
4.5.7.4 Inspection cycle
Group D inspection is carried out once a year for continuous batch production. When the batch is small, it can also be carried out according to the requirements of the ordering party. When the main design, process, key components and raw materials of the product are changed and have a significant impact on the product performance, Group D inspection should also be carried out.
4.6 Packaging inspection
Packaging inspection shall be carried out in accordance with the relevant provisions of Chapter 6 of GJB367.5. 4.7 Inspection method
Unless otherwise specified, all test conditions of this specification shall comply with the provisions of Article 4.3. 4.7.1 Design
Inspect and review according to the design documents.
4.7.2 Structure
Inspect by measuring or visual inspection according to the design documents. 4.7.3 Appearance quality
Inspect the quality of the product by visual inspection
4.7.4 Dimensions
Measure with measuring tools.
4.7.5 Weight
SJ20732-—1999
Inspect by measuring with weighing instruments according to the design documents to identify the requirements of the product. 4.7.6 Markings and codes
Inspect by visual inspection.
4.7.7 Components, parts and materials
Inspect according to the design documents and the specified requirements. 4.7.8 Maintainability
Carry out according to the relevant methods in GJB2072.
4.7.9 Safety
Inspect in accordance with Article 1.8 of GJB367.1 and the requirements of GJB663. The specific method shall be specified by the product specification. 4.7.10 Interchangeability
After replacing components with the same function, the main performance items shall be measured and shall meet the requirements. 4.7.11 Performance characteristics
4.7.11.1 Output power, frequency and frequency band characteristicsa. Connect the test equipment according to Figure 1;
b. Input the RF signal level to the RF power amplifier;c. In a time much longer than the modulated audio signal cycle, record the power indicated by the power meter, which is the output power, and for linear power amplifiers, it is the average output power;d. Observe and record the frequency indicated by the frequency meter, which is the operating frequency of the power amplifier;e. Change the frequency of the input RF signal, repeat steps bc, and record the power at different frequencies. The decibel difference between the maximum and minimum output power is the frequency band characteristic. 2
1RF signal generator; 2-Power amplifier under test; 3-Power meter: 4-Coupler: 5-Frequency meter Figure 1
4.7.11.2 Peak envelope power
Peak envelope power refers to the average power fed to the specified load in one high frequency cycle at the peak of the modulation envelope during single-sideband modulation. Its value can only be obtained from Table 7 according to different emission categories and modulation signals by multiplying its average power according to the corresponding conversion factor.
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