SJ 20797-2001 General specification for shortwave reconnaissance and analysis receivers
Some standard content:
Military standard for the electronics industry of the People's Republic of China FL5865
SJ20797-2001
General specification for shortwave reconnaissance and analysis receivers2001-12-27 Issued
2002-01-01 Implementation
Approved by the Ministry of Information Industry of the People's Republic of China1 Scope
1.1 Subject matter.
1.2 Scope of application.
2 Reference documents
3 Requirements
3.1 Qualification
3.2 Components, parts and materials
3.3 Design,
Maintainability
Interchangeability
Performance characteristics
Safety.
Environmental requirements
Power consumption
3.10 Electromagnetic compatibility
Dimensions and weight
Color and surface condition
3.13 Marking
3.14 Appearance quality
Continuous working time,
3.16 Reliability
4 Quality assurance regulations
Inspection responsibility.
Inspection classification,
4.3 Inspection conditions.
Identification inspection
Quality consistency inspection
Packaging inspection
Inspection method
Defect classification
5 Delivery preparation.
6 Instructions,
Intended use
6.2 Contents of ordering documents
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1 Scope
General specification for short wave reconnaissance and analysis receivers, military standard of the electronics industry of the People's Republic of China
General specification for short wave reconnaissance and analysis receivers1.1 Subject content
SJ20797--2001
This specification specifies the requirements, quality assurance provisions, delivery preparation and instructions for short wave reconnaissance and analysis receivers (hereinafter referred to as receivers).
1.2 Scope of application
This specification applies to shortwave reconnaissance and analysis receivers used on the ground. 2 Referenced documents
GB/T6934-1995 Measurement methods for electrical performance of shortwave single-sideband receivers GJB151A-97 Requirements for electromagnetic emission and sensitivity of military equipment and subsystems GJB152A—97 Measurement methods for electromagnetic emission and sensitivity of military equipment and subsystems GJB179A—96 Counting sampling inspection procedures and tables General technical conditions for military communication equipment Design and manufacturing requirements GJB367.1—87
General technical conditions for military communication equipment Environmental test requirements GJB367.2—873
General technical conditions for military communication equipment Reliability identification test and acceptance test methods GJB367.3—872
GJB367.587 General technical conditions for military communication equipment Packaging, transportation and storage requirements GJB368A94 General outline for equipment maintainability
GJB2072—94
Maintainability test and assessment
Safety requirements for short-wave single-sideband communication equipment
SJ20044-92
3 Requirements
3.1 Qualification
Products submitted in accordance with this specification should be products that have been qualified or approved for finalization. 3.2 Components, parts and materials
The selection of components, parts and materials shall comply with the relevant provisions of Chapter 3 of GJB367.1. 3.3 Design
The design of the receiver shall comply with the relevant provisions of Chapter 1 of GJB367.1. 3.3.1 Functional characteristics
3.3.1.1 Types of receiver operation: manual or automatic constant amplitude alarm (A1A or A1B), manual amplitude modulation alarm (A2A), amplitude modulation speech (A3E), Ministry of Information Industry of the People's Republic of China 2001-12-27 Issued 2002-01-01 Implementation
SJ20797-2001
Single sideband speech (J3E), independent sideband speech (B3E), frequency modulation speech (F3E). 3.3.1.2 Receiver radio frequency Frequency preset and selection methods are: a. Digital keyboard input;
b. Who continuous modulation input:
c. Direct call storage channel:
d Automatic search for preset channels.
3.3.1.3 The frequency interval of the receiver is specified by the product specification. 3.3.1.4 The receiver has the ability to store working status and working parameters, including: working frequency (or upper and lower limit working frequency of the frequency band), working type, passband width, gain control mode, antenna attenuation, threshold level, dwell time, gain control amount, etc. It can also set the protection band and protection frequency. The number of stored frequencies and bands is specified by the product specification. 3.3.1.5 The receiver has two working modes: local and remote control. The remote control interface of the receiver is specified by the product specification. 3.3.1.6 The receiver can identify the modulation mode, which includes: AIA or A1B, A2A, A3E, J3E, F3E. 3.3.1.7 The receiver has the function of automatically measuring the signal frequency and level. 3.3.1.8 The receiver has the function of self-detection of faults. 3.4 Maintainability
The qualitative requirements for the maintainability of the receiver shall comply with the provisions of Article 4.5 of GJB368A, and the average repair time MTTR shall not exceed 15min.
3.5 Interchangeability
The interchangeability of the receiver shall comply with the requirements of Article 1.7 of GJB367.1. After replacing the same components, assemblies, parts and modules, the receiver shall be able to work normally without adjustment; after slight adjustment, it shall be able to meet the performance characteristics requirements; after interchanging the unit modules, the performance characteristics of the receiver shall meet the requirements. 3.6 Performance Characteristics
3.6.1 Frequency Error (see Article 4.7.6.1) The frequency error of the receiver: 1×10-7.
3.6.2 Frequency Stability (see Article 4.7.6.2) The frequency stability of the receiver: 5×10-8/d. 3.6.3 Reference sensitivity (see 4.7.6.3) When the receiver is in J3E, A1A or AIB working type, the reference sensitivity is 2μV: When the receiver is in A3E working type, the reference sensitivity is 6μV: When the receiver is in F3E working type, the reference sensitivity is 3μV. 3.6.4 Intermediate frequency selectivity (see 4.7.6.4) The ratio of the intermediate frequency 60dB bandwidth to the 6dB bandwidth of the receiver is 4. 3.6.5 Total distortion coefficient (see 4.7.6.5) The total distortion coefficient of the receiver is 5%.
3.6.6 Relative audio intermodulation (see 4.7.6.6) The relative audio intermodulation of the receiver is 40dB. 3.6.7 Out-of-band intermodulation (see 4.7.6.7) The out-of-band intermodulation of the receiver is 80dBμV.
3.6.8 Blocking (see 4.7.6.8)
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Blocking level of the receiver: 100dBμV
3.6.9 Reciprocal mixing (see 4.7.6.9) Reciprocal mixing of the receiver: 80dBuV.
3.6.10 Intermediate frequency suppression ratio (see 4.7.6.10) Intermediate frequency suppression ratio of the receiver: 80dB.
3.6.11 Image frequency suppression ratio (see 4.7.6.11) SJ20797—2001
The first image frequency suppression ratio of the receiver: 86dB: The second image frequency suppression ratio: 76dB. 3.6.12 Spurious frequency suppression ratio (see 4.7.6.12) The spurious frequency suppression ratio of the receiver: 60dB. 3.6.13 Combined tone (see 4.7.6.13) The frequency points where the receiver is 6dB greater than the noise level shall not exceed 6. 3.6.14 Automatic gain control characteristics (see 4.7.6.14) When the receiver input changes by 80dB, the output changes by no less than 6dB. 3.6.15 RF gain control (see 4.7.6.15) The RF gain control amount of the receiver: 80dB. 3.6.16 Conducted spurious components at the antenna end (see 4.7.6.16) The conducted spurious components at the antenna end of the receiver (reverse radiation level) shall not exceed 20μV for frequencies below 30MHz and not exceed 50μV for frequencies above 30MHz.
3.6.17 Frequency measurement accuracy (see 4.7.6.17) a: When the modulation mode of the signal is F3E, the frequency measurement accuracy of the receiver: ±1kHz; b.When the modulation pattern of the signal is A2A, A3E, J3E, the frequency measurement accuracy of the receiver is: ±100Hz; C. When the modulation pattern of the signal is AIA, AIB, the frequency measurement accuracy of the receiver is: +30Hz. 3.6.18 Level measurement accuracy (see 4.7.6.18) The level measurement accuracy of the receiver is: ±5dB. 3.6.19 Frequency switching time (see 4.7.6.19) The frequency switching time of the receiver is: 10ms.
3.6.20 Frequency range (see 4.7.6.20) The frequency range of the receiver is: 1.5～30MHz. 3.7 Safety
The safety requirements of the receiver shall comply with the provisions of SJ20044. 3.8 Environmental requirements
3.8.1 Temperature
Working temperature: -10°C~55°C;
Storage temperature: -40°C~65°C.
3.8.2 Shock
The receiver should be able to withstand the basic design test specified in Table 408-1 of "408 Shock Test" in GJB367.2. 3.8.3 Vibration
The receiver should be able to withstand the vibration test specified in Curve V of "409 Vibration Test" in GJB367.2. 3.8.4 Damp Heat
SJ 20797-2001
The receiver should be able to withstand the damp heat test specified in Chapter 3 of "411 Damp Heat Test" in GJB367.2. 3.9, Power consumption
AC power supply: (220+10%)V, (50±2)Hz, power consumption is specified by product specifications. 3.10 Electromagnetic compatibility
The electromagnetic compatibility of the receiver shall comply with the requirements specified in GJB151A, and the specific test items shall be specified in product specifications. 3.11 Dimensions and weight
The dimensions and weight of the receiver shall be specified in product specifications. 3.12 Color and surface condition
The color, surface processing and plating of the receiver shall comply with the provisions of Articles 1.20, 2.5 and 2.6 of GJB367.1. 3.13 Marking
The receiver marking shall comply with the provisions of Article 1.21 of GJB367.1. 3.14 Appearance quality
The receiver surface should be free of rust, stains, coating peeling, scratches, burrs; plastic parts should be free of blistering, cracking, deformation; text, symbols, and signs should be clear; structural parts and control components should be complete and free of mechanical damage. 3.15 Continuous working time
The continuous working time of the receiver shall not be less than 24h. 3.16 Loadability
The mean time between failures MTBF (6) of the receiver shall not be less than 1000h. 4 Quality assurance provisions
4.1 Inspection responsibility
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 signing agency has the right to inspect any inspection item described in the specification. 4.1.1 Qualification responsibility
All products must meet 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 outline. 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 classificationwww.bzxz.net
The inspections specified in this specification are divided into:
a. Identification inspection;
b. Quality consistency inspection.
4.3 Inspection conditions
Unless otherwise specified, various inspections shall be carried out in accordance with Article 2.1.1 of GJB367.2. 4.4 Identification inspection
Identification inspection is generally carried out when the product design is finalized and production is finalized. When there are major changes in the main design, process, components and materials of the product that affect the important performance of the product and make the original identification results no longer valid, identification inspection shall also be carried out. Identification inspection shall be carried out in a laboratory approved by the ordering party or the superior identification agency. 4.4.1 Inspection items
See Table 1 for identification inspection items.
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Inspection or test items
Components,
Parts and materials
Interchangeability
Frequency error
Frequency stability
Benchmark sensitivity
IF selectivity
Total distortion coefficient
Relative audio intermodulation
Out-of-band intermodulation
Cold blocking
Reciprocal mixing
IF suppression ratio
Image frequency suppression ratio
Spurious frequency suppression ratio
Combined tone
Dynamic gain control characteristics
RF gain control
Conducted spurious components at the antenna end
Frequency measurement accuracy
Level measurement accuracy
Frequency switching time||tt| |Frequency range
Safety
Power consumption
Electromagnetic compatibility
Dimension and weight
Color and surface condition
Appearance Quality disk
SJ20797—2001
Required
Chapter number
Inspection or test
Chapter number of method
Quality disk consistency inspection
Inspection or test items
Continuous working time
Reliability
SJ20797—2001
Continued Table 1
Required
Chapter number
Inspection or test
Chapter number of method
Note: "O" in the table means required items; "" means optional items; "" means no items. Inspection samples
Conformity inspection
Quality 1
The identification inspection samples must be products that have passed the inspection of the quality inspection department of the contractor and have complete inspection records. The number of samples is generally 2 sets.
4.4.3 Qualification criteria
When all inspection items meet the requirements of Chapter 3 and Chapter 5, the identification inspection is considered to be qualified. If any inspection item does not meet the requirements specified in Chapter 3 and Chapter 5 due to poor design or workmanship, the inspection should be suspended. The contractor should analyze the unqualified items, find out the causes of the defects and take corrective measures. The unqualified items and related items can be inspected again. If all inspection items meet the specified requirements, the identification inspection is still considered to be qualified; if there is still an item that does not meet the specified requirements after the continued inspection, the identification inspection is considered to be unqualified.
4.4.4 Maintenance of identification qualification
In order to maintain the identification inspection qualification, the contractor should provide product test data regularly according to the requirements of the superior identification agency. 4.5 Quality consistency inspection
4.5.1 Inspection grouping
Quality consistency inspection is divided into Group A, Group B, Group C and Group D inspection. 4.5.2 Form 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
One hundred percent of the inspection batch products submitted by the contractor shall be subject to Group A inspection. The batch quality of Group A inspection is expressed by the number of defects per hundred units of products. The acceptable number of defects per hundred units of products shall be agreed upon by the contractor and the ordering party or selected from the following values: Number of serious defects: 10, 15, 25:
Number of minor defects: 40, 65, 100.
The specific acceptable number of defects per 100 units of products shall be specified in the product specification or contract. 4.5.3.3 Defect classification
For defect classification, see 4.8.
4.5.3.4 Acceptance criteria
Based on the inspection results, calculate the number of defects per 100 units of products. If it is equal to or less than the specified acceptable value, the batch of Group A inspection is considered to be qualified. Otherwise, the batch of Group A inspection is considered to be unqualified. 6
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4.5.4 Group B inspection
4.5.4.1 Inspection items
The inspection items of Group B are shown in Table 1.
4.5.4.2 Sampling plan
SJ20797—2001
Samples for Group B inspection shall be randomly selected from qualified batches that have passed Group A inspection. The sampling inspection of Group B is carried out in accordance with the relevant provisions of GJB179A, and a normal sampling plan with special inspection level S-3 is adopted. The acceptable quality level (AQL) of the continuous batch is selected from the following values:
Severe defect AQL: 4.0, 10, 15;
Minor defect AQL: 25, 40, 65;
The specific value of AQL is specified by the product specification or contract. The corresponding limit quality (LQ) value of the isolated batch shall be specified in the contract in accordance with Article 5.5 of GJB179A. 4.5.4.3 Qualification Criteria
According to the test results, if fatal defects are found in the samples, the batch of products will be judged to be unqualified in the Group B test: If the number of defects in the samples is not greater than the qualified judgment number, the batch of products will be judged to be qualified in the Group B test: Otherwise, the batch of products will be judged to be unqualified in the Group B test. Fatal defects are not allowed in the Group B test. Once fatal defects are found, the batch will be judged to be unqualified. 4.5.4.4 Re-inspection
For batches that fail the Group B test, the contractor should analyze the batch of products, find out the cause of the defects and take corrective measures, and then resubmit for inspection. During re-inspection, the resubmitted batch should be separated from the new batch, and marked with "resubmitted batch", and stricter inspection should be adopted.
If the re-inspection is qualified, the batch of products will still be judged to be qualified in the Group B test; if the re-inspection is still unqualified, the batch of products will be judged to be unqualified in the Group B test. 4.5.5 Group A and Group B Inspection Sample Processing
For defective products in the batches that have passed the Group A and Group B inspections, the contractor shall be responsible for repairing them and meeting the requirements of the product specifications before they can be delivered in batches according to the contract or order. 4.5.6 Group C Inspection
4.5.6.1 Inspection Items
The inspection items of Group C are shown in Table 1.
4.5.6.2 Sampling Plan
The samples for Group C inspection shall be randomly selected from the qualified sample batches that have passed the Group A and Group B inspections. The sampling plan for Group C inspection is: when the batch is not more than 8 sets, select one set; when the batch is between 9 and 150 sets, select two sets; when the batch is more than 150 sets, select three sets.
4.5.6.3 Qualification Criteria
When conducting Group C inspection, if all inspection items meet the requirements of the product specifications, the Group C inspection is considered qualified. If any of the inspection items do not meet the requirements of the product specifications, the Group C inspection is judged to be unqualified. 4.5.6.4 Re-inspection
If the product fails the Group C inspection, the acceptance and delivery of the product should be stopped. The contractor should notify the ordering party or the superior appraisal agency of the unqualified situation. After finding out the cause and taking corrective measures, it can be resubmitted for inspection. The re-inspection should be carried out according to the opinions of the ordering party or the superior appraisal agency. All tests or inspections should be carried out, or only the unqualified items should be tested or inspected. If the re-inspection is qualified, the Group C inspection is judged to be qualified: if the re-inspection is still unqualified, the Group C inspection is judged to be unqualified. 7
SJ20797—2001
Unless otherwise specified, samples that have passed the Group C inspection can be delivered according to the contract or order after the contractor repairs the discovered or potential damage and passes the Group A and Group B inspections. 4.5.6.6 Inspection cycle
In any of the following situations, the submitted products shall be subject to Group C inspection: a: Isolated batch:
b. The first submitted batch of each production batch of a continuous batch and the subsequent submitted batch every 6 months: C. When there are major changes in the structure, materials, process, etc. of the product, which may affect the product performance. 4.5.7 Group D inspection
4.5.7.1 Inspection items
See Table 1 for the inspection items.
4.5.7.2 Sampling plan
The Group D inspection shall be randomly selected from the samples of the Group A and Group B inspection qualified batches, and the number of samples shall be specified by the product specifications. 4.5.7.3 Sample processing
Unless otherwise specified, the contractor shall be responsible for repairing and replacing the parts that have consumed all or most of the design service life of the samples that have passed the Group D inspection, and can be delivered according to the contract or order after passing the Group A and Group B inspections. 4.5.7.4 Inspection cycle
In any of the following situations, the submitted products shall be subject to Group D inspection: a. After the product is officially put into production, if there are changes in the design, process, materials and key components that affect the product quality; b. When the contract or order requires Group D inspection. 4.5.8 Non-conformity
If the sample fails the Group C or Group D inspection, the acceptance and delivery of the product shall be stopped. The contractor shall notify the superior appraisal agency of the non-conformity. After taking corrective measures, all tests or inspections shall be carried out again according to the opinions of the superior appraisal agency, or only the non-conforming items shall be tested or inspected. If the test is still unqualified, the non-conformity shall be notified to the qualified appraisal agency. 4.6 Packaging inspection
It shall be carried out in accordance with the relevant provisions of GJB367.5.
4.7 Inspection methods
4.7.1 General requirements
4.7.1.1 Test conditions
Unless otherwise specified, all inspections specified in this specification shall be carried out under the environmental conditions specified in Article 4.3 and the power supply conditions specified below:
AC power supply: (220±2%)V, (50±2%)Hz. 4.7.1.2 Measuring instruments and test equipment
The accuracy of the measuring instruments shall be able to meet the accuracy requirements of the measured performance indicators and be within the period of metrological verification. The test equipment shall be able to provide the conditions required for the test, and during the test, the test equipment shall maintain the specified accuracy. 4.7.2 General Inspection
The following aspects shall be measured or visually inspected using measuring tools in accordance with the product design drawings and documents: a. Components, parts and materials (see 3.2): b. Dimensions and weight (see 3.11):
C. Color and surface condition (see 3.12)8
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c. Color and surface condition (see 3.12): d. Marking (see 3.13):
e Appearance quality (see 3.14).
4.7.3 Design
SJ20797—2001
Inspect and review the design drawings and documents in accordance with the requirements of Chapter 1 of GJB367.1. Inspect the functional characteristics of the product in accordance with the operating instructions in the product technical manual. 4.7.4Maintainability
Perform according to the provisions of GJB2072.
4.7.5Interchangeability
Replace components, assemblies, parts and modules with the same function and check that the product can work normally. After a slight adjustment, the performance characteristics should meet the requirements.
4.7.6Performance Characteristics
4.7.6.1Frequency Error
Frequency Error shall be measured in accordance with Article 6.1 of GB/T6934. 4.7.6.2Frequency Stability
Frequency Stability shall be measured in accordance with Article 6.2 of GB/T6934. 4.7.6.3Evaporation Sensitivity
Benchmark Sensitivity shall be measured in accordance with Article 6.3 of GB/T6934. 4.7.6.4Intermediate Frequency Selectivity
Intermediate Frequency Selectivity shall be measured in accordance with Article 6.8 of GB/T6934. 4.7.6.5 Total distortion factor
Total distortion factor shall be measured in accordance with Article 6.9 of GB/T6934. 4.7.6.6 Relative audio intermodulation
Relative audio intermodulation shall be measured in accordance with Article 6.10 of GB/T6934. 4.7.6.7 Out-of-band intermodulation
Out-of-band intermodulation shall be measured in accordance with Article 6.12 of GB/T6934. 4.7.6.8 Blocking
Blocking shall be measured in accordance with Article 6.14 of GB/T6934. 4.7.6.9 Reciprocal mixing
Reciprocal mixing shall be measured in accordance with Article 6.15 of GB/T6934. 4.7.6.10 IF rejection ratio
IF rejection ratio shall be measured in accordance with Article 6.16 of GB/T6934. 4.7.6.11 Image suppression ratio
Image suppression ratio shall be measured in accordance with Article 6.17 of GB/T6934. 4.7.6.12 Spurious frequency suppression ratio
Spurious frequency suppression ratio shall be measured in accordance with Article 6.18 of GB/T6934. 4.7.6.13 Combination tone
Combination tone shall be measured in accordance with Article 6.19 of GB/T6934. 4.7.6.14 Automatic gain control characteristics
SJ20797—2001
Automatic gain control characteristics shall be measured in accordance with Article 6.20 of GB/T6934. 4.7.6.15 RF gain control
RF gain control shall be measured in accordance with Article 6.21 of GB/T6934. 4.7.6.16 Conducted spurious components on the antenna The conducted spurious components on the antenna shall be measured in accordance with Article 6.23 of GB/T6934. 4.7.6.17 Frequency measurement accuracy
8. Connect the equipment according to Figure 1:
Digital signal generator
Receiver to be tested
b. Adjust the receiver to the specified working type, passband width and working frequency;c. According to the passband width of the receiver to be tested, adjust the frequency of the digital signal generator to the positive and negative deviation frequency from the working frequency of the receiver to be tested, and the frequency deviation is half of the passband width:d. Start the automatic search function of the receiver to be tested, and the receiver should be locked on the frequency of the digital signal generator:e. Observe the displayed frequency of the receiver. The difference between the displayed frequency and the frequency of the digital signal generator is the frequency measurement accuracy. 4.7.6.18 Level measurement accuracy
a.Connect the equipment as shown in Figure 1:
b. Adjust the digital signal generator to a certain frequency and level: c. Start the automatic search function of the receiver to be tested. The receiver should lock and display the level value. The difference between its level value and the output level of the digital signal generator is the level measurement accuracy. 4.7.6.19 Frequency switching time
Connect the equipment according to Figure 2:
RF signal
Generator G1
Mixed matching network
RF signal
Generator G2
Receiver to be tested
Oscilloscope
b. Adjust G1 and G2 respectively, so that they output single-frequency signals with frequencies of and f and output level of 52dBμV respectively; adjust the working state of the receiver to "J3E", the window time to 0.5s, the threshold level to 99dB: and store the frequency 1kHz lower than fc.
the frequency 1kHz lower than f into the two channels of the receiver respectively: d. Adjust the receiver gain so that the Y-axis amplitude of the oscilloscope is 20mm high: make the receiver and five automatically cycle search, observe the waveform cracks on the oscilloscope, and measure the time occupied by the cracks, which is the frequency switching time.
4.7.6.20 Frequency range
At the highest and lowest frequencies in the frequency range specified by the receiver, measure the reference sensitivity in accordance with 4.7.6.3. The result shall comply with 3.6.310
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