This standard applies to 8GHz analog microwave relay communication systems and equipment. These systems and equipment are mainly used to form branches of wireless communication circuits, medium and short distance communication circuits between satellite stations and/or between satellite ground stations and communication centers, and within the province. They can also be used for long distance communication circuits. The communication capacity of each radio frequency channel in this standard is 60 to 960 channels of frequency division multiplexing frequency modulation multi-channel telephone or one channel of color television with up to four accompanying audio programs. GB/T 9050-1988 General Technical Requirements for 8GHZ Microwave Communication Equipment of Analog Microwave Relay Communication System GB/T9050-1988 Standard Download Decompression Password: www.bzxz.net

UDC 621.396.6
National Standard of the People's Republic of China
GB/T 9050—1988
Analog Microwave Relay Communication System
General Specifications for 8 GHz Microwave Communication Equipment
General Specifications for 8 GHz band microwave communication equipment used in analogue radio-relay systems issued on February 10, 1988
implemented on January 1, 1989
Ministry of Posts and Telecommunications of the People's Republic of China
National Standard of the People's Republic of China
Analogue microwave relay communication system
General technical conditions for 8GHz microwave communication equipment
General Specifications for 8GHz band microwave communication equipment used in analogue radio-relay systems UDC621.396.6
GB/T9050—1988
This standard applies to 8GHz ground analogue microwave relay communication systems and equipment. These systems and equipment are mainly used to form branches of wireless communication circuits, medium and short distance communication circuits between satellite ground stations or between satellite ground stations and communication centers, and within the province, and can also be used for long distance communication circuits.
The communication capacity of each radio frequency channel in this standard is 60 to 960 frequency division multiplexing frequency modulation multi-channel telephone or one channel with up to four accompanying audio programs.
1 Reference standards
GB2789-81 "Basic technical requirements for network interface of analog microwave relay communication system" GB6361-86 "Spectrum series of parabolic antennas for microwave relay communication system" GB2423·1-81 "Basic environmental test procedures for electric and electronic products" Test A: Low temperature test method GB2423·2-81 "Basic environmental test procedures for electric and electronic products" Test B: High temperature test method GB2423·3-81 "Basic environmental test procedures for electric and electronic products" Environmental Test Procedures》Test Ca: Steady Humidity Test Method GB2423·4-81 "Basic Environmental Test Procedures for Electrical and Electronic Products" Test Db: Alternating Humidity Method GB191-1973 "Packaging, Storage and Transportation Instructions" GB3873-1983 "General Technical Conditions for Packaging of Communication Equipment Products" GB3659-1983 "Test Methods for Television Channels" 2 Terms and Terms
Assumed Reference Circuit: A hypothetical circuit of limited length consisting of a certain number of intermediate devices and terminal devices. The number of these devices is large enough, but not too large.
Isotropic Segment: It is a segment established in the system under investigation. On this segment, there is neither branching nor any modulation and demodulation of the main signal except for the settings specified at the terminal. 3 Equipment classification
The main equipment of this system can be divided into:
a. Microwave transceiver;
b. Microwave transceiver (including modulation, demodulation equipment, channel standby switching device); c. Telephone modem;
7725~8275MHz frequency band, with adjacent waveguides spaced 29.65MHz, can be used to transmit one color TV and up to four audio program signals, approved by the Ministry of Posts and Telecommunications of the People's Republic of China on February 10, 1988 and implemented on January 1, 1989
d. TV modem;
e. Antenna;
f. Feeder;
g. Channel splitting and paralleling equipment;
h. Remote monitoring master control machine;
i. Remote monitoring slave machine;
j. Channel switching machine;
k. Business liaison machine;
4 Technical requirements
4.1 Equipment working conditions
4.1.1 Normal working conditions
GB/T9050—1988
Under the following working conditions, the equipment should all meet the index requirements. Temperature: 540℃ (outdoor passive equipment is -40～+55℃): Relative humidity: less than 90% (temperature 5~30℃); Air pressure: 86~106kPa;
Power supply voltage: rated value -24V, change range ±10%. 4.1.2 Extreme working conditions
When any of the following conditions occurs, the equipment should be able to work, but the technical indicators are allowed to exceed. When the conditions are restored to the requirements of 4.1.1, the equipment should all meet the index requirements.
Temperature: 0~5℃ or 40~45℃;
Relative humidity: 90%~95% (temperature 0~30℃); Air pressure: as low as 70kPa;
Power supply voltage: -21~27V.
4.1.3 Standard test conditions
4.1.3.1 Standard power supply conditions, power supply voltage deviation should not be greater than the nominal value (-24V) ± 2%. 4.1.3.2 Standard atmospheric conditions:
a: Benchmark standard atmospheric conditions:
Temperature: 20℃;
Air pressure: 101.3kPa.
b. Normal test atmospheric conditions:
Temperature: 15~35℃;
Relative humidity: 45%~75%;
Air pressure: 36~106kPa.
4.1.4 Basic environmental test
Perform necessary adaptability tests according to GB2423.1～2423.4. 4.2 RF channel frequency configuration
4.2.17725～8275MHz working frequency band
Configure 8 bidirectional RF channels within 550MHz bandwidth. As shown in Figure 1. The receiving and transmitting frequencies of all channels are placed in the upper or lower half of the frequency band, and the frequency interval between adjacent channels is 29.65MHz. The nearest receiving and transmitting frequency interval is 103.77MHz, and the receiving and transmitting frequency interval of the same channel is 311.32MHz. The center frequency of the frequency band is fo=8000MHz. The center frequency of each channel in the lower half of the frequency band is:
f=fo—281.95+29.65m
The center frequency of each channel in the upper half of the frequency band is:
f'=fo+29.37+29.65n
Where n=1,2,3,4,5,6,7 and 8.
GB/T9050—1988
Adjacent waveguides should alternately use the horizontal polarization and vertical polarization of the antenna. When the transmission and reception share one antenna and one antenna accommodates four waveguides, the center frequency of the waveguide should be selected so that n=1,3,5,7 or 2,4,6,8.
4.2.28200～8500MHz working frequency band
fo=8000
23'4'5'6'7'8
Unit: MHz
Six bidirectional RF waveguides are configured within the 300MHz bandwidth, as shown in Figure 2: the receiving and transmitting frequencies of all channels are respectively placed in the upper or lower half of the frequency band, the frequency interval of adjacent channels is 23.324MHz, the interval between the nearest receiving and transmitting frequencies is 35MHz, the interval between the receiving and transmitting frequencies of the same channel is 151.614MHz, and the center frequency of the frequency band is fo=8350MHz. The center frequency of each channel in the lower half of the frequency band is:
f,=fo—163.276+23.324n
The center frequency of each channel in the upper half of the frequency band is:
f'=fo—11.662+23.324n
Where n=1,2,3,4,5 and 6.
Adjacent waveguides should alternately use the horizontal polarization and vertical polarization of the antenna. When the transmission and reception share a common antenna, and one antenna accommodates three waveguides, for a system with a capacity of 960 frequency division multiplexing multi-channel telephone or equivalent capacity, the waveguide frequency should be selected so that n=1,3,5 or n=2,4,6. When it is necessary to insert an additional waveguide between the waveguides of the main waveguide frequency configuration scheme, the center frequency of the additional waveguide should be selected to be 11.662MHz higher than the center frequency of the main waveguide.
4.2.38500～8750MHz working frequency band
f=8350
Unit: MHz
Six bidirectional RF waveguides are configured in a 250MHz bandwidth, as shown in Figure 3. The frequency interval of adjacent waveguides is 15MHz, the interval between the nearest receiving and transmitting frequencies is 75MHz, and the interval between the receiving and transmitting frequencies of the same waveguide is 150MHz. All receiving and transmitting frequencies are placed in the upper or lower half of the frequency band respectively. The center frequency of the frequency band is fo=8629.5MHz. The center frequency of each channel in the lower half of the frequency band is:
f,=fo—127.5+15m
The center frequency of each waveguide in the upper half of the frequency band is:
f'=fo+22.5+15m
where n=1,2,34,5 and 6.
GB/T9050—1988
The adjacent waveguides should alternately use the horizontal polarization and vertical polarization of the antenna. When the transmission and reception share a common antenna, and one antenna accommodates three channels, the channel center frequency should be selected so that n=1,3,5 or 2,4,6.
When the capacity of each radio frequency channel is as high as 960 frequency division multiplexing multiplexed telephones or its equivalent, the channel center frequency is preferably selected as n=1,5 or 2,6.
4.3 Assumed reference circuit
4.3.1 The telephone transmission assumed reference circuit is divided into three categories. 4.3.1.1 The first type of assumed reference circuit:
J. =8629.5
Unit: MHz
The length is 1000km, divided into 5 equal-quality segments, each of which consists of 5 relay segments. These relay segments only perform intermediate frequency or radio frequency switching, as shown in Figure 4.
4.3.1.2 The second type of hypothetical reference circuit:
Unit: km
The length is 540km, divided into three equal-quality segments, each of which consists of 5 equal-length relay segments. These relay segments only perform intermediate frequency or radio frequency switching, as shown in Figure 5.
Legend:
Carrier channel modulation level
Carrier base group modulation level
Carrier super group modulation level
4.3.1.3 The third type of hypothetical reference circuit:
V+S+F radio circuit
m
Unit: km
GB/T9050—1988
The length is 300km, which is evenly divided into 8 baseband switching relay segments, as shown in Figure 6. 300
·m·m·m·m*m·*·
4.3.2 The hypothetical reference circuit for television is divided into three categories. Unit: km
4.3.2.1 The first type of circuit is 1000km long, with a video connection point M in the middle to divide the circuit into two equal sections. Each equal section is independent and is connected to each other without any overall adjustment or correction. The circuit does not include a standard converter, nor does it include a pulse regenerator or a signal insertion device during line blanking and field blanking. As shown in Figure 7. Each isotropic section consists of 13 relay sections. Except for the two end stations, each relay station only performs intermediate frequency or radio frequency switching (excluding the separation of television signals). 1000
Unit: km
4.3.2.2 The second type of circuit is 540km long and consists of 15 relay sections. Except for the two end stations that perform video switching, the remaining relay stations only perform intermediate frequency or radio frequency switching (excluding the separation of television signals). As shown in Figure 8. 540
Unit: km
4.3.2.3 The third type of circuit is 40km long and consists of one relay section for video switching. As shown in Figure 9. 40
Unit: km
4.3.3 Audio program hypothetical reference circuit:
Consistent with the corresponding television hypothetical reference circuit. 4.4 Performance indicators of hypothetical reference circuits
4.4.1 Performance indicators of telephone hypothetical reference circuits On the three hypothetical reference circuits, taking into account unfavorable propagation conditions, the noise power at the zero relative level point in any voice channel should not exceed the following specified values:
a. In any month, for more than 20% of the time, the weighted one-minute average power of the noise meter is 7500pW; b. In any month, for more than 0.1% of the time, the weighted one-minute average power of the noise meter is 47500pW; c. In any month, for more than 0.01% of the time, the unweighted noise power (integration time 5ms) is 1000000pW. When the above performance indicators are further subdivided, the noise in item a and the time percentages in items b and c should be regarded as proportional to the number of equal-quality segments. The distribution of performance indicators derived from the hypothetical reference circuit in the equipment is shown in Appendix A. 4.4.2 Performance indicators of TV segment reference circuit 4.4.2.1 Weighted signal-to-noise ratio of continuous random noise On the first and second TV hypothetical reference circuits, the weighted signal-to-noise ratio of the continuous random noise of the brightness signal should not be lower than the following specified values: 5
a. 57dB for more than 20% of the time in any month; b. 53dB for more than 1% of the time in any month; GB/T9050-1988
c. 45dB for more than 0.1% of the time in any month; On the third TV hypothetical reference circuit, the weighted signal-to-noise ratio of the continuous random noise of the brightness signal refers to GB1583. When the above performance indicators are further subdivided, the average noise power of items a and b and the percentage of time of item c should be regarded as proportional to the number of equal-quality segments contained.
4.4.2.2 Other performance indicators
For other performance indicators of the TV hypothetical reference circuit and the distribution of each performance indicator in the equipment, see Appendix B. 4.4.3 Performance indicators of the hypothetical reference circuit for audio programs 4.4.3.1 Weighted signal-to-noise ratio of audio programs
On the first and second hypothetical reference circuits, the weighted signal-to-noise ratio of the audio program should not be lower than the following specified values: a. 48 dB for more than 20% of the time in any month; b. 44 dB for more than 1% of the time in any month; c. 36 dB for more than 0.1% of the time in any month; On the third hypothetical reference circuit, the weighted signal-to-noise ratio of the audio program should not be lower than the following specified values: a. 57 dB for more than 20% of the time in any month; b. 53 dB for more than 1% of the time in any month; c. 45 dB for more than 0.1% of the time in any month; When the above performance indicators are subdivided, the average noise power of items a and b and the time percentage of item c should be considered to be proportional to the number of equal-quality segments.
4.4.3.2 Other performance indicators
The distribution of performance indicators derived from the hypothetical reference circuit in the equipment is shown in Appendix C. 4.5 Switching characteristics of equipment
4.5.1 The baseband interface requirements of telephone channels shall comply with GB2789. 4.5.2 The intermediate frequency interface requirements shall comply with GB2789.
4.5.3 The video and audio interface requirements shall comply with GB2789. 4.5.4 The RF input and output ports use three types of rectangular waveguides: R-100, R-84 and R-70. 4.6 System availability indicators and protection monitoring functions 4.6.1 System availability
The availability of two-way transmission of the microwave relay system on the specified assumed reference circuit shall not be less than 99.5% per year. 4.6.2 Protection function and channel switching
4.6.2.1 A standby channel and an automatic channel switching device shall be set to reduce the interruption time of information transmission on the working channel. The maximum ratio of the working channel to the standby channel is 7:1 or 6:2.
4.6.2.2 The automatic channel switching device shall have the following functions: 4.6.2.2.1 It shall be capable of switching at the baseband (video) or intermediate frequency point, or both of the above two switching functions. 4.6.2.2.2 A maximum of 7:1 multi-line switching is allowed. 4.6.2.2.3 The automatic channel switching device shall provide switching when one of the following conditions occurs in the working channel. a. The weighted noise power of a voice channel relative to the zero level point is as high as 5×10*～5×105pW; b. The pilot level is 4～8dB lower than the normal value; c. The video weighted signal-to-noise ratio is as low as 45～48dB; 4.6.2.2.4 When the switched working channel returns to normal, the automatic switching device shall be able to make it withdraw from the occupied standby channel 4.6.2.3 A remote monitoring device shall be set up to provide perfect maintenance performance and effectively reduce the mean time to repair faults. The remote monitoring device should have the following functions:
GB/T9050—1988
a. The master control station remotely controls and telemeters the equipment and environment of the controlled station. b. When the equipment of the controlled station fails or the environmental conditions deteriorate, the master control station automatically alarms, displays and records. 4.7 Transmission of auxiliary signals
4.7.1 The auxiliary signals that may need to be transmitted include the following: a. Business telephone used for inter-station communication, with a frequency of 0.3~3.4kHz; b. Monitoring signal, with a frequency of 4.3~10.3kHz; c. Direct business telephone used for terminal stations, with a frequency of 12~20kHz; d. Channel switching signal, with a frequency of 25~45kHz. 4.7.2 Transmission performance of auxiliary signals. On the assumed reference circuit, the weighted noise power relative to the zero level point within any 3.1kHz bandwidth should not exceed 20000pW.
4.7.3 Interface characteristics of auxiliary signals:
The interface characteristics of the equipment should be specified in the technical documents of the equipment, including input and output impedance, input and output levels, signal test audio frequency and frequency deviation, pilot frequency and frequency deviation. 4.7.4 Auxiliary signal transmission adopts one of the following methods: a. Independent auxiliary microwave relay communication system; b. Transmission below the telephone baseband frequency or above the baseband (video) frequency together with the main signal; c. Independent transmission system composed of other transmission means, 4.8 Antenna, feeder, channel splitting and paralleling equipment 4.8.1 The parameters such as antenna aperture determined by communication capacity and transmission distance shall comply with the provisions of GB6361. 4.8.2 The feeder shall be composed of circular, rectangular waveguide or elliptical semi-flexible waveguide and its corresponding waveguide elements. When the feeder length is more than 20m, it shall have air sealing and inflation devices. 4.8.3 The channel splitting and paralleling equipment shall consist of waveguide circulator and bandpass filter, and the standing wave ratio in the passband shall not be greater than 1.1. The cross-sectional dimensions of the waveguide shall be consistent with the dimensions of the input and output ports of the transceiver. 4.9 The mechanical structure of the equipment
According to GB3047.
5 Test methods
See Appendix D.
6 Inspection rules
6.1 Except for special provisions, the inspection and test conditions of the equipment shall be tested according to the working conditions in 4.1.1. 6.2 After all indicators of the product are tested and qualified and the records are filled in, it shall be submitted for inspection. Products that have passed the inspection can only leave the factory after the quality inspection department issues a certificate of conformity.
6.3 The technical documents of the equipment should specify the full inspection and sampling inspection items. 6.3.1 Full inspection items refer to the items that need to be inspected for each equipment. In the full inspection items, if any indicator fails, the machine is unqualified. 6.3.2 The implementation of the sampling inspection items is to randomly select 10% (at least not less than two pieces) of the products that have passed the full inspection items for indicator testing. If any indicator of any item fails, double sampling is conducted to inspect the indicator. If all indicators are qualified, the above-mentioned unqualified products are individual problems. After repair, the products submitted for inspection are all qualified products. If the indicators are still unqualified after double sampling, all the products submitted for inspection are unqualified.
6.3.3 The environmental condition test shall be carried out in accordance with the provisions of GB2423.1~2423.4. 7 Marking, packaging, transportation and storage
7.1 Marking shall be implemented in accordance with the provisions of GB191.
7.2 Packaging, transportation and storage shall comply with the provisions of GB3873. The packaging of the equipment shall comply with the provisions of rainproof, first-level moisture-proof and shockproof. 7
GB/T9050—1988
Appendix A
Distribution of performance indicators of telephone hypothetical reference circuit (supplement)
A1 For most of the time, it is assumed that the part of the reference circuit noise power is proportional to the number of equal-quality segments. The unweighted noise power of each equal-quality segment should be:
—The number of equal-quality segments;
Where: M
1.8—Weighting coefficient.
Different types of equipment are allowed to have different distribution of various indicators, but the unweighted noise power of the channel of an equal-quality segment shall not exceed A2
7500/MX1.8pW. Where M is the number of equal-quality segments. A3
Noise power distribution of a homogeneous section, see Tables A1 to A3. 1000km hypothetical reference circuit
Noise distribution table of a homogeneous section
Thermal noise
Interference noise
Slope term
Curvature term
This line
Nonlinearity 30
Group delay 270
Amplitude distortion 100
Nonlinearity 20
Group delay 180
Amplitude distortion 100
Echo interference 230
Antenna system
Note: 1) Allocated to systems with a capacity greater than 960 channels. 8
Each microwave transceiver
Each modulator and demodulator
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator
Each channel switching machine
Each microwave transceiver
Each modulator and demodulator
Each channel switching machine
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator
Each channel switching machine
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator Demodulator
Each channel switch
Each microwave transceiver
Each modulation and demodulation machine
Each channel switch
Third-line interference
Each waveguide feeder
Each intermediate frequency cable
Front-to-back
Cross-station interference
Propagation distortion
Branch circuit
Thermal noise
Interference noise
Slope term||tt| |Curvature term
This line
540km assumed reference circuit
Noise distribution table for a uniform section
Each microwave transceiver
Each modulator and demodulator
Nonlinear distortion 80
Group delay 620
Amplitude distortion 200
Nonlinearity 40
Group delay 380
Amplitude distortion 180
Echo interference 260|| tt||Antenna system
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator
Each channel switching device
Each microwave transceiver
Each modulator and demodulator
Each channel switching device
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator
Each channel switching device|| tt||Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each feeder
Each intermediate frequency cable
Front to back
Propagation distortion
Branch circuit
Thermal noise
Interference noise
Slope term
Curvature term
This line
Allocation principle
GB/T9050—19 88
300km hypothetical reference circuit
Nonlinearity 60
Group delay 200
Amplitude distortion 140
Nonlinearity 20
Group delay 140
Amplitude distortion 40
Echo interference 100
Antenna system 200
Noise allocation table for baseband switching sections
Each microwave transceiver
Each modulator and demodulator|| tt||Each modulation and demodulation machine
Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each modulation and demodulation machine
Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each feeder
Each intermediate frequency cable
Front to back
Propagation distortion
Branch circuit
Appendix B
Allocation of performance indicators of television hypothetical reference circuit (supplement)
Assume that the performance of the microwave transceiver only affects the signal-to-noise ratio of the brightness signal and the accompanying sound signal, the differential gain and differential phase of the color signal. The other performance indicators of the television channel are mainly dominated by the modulation and demodulation performance. The distribution of performance indicators of the television hypothetical reference circuit is shown in Table B1. B2
Addition law
For most of the time, the addition law of continuous random noise voltage is:2 The implementation of the sampling project is to randomly select 10% (at least not less than two pieces) of the qualified products in the full inspection project for index testing. If any index of any item fails, double sampling is conducted to test the index. If all the indexes are qualified, the above unqualified products are individual problems. After repair, all the products submitted for inspection are qualified products. If the index is still unqualified after double sampling, all the products submitted for inspection are unqualified.
6.3.3 Environmental condition test shall be carried out in accordance with GB2423.1~2423.4. 7 Marking, packaging, transportation and storage
7.1 Marking shall be implemented in accordance with GB191.
7.2 Packaging, transportation and storage shall be carried out in accordance with GB3873. The packaging of the equipment shall comply with the provisions of rainproof, first-level moisture-proof and shockproof. 7
GB/T9050—1988
Appendix A
Distribution of performance indicators of telephone hypothetical reference circuit (supplement)
A1 For most of the time, it is assumed that the part of the reference circuit noise power is proportional to the number of equal-quality segments. The unweighted noise power of each equal-quality segment should be:
—the number of equal-quality segments;
where: M
1.8—weighting coefficient.
Different types of equipment may allow different distribution of various indicators, but the unweighted noise power of a equal-quality segment shall not exceed A2
7500/MX1.8pW. Where M is the number of equal-quality segments. A3
Noise power distribution of a homogeneous section, see Tables A1 to A3. 1000km hypothetical reference circuit
Noise distribution table of a homogeneous section
Thermal noise
Interference noise
Slope term
Curvature term
This line
Nonlinearity 30
Group delay 270
Amplitude distortion 100
Nonlinearity 20
Group delay 180
Amplitude distortion 100
Echo interference 230
Antenna system
Note: 1) Allocated to systems with a capacity greater than 960 channels. 8
Each microwave transceiver
Each modulator and demodulator
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator
Each channel switching machine
Each microwave transceiver
Each modulator and demodulator
Each channel switching machine
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator
Each channel switching machine
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator Demodulator
Each channel switch
Each microwave transceiver
Each modulation and demodulation machine
Each channel switch
Third-line interference
Each waveguide feeder
Each intermediate frequency cable
Front-to-back
Cross-station interference
Propagation distortion
Branch circuit
Thermal noise
Interference noise
Slope term||tt| |Curvature term
This line
540km assumed reference circuit
Noise distribution table for a uniform section
Each microwave transceiver
Each modulator and demodulator
Nonlinear distortion 80
Group delay 620
Amplitude distortion 200
Nonlinearity 40
Group delay 380
Amplitude distortion 180
Echo interference 260|| tt||Antenna system
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator
Each channel switching device
Each microwave transceiver
Each modulator and demodulator
Each channel switching device
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator
Each channel switching device|| tt||Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each feeder
Each intermediate frequency cable
Front to back
Propagation distortion
Branch circuit
Thermal noise
Interference noise
Slope term
Curvature term
This line
Allocation principle
GB/T9050—19 88
300km hypothetical reference circuit
Nonlinearity 60
Group delay 200
Amplitude distortion 140
Nonlinearity 20
Group delay 140
Amplitude distortion 40
Echo interference 100
Antenna system 200
Noise allocation table for baseband switching sections
Each microwave transceiver
Each modulator and demodulator|| tt||Each modulation and demodulation machine
Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each modulation and demodulation machine
Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each feeder
Each intermediate frequency cable
Front to back
Propagation distortion
Branch circuit
Appendix B
Allocation of performance indicators of television hypothetical reference circuit (supplement)
Assume that the performance of the microwave transceiver only affects the signal-to-noise ratio of the brightness signal and the accompanying sound signal, the differential gain and differential phase of the color signal. The other performance indicators of the television channel are mainly dominated by the modulation and demodulation performance. The distribution of performance indicators of the television hypothetical reference circuit is shown in Table B1. B2
Addition law
For most of the time, the addition law of continuous random noise voltage is:2 The implementation of the sampling project is to randomly select 10% (at least not less than two pieces) of the qualified products in the full inspection project for index testing. If any index of any item fails, double sampling is conducted to test the index. If all the indexes are qualified, the above unqualified products are individual problems. After repair, all the products submitted for inspection are qualified products. If the index is still unqualified after double sampling, all the products submitted for inspection are unqualified.
6.3.3 Environmental condition test shall be carried out in accordance with GB2423.1~2423.4. 7 Marking, packaging, transportation and storage
7.1 Marking shall be implemented in accordance with GB191.
7.2 Packaging, transportation and storage shall be carried out in accordance with GB3873. The packaging of the equipment shall comply with the provisions of rainproof, first-level moisture-proof and shockproof. 7
GB/T9050—1988
Appendix A
Distribution of performance indicators of telephone hypothetical reference circuit (supplement)
A1 For most of the time, it is assumed that the part of the reference circuit noise power is proportional to the number of equal-quality segments. The unweighted noise power of each equal-quality segment should be:
—the number of equal-quality segments;
where: M
1.8—weighting coefficient.
Different types of equipment may allow different distribution of various indicators, but the unweighted noise power of a equal-quality segment shall not exceed A2
7500/MX1.8pW. Where M is the number of equal-quality segments. A3
Noise power distribution of a homogeneous section, see Tables A1 to A3. 1000km hypothetical reference circuit
Noise distribution table of a homogeneous section
Thermal noise
Interference noise
Slope term
Curvature term
This line
Nonlinearity 30
Group delay 270
Amplitude distortion 100
Nonlinearity 20
Group delay 180
Amplitude distortion 100
Echo interference 230
Antenna system
Note: 1) Allocated to systems with a capacity greater than 960 channels. 8
Each microwave transceiver
Each modulator and demodulator
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator
Each channel switching machine
Each microwave transceiver
Each modulator and demodulator
Each channel switching machine
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator
Each channel switching machine
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator Demodulator
Each channel switch
Each microwave transceiver
Each modulation and demodulation machine
Each channel switch
Third-line interference
Each waveguide feeder
Each intermediate frequency cable
Front-to-back
Cross-station interference
Propagation distortion
Branch circuit
Thermal noise
Interference noise
Slope term||tt| |Curvature term
This line
540km assumed reference circuit
Noise distribution table for a uniform section
Each microwave transceiver
Each modulator and demodulator
Nonlinear distortion 80
Group delay 620
Amplitude distortion 200
Nonlinearity 40
Group delay 380
Amplitude distortion 180
Echo interference 260|| tt||Antenna system
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator
Each channel switching device
Each microwave transceiver
Each modulator and demodulator
Each channel switching device
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator
Each channel switching device|| tt||Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each feeder
Each intermediate frequency cable
Front to back
Propagation distortion
Branch circuit
Thermal noise
Interference noise
Slope term
Curvature term
This line
Allocation principle
GB/T9050—19 88
300km hypothetical reference circuit
Nonlinearity 60
Group delay 200
Amplitude distortion 140
Nonlinearity 20
Group delay 140
Amplitude distortion 40
Echo interference 100
Antenna system 200
Noise allocation table for baseband switching sections
Each microwave transceiver
Each modulator and demodulator|| tt||Each modulation and demodulation machine
Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each modulation and demodulation machine
Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each feeder
Each intermediate frequency cable
Front to back
Propagation distortion
Branch circuit
Appendix B
Allocation of performance indicators of television hypothetical reference circuit (supplement)
Assume that the performance of the microwave transceiver only affects the signal-to-noise ratio of the brightness signal and the accompanying sound signal, the differential gain and differential phase of the color signal. The other performance indicators of the television channel are mainly dominated by the modulation and demodulation performance. The distribution of performance indicators of the television hypothetical reference circuit is shown in Table B1. B2
Addition law
For most of the time, the addition law of continuous random noise voltage is:8pW. Where M is the number of equal-quality segments. A3
For the noise power distribution of an equal-quality segment, see Tables A1 to A3. 1000km hypothetical reference circuit
Noise distribution table of an equal-quality segment
Thermal noise
Interference noise
Slope term
Curvature term
This line
Nonlinearity 30
Group delay 270
Amplitude distortion 100
Nonlinearity 20
Group delay 180
Amplitude distortion 100
Echo interference 230
Antenna system
Note: 1) Allocated to a system with a capacity greater than 960 channels. 8
Each microwave transceiver
Each modulator and demodulator
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator
Each channel switching machine
Each microwave transceiver
Each modulator and demodulator
Each channel switching machine
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator
Each channel switching machine
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator Demodulator
Each channel switch
Each microwave transceiver
Each modulation and demodulation machine
Each channel switch
Third-line interference
Each waveguide feeder
Each intermediate frequency cable
Front-to-back
Cross-station interference
Propagation distortion
Branch circuit
Thermal noise
Interference noise
Slope term||tt| |Curvature term
This line
540km assumed reference circuit
Noise distribution table for a uniform section
Each microwave transceiver
Each modulator and demodulator
Nonlinear distortion 80
Group delay 620
Amplitude distortion 200
Nonlinearity 40
Group delay 380
Amplitude distortion 180
Echo interference 260|| tt||Antenna system
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator
Each channel switching device
Each microwave transceiver
Each modulator and demodulator
Each channel switching device
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator
Each channel switching device|| tt||Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each feeder
Each intermediate frequency cable
Front to back
Propagation distortion
Branch circuit
Thermal noise
Interference noise
Slope term
Curvature term
This line
Allocation principle
GB/T9050—19 88
300km hypothetical reference circuit
Nonlinearity 60
Group delay 200
Amplitude distortion 140
Nonlinearity 20
Group delay 140
Amplitude distortion 40
Echo interference 100
Antenna system 200
Noise allocation table for baseband switching sections
Each microwave transceiver
Each modulator and demodulator|| tt||Each modulation and demodulation machine
Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each modulation and demodulation machine
Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each feeder
Each intermediate frequency cable
Front to back
Propagation distortion
Branch circuit
Appendix B
Allocation of performance indicators of television hypothetical reference circuit (supplement)
Assume that the performance of the microwave transceiver only affects the signal-to-noise ratio of the brightness signal and the accompanying sound signal, the differential gain and differential phase of the color signal. The other performance indicators of the television channel are mainly dominated by the modulation and demodulation performance. The distribution of performance indicators of the television hypothetical reference circuit is shown in Table B1. B2
Addition law
For most of the time, the addition law of continuous random noise voltage is:8pW. Where M is the number of equal-quality segments. A3
For the noise power distribution of an equal-quality segment, see Tables A1 to A3. 1000km hypothetical reference circuit
Noise distribution table of an equal-quality segment
Thermal noise
Interference noise
Slope term
Curvature term
This line
Nonlinearity 30
Group delay 270
Amplitude distortion 100
Nonlinearity 20
Group delay 180
Amplitude distortion 100
Echo interference 230
Antenna system
Note: 1) Allocated to a system with a capacity greater than 960 channels. 8
Each microwave transceiver
Each modulator and demodulator
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulatorbZxz.net
Each channel switching machine
Each microwave transceiver
Each modulator and demodulator
Each channel switching machine
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator
Each channel switching machine
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator Demodulator
Each channel switch
Each microwave transceiver
Each modulation and demodulation machine
Each channel switch
Third-line interference
Each waveguide feeder
Each intermediate frequency cable
Front-to-back
Cross-station interference
Propagation distortion
Branch circuit
Thermal noise
Interference noise
Slope term||tt| |Curvature term
This line
540km assumed reference circuit
Noise distribution table for a uniform section
Each microwave transceiver
Each modulator and demodulator
Nonlinear distortion 80
Group delay 620
Amplitude distortion 200
Nonlinearity 40
Group delay 380
Amplitude distortion 180
Echo interference 260|| tt||Antenna system
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator
Each channel switching device
Each microwave transceiver
Each modulator and demodulator
Each channel switching device
Each modulator and demodulator
Each microwave transceiver
Each modulator and demodulator
Each channel switching device|| tt||Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each feeder
Each intermediate frequency cable
Front to back
Propagation distortion
Branch circuit
Thermal noise
Interference noise
Slope term
Curvature term
This line
Allocation principle
GB/T9050—19 88
300km hypothetical reference circuit
Nonlinearity 60
Group delay 200
Amplitude distortion 140
Nonlinearity 20
Group delay 140
Amplitude distortion 40
Echo interference 100
Antenna system 200
Noise allocation table for baseband switching sections
Each microwave transceiver
Each modulator and demodulator|| tt||Each modulation and demodulation machine
Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each modulation and demodulation machine
Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each microwave transceiver
Each modulation and demodulation machine
Each channel switching device
Each feeder
Each intermediate frequency cable
Front to back
Propagation distortion
Branch circuit
Appendix B
Allocation of performance indicators of television hypothetical reference circuit (supplement)
Assume that the performance of the microwave transceiver only affects the signal-to-noise ratio of the brightness signal and the accompanying sound signal, the differential gain and differential phase of the color signal. The other performance indicators of the television channel are mainly dominated by the modulation and demodulation performance. The distribution of performance indicators of the television hypothetical reference circuit is shown in Table B1. B2
Addition law
For most of the time, the addition law of continuous random noise voltage is:
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