CN1983828A - Terminal scramble testing system and method - Google Patents
Terminal scramble testing system and method Download PDFInfo
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- CN1983828A CN1983828A CNA2006100827804A CN200610082780A CN1983828A CN 1983828 A CN1983828 A CN 1983828A CN A2006100827804 A CNA2006100827804 A CN A2006100827804A CN 200610082780 A CN200610082780 A CN 200610082780A CN 1983828 A CN1983828 A CN 1983828A
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Abstract
The invention is concerned with the terminal stray testing system and the method, the system including: the analyzer, the base station simulator and the automatic controller. It is: the automatic controller connects with the base station simulator, sends the controlling order to the base station simulator in order to create the radio frequency signal from the base station simulator; the automatic controller connects with the analyzer, sends the controlling order to the analyzer, reads the testing result from the analyzer. The invention can improve the testing efficiency with stray; process control to some analyzers to achieve the parallel test; it is also easy to process save of the testing result and the image.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of terminal scramble testing system and method.
Background technology
The transmitter conduction stray performance of terminal is one of important technology index of weighing its radio-frequency performance.The transmitter conduction stray is spuious on the frequency outside the allocated channel band, and the test of transmitter conduction stray is meant the dut terminal test of the spurious emissions during the emission continuously.Spurious emissions refers to the emission on certain or some frequency outside the necessary bandwidth, comprising: harmonic emissions, parasitic emission, intermodulation product and frequency conversion product.Wherein, harmonic emissions refers to that frequency is the spurious emissions of the integral multiple of frequency in the band occupancy; Parasitic emission refers to both not rely on the carrier frequency, characteristic frequency of transmitter and produces, and does not also rely on the local oscillator that produces carrier frequency, characteristic frequency and the emission that produces, and it is a kind of accidental spurious emissions that produces; Intermodulation product is any two or more frequency signal, under the effect of the non-linear property of transmitter, and formed new frequency content; The frequency conversion product is the emission of any spurious frequency of being produced in the process that forms carrier frequency or characteristic frequency, wherein do not comprise the humorous integer multiple frequency that involves of carrier frequency and characteristic frequency.
In general, in the centre frequency both sides, necessary bandwidth place or emission in addition all are spurious emissions, and its result is used to weigh terminal whether can produce interference to the electronic equipment that works in other each frequency range during the emission continuously.
At present, the standard about the transmitter conduction stray performance of test terminal has: the standard TIA/EIA IS-98D of global general-use or 98E and by the YD/T1050 of Ministry of Information Industry's promulgation.In these two standards, basic identical for the transmitter conduction stray method of testing of terminal.
Fig. 1 is the connection layout of existing terminal scramble testing system.As shown in Figure 1, this system comprises analyzer, base station simulator and radio-frequency (RF) switch.
Wherein, base station simulator links to each other with radio-frequency (RF) switch, is used for base station state is simulated, and provides radiofrequency signal by radio-frequency (RF) switch for terminal; Three ports of radio-frequency (RF) switch are connected with base station simulator, analyzer and dut terminal respectively, provide along separate routes, close the function on road; Analyzer is connected with radio-frequency (RF) switch, by radio-frequency (RF) switch, and the radiofrequency signal that receiving terminal sends, and this radiofrequency signal analyzed, obtain test result; Terminal is connected with power supply, is used for to the terminal power supply, and power supply also is subjected to auto-controller control.
Described analyzer can be spectrum analyzer, transmitter measuring and analysing meter, signal analyzer etc.
Described radio-frequency (RF) switch also can be the shunt mixer.
The specific implementation step is as follows:
At first, between dut terminal and base station simulator, set up and call out connection, manually carry out the parameter setting;
The parameter that needs to be provided with has: the power of forward traffic channel is-104dBm/1.23MHz that the power of pilot channel is-7.0dB that the power of Traffic Channel is-15.6dB, terminal emission maximum power, the frequency range of test, the reference power level of test, the resolution bandwidth of test etc.
Then, utilize the analyzer test to be positioned at the spuious of terminal transmitter frequency range centre frequency 4MHz each frequency range in addition, and write down the performance number of the spurious emissions of each frequency range.
Concrete requirement is referring to following form:
The outer spuious index request of table 1 band
| Sequence number | Frequency range (departing from the above frequency values of transmitter frequency range centre frequency 4MHz, is that 830MHz illustrates with the transmitter centre frequency) | Index request (/ resolution bandwidth) |
| ?1 | ?9～150kHz | -36dBm/1kHz |
| ?2 | ?150kHz～30MHz | -36dBm/10kHz |
| ?3 | ?30MHz～826MHz | -36dBm/100kHz |
| ?4 | ?834MHz～1GHz | -36dBm/100kHz |
| ?5 | ?1GHz～3GHz | -30dBm/1MHz |
| ?6 | ?3GHz～12.75GHz | -30dBm/1MHz |
Can draw by frequency-response analysis the cable that is used to connect tester and dut terminal in the test process, signal can reduce through power after the cable transmission during test, that is to say that cable can have decay to signal, and the pad value of each frequency range cable can be different, therefore, all to carry out the calibration of cable pad value respectively to each frequency range.
The method of manual calibration is: base station simulator and analyzer need to be set to the frequency range of test respectively, the radiofrequency signal power of analyzer test input, obtain path 101 between radio-frequency (RF) switch and the analyzer and the path 103 between base station simulator and the radio-frequency (RF) switch by analyzer, and the pad value of the port that is attached thereto.The control radio-frequency (RF) switch, allow the output port of base station simulator link to each other with path 103 respectively with input port, can obtain the decay of path 103, the pad value that the path 101 that calibration for the first time records and the pad value of path 103 deduct the path 103 that records for the second time can draw the pad value of path 101.The pad value of the path 102 between radio-frequency (RF) switch and the dut terminal directly according to the specifications of cable given be worth.
After test is finished,, also need manually to grasp the frequency spectrum graphics of each frequency range of analyzer test in order in report, to provide the test result of visualization.
The method that manually grasps frequency spectrum graphics is: PC is connected with instrument by software, and grasps the current interface displayed of tester by manual order to PC initiation intercepting graphical interfaces, and manually the graphic file that reads is saved in the path of appointment.
From the analysis of above-mentioned test process as can be seen, the transmitter conduction stray method of testing of existing terminal need manually be provided with a plurality of parameters, and the testing time is long, and the efficient of test is low, occurs mistake easily; Be inconvenient to carry out the preservation of test result and the preservation of figure, and can't concurrent testing.
Summary of the invention
In order to address the above problem, one object of the present invention just provides a kind of terminal scramble testing system, can control many analyzers, realizes concurrent testing and conveniently carries out the preservation of test result and figure.
Another object of the present invention is to, a kind of terminal scramble method of testing is provided, improve the outer spuious testing efficiency of band.
Terminal scramble testing system of the present invention comprises analyzer, base station simulator, also comprises auto-controller, and described auto-controller is connected with base station simulator, to the base station simulator transmitting control commands, makes base station simulator produce radiofrequency signal; Described auto-controller is connected with analyzer, to the analyzer transmitting control commands, from analyzer read test result.
Described terminal scramble testing system, also comprise radio-frequency (RF) switch, described radio-frequency (RF) switch links to each other with analyzer, base station simulator and auto-controller respectively, auto-controller is to the radio-frequency (RF) switch transmitting control commands, the break-make of the path of control radio-frequency (RF) switch and base station simulator and the path of radio-frequency (RF) switch and analyzer.
Described radio-frequency (RF) switch is the shunt mixer.
Described auto-controller comprises that parameter is provided with module, test module and logging modle, wherein,
Parameter is provided with module and is used for other instruments of terminal scramble testing system are carried out the initial parameter setting;
Test module is used for sending test command to other instruments of terminal scramble testing system, and reads the test result of these instruments, and test result is sent to logging modle;
Logging modle is used to write down the test result that test module sends.
Described auto-controller also comprises calibration module, is used to measure the pad value of radio frequency path, and this pad value is written to respectively in analyzer and the base station simulator.
Described terminal scramble testing system also comprises gpib interface, and described auto-controller is connected with analyzer, base station simulator and radio-frequency (RF) switch by gpib interface.
Described analyzer is spectrum analyzer, transmitter measuring and analysing meter, signal analyzer.
Terminal scramble method of testing of the present invention may further comprise the steps:
Steps A, auto testing instrument is tested to analyzer and base station simulator transmission test control command, and test result is returned auto testing instrument;
Step B, the test result that the auto testing instrument recorder analyser returns.
Before steps A, also comprise initialization step:
A0, auto testing instrument sends the initialization control command to analyzer and base station simulator, and analyzer and base station simulator are carried out the initial parameter setting.
Described initial parameter is power, the frequency of base station simulator output signal, incoming frequency scope, reference level and the resolution bandwidth of analyzer, power source voltage value, the maximum transmission power of terminal.
The maximum transmission power of described terminal by auto testing instrument by the base station simulator setting, or by auto testing instrument directly to the terminal setting.
Further comprising the steps of before the described steps A:
Steps A 1, auto-controller sends test control command, test access pad value to analyzer and base station simulator;
Steps A 2, auto-controller is provided with control command to an analyzer and a base station simulator transmission parameter, and the path attenuation value is write base station simulator and analyzer.
Described control command is the GPIB control command.
Terminal scramble testing system of the present invention and method have improved the outer spuious testing efficiency of band; Can control many analyzers, realize concurrent testing; Simultaneously can carry out the preservation of test result and figure easily.
Description of drawings
Fig. 1 is the connection layout of existing terminal scramble testing system;
Fig. 2 is the connection layout of terminal scramble testing system specific embodiment of the present invention;
Fig. 3 is the module map of the auto-controller of terminal scramble testing system of the present invention;
Fig. 4 is the flow chart of the calibration process of terminal scramble method of testing of the present invention;
Fig. 5 is the flow chart of terminal scramble method of testing of the present invention.
Embodiment
The present invention is further described in more detail below in conjunction with accompanying drawing 2～5 and specific embodiment.
Fig. 2 is the connection layout of terminal scramble testing system specific embodiment of the present invention, wherein, this terminal scramble testing system comprises analyzer, radio-frequency (RF) switch, base station simulator, be with the difference of existing terminal scramble testing system, terminal scramble testing system of the present invention also comprises auto-controller, this auto-controller is connected with analyzer, base station simulator and radio-frequency (RF) switch respectively, be used for analyzer, base station simulator and radio-frequency (RF) switch are controlled, comprise the parameter setting, send test command, reception and store test results etc.
Wherein, the path 103 between base station simulator and the radio-frequency (RF) switch, the path 101 between radio-frequency (RF) switch and the analyzer, coaxial cable links to each other with shielding preferably; The special test cable of path 102 usefulness terminals between radio-frequency (RF) switch and the dut terminal links to each other; Terminal is connected with power supply, is used for to the terminal power supply, and power supply links to each other for the terminal power line with path 108 usefulness between the dut terminal, and power supply also is subjected to auto-controller control; Path 104,105,106,107 between auto-controller and analyzer, radio-frequency (RF) switch, base station simulator, the power supply is respectively by gpib interface, and GPIB tests control cable automatically and links to each other.
Described analyzer can be spectrum analyzer, transmitter measuring and analysing meter, signal analyzer etc.
Described radio-frequency (RF) switch also can be the shunt mixer.
Described power supply is digital stabilized voltage power supply.
Fig. 3 is the module map of the auto-controller of terminal scramble testing system of the present invention, and as shown in Figure 3, auto-controller comprises that calibration module, parameter are provided with module, test module, logging modle.
Wherein, calibration module is used to measure the pad value of radio frequency path, and this pad value is written to respectively in analyzer and the base station simulator;
Parameter is provided with module and is used for other instruments of terminal scramble testing system are carried out the initial parameter setting;
Test module is used for sending test command to other instruments of terminal scramble testing system, and reads the test result that these instruments return, and test result is sent to logging modle;
Logging modle is used to write down the test result that test module sends.
Method of testing process below with reference to accompanying drawing 2～5 explanations terminal scramble testing system of the present invention.
Connect each testing equipment according to Fig. 2.Terminal can not started shooting earlier.With base station simulator, analyzer, radio-frequency (RF) switch is opened, and preheating 30 minutes is so that allow the instrument working stability;
Storage needs all frequency ranges and the voltage of test in the logging modle of auto-controller.
All frequency ranges that need test are to be positioned at terminal transmitter frequency range centre frequency 4MHz each frequency range in addition.
The voltage that need test is generally got high, normal, basic three different magnitudes of voltage according to the voltage range of terminal works and is tested.Such as 4.2V, 3.8V and 3.6V etc.
1) auto-controller is tested the pad value of each radio frequency path, and this pad value is write base station simulator and analyzer respectively.
Fig. 4 is the flow chart of the calibration process of terminal scramble method of testing of the present invention, and concrete steps are as follows:
11) auto-controller sends GPIB test control command, test access pad value to analyzer and base station simulator;
111) auto-controller is provided with the frequency and the performance number of the radiofrequency signal of base station simulator transmission to base station simulator and analyzer transmitting control commands, and the test frequency range of analyzer;
Auto-controller is tested control cable automatically by gpib interface and GPIB and is sent the GPIB order to base station simulator and analyzer, and the output frequency of base station simulator is set to the intermediate frequency of institute's frequency measurement section, and power output is set to-30dBm; The test frequency range of analyzer is set to institute's frequency measurement section.
Institute's frequency measurement section is first frequency range that storage needs test in the logging modle of auto-controller.
When test frequency scope during greater than 1GHz, for 2 frequencys multiplication of dut terminal transmitter operating frequency, 3 frequency multiplication equifrequent points want emphasis to calibrate.
Gpib interface can be selected the PCMCIA-GPIB+ model for use.
The GPIB order that auto-controller is provided with the frequency of base station simulator is: CALL::CHANel;
The GPIB order that auto-controller is provided with the power of base station simulator is: CALL::POWEr.
112) power of the radiofrequency signal sent of analyzer testing base station simulator obtains the pad value of each path;
1121) path between testing radio frequency switch and the analyzer 101, path 103 these two pad values that path is total between base station simulator and the radio-frequency (RF) switch;
Auto-controller is tested control cable automatically by gpib interface and GPIB and is sent the GPIB order to base station simulator, base station simulator and dut terminal is set up called out;
Setting up the GPIB order of calling out is: CALL::ORIGinate;
Analyzer receives and measures the radiofrequency signal that base station simulator sends by radio-frequency (RF) switch;
Auto-controller obtains radiofrequency signal power from analyzer;
Auto-controller from the GPIB order that analyzer obtains test result is:
SendCmdReadBuf。
The output radiofrequency signal power of base station simulator is deducted the radiofrequency signal power that analyzer records, obtain 101 and 103 two radio frequency paths and the pad value of the port that is attached thereto.
1122) pad value of test 101,102,103 paths;
Auto-controller is tested control cable automatically by gpib interface and GPIB and is sent the power output that the GPIB order is provided with base station simulator to base station simulator.
Auto-controller sends the GPIB order, the control radio-frequency (RF) switch, the output port of base station simulator is communicated with input port, because base station simulator both can be used as signal generating Instrument and also can be used as signal analyzer or spectrum analyzer, when the output port of base station simulator with after input port is communicated with, base station simulator is as signal analyzer or spectrum analyzer, therefore, records the power output of radiofrequency signal after through 103 paths by the input port of base station simulator;
The performance number that the base station simulator input port is recorded deducts the output power value that base station simulator is provided with, and obtains the pad value of 103 paths;
The pad value of calibrating for the first time 101 and 103 paths deducts the pad value that the pad value of 103 paths for the second time obtains 101 paths;
102 path attenuation value directly according to the specifications of cable given be worth.
Also dut terminal can be connected with auto-controller by the USB line, by the parameter of auto-controller module is set and directly sends the proprietary order of terminal to terminal by the USB line, directly obtain the transmitting power of terminal, then, deduct the input power of base station simulator with the transmitting power of terminal, obtain the pad value of 102 and 103 paths; Deduct the input power of analyzer with the transmitting power of terminal, obtain the pad value of 101 and 102 paths.
12) auto-controller is written to the pad value of 101 and 102 paths in the analyzer by different GPIB orders, and the pad value of 102 and 103 paths is written in the base station simulator.
The GPIB order that auto-controller is provided with the analyzer pad value is: SetRefInputAtten;
The GPIB order that auto-controller is provided with the base station simulator pad value is:
SYStem::CORRection::GAIN。
Fig. 5 is the flow chart of terminal scramble method of testing of the present invention, and concrete steps are as follows:
2) auto testing instrument sends the initialization control command to analyzer, base station simulator, power supply and terminal, and analyzer, base station simulator, power supply and terminal are carried out the initial parameter setting.
The parameter of auto-controller is provided with module and sends the power that the base station simulator output signal is set in the GPIB order by test control cable automatically by gpib interface and GPIB, frequency, incoming frequency scope, reference level and the resolution bandwidth of analyzer, the power source voltage value, the maximum transmission power of terminal etc.;
The power output that the module base station simulator can be set by the parameter of auto-controller that is provided with to the maximum transmission power of terminal is set to when the terminal emission maximum transmission power power output of base station simulator and (104dBm/1.23MHz), comes control terminal output maximum transmission power by base station simulator; Also dut terminal can be connected with auto-controller by the USB line, by the parameter of auto-controller module be set and directly send the proprietary order of terminal, terminal output maximum transmission power is set to terminal by the USB line.
The power source voltage value in the logging modle of auto-controller, first magnitude of voltage that need test that at first is set to here store in the logging modle.
Initialization GPIB order is: InitData;
The GPIB order that the analyzer frequency range is set is: SetSpanFreq;
The GPIB order that the spectrum analysis reference level is set is: SetRefLvlOffset.
3) after auto testing instrument confirms that parameter initialization is finished, send out the test control command to analyzer, base station simulator, power supply, terminal and radio-frequency (RF) switch and test, and test result is returned auto testing instrument;
31) test module of auto-controller control base station simulator is set up and is called out connection;
Base station simulator is set up the GPIB order of calling out: CALL::ORIGinate.
32) test module of auto-controller is tested control cable automatically by gpib interface and GPIB and is sent GPIB order, first the frequency range value that need test that the output frequency range of base station simulator is set to store in the logging modle to base station simulator;
33) test module of auto-controller is tested control cable automatically by gpib interface and GPIB and is sent out the GPIB control command, the conducting of control radio-frequency (RF) switch;
34) test module of auto-controller is tested control cable automatically by gpib interface and GPIB and is sent GPIB order, control analysis instrument read test result to analyzer.
The test result that analyzer reads is: maximum power value is directly obtained by analyzer.
The test module of auto-controller from the GPIB order that analyzer obtains the test pattern interface is:
MEMory:STORe:SCReen<‘file_ame’>；
Repeated execution of steps 32) to 34), finish until all frequency range tests.
4) auto testing instrument records logging modle with the test result that analyzer returns.
The logging modle of auto-controller is written to test result in the text document, and text document is saved in the access path that sets in advance.
In order in report, to provide the test result of visualization, also need to grasp the frequency spectrum graphics of each frequency range of analyzer test, so that provide the test result of visualization in report, auto-controller is by GPIB order carrying out grabgraf:
This order is: MEMory:STORe:SCReen＜' file_name ' 〉.
The logging modle of auto-controller is saved in corresponding catalogue with the grabgraf result with the form of graphic file.
Repeated execution of steps 2) to 4), finish until all supply voltage value tests.
Described analyzer can be a spectrum analyzer, transmitter tester or signal analyzer.
Auto-controller also can be realized by serial ports the control of analyzer, radio-frequency (RF) switch, base station simulator and power supply.
The software design of auto-controller is the TT﹠C system special-purpose software platform LabWindows/CVI of America NI company with the realization software development environment.LabW indows/CVI is a kind of object-oriented visual programmed environment, is core with ANSIC, based on various built-in functions, for instrument is controlled, test and data acquisition etc. provide development platform automatically.
Terminal scramble testing system of the present invention can also connect a plurality of analyzers, carry out the test of a plurality of frequency ranges simultaneously, concrete grammar is as follows: according to the test frequency area requirement a plurality of analyzers are set to different frequency ranges respectively, and corresponding reference power level and resolution bandwidth.Read the test result and the figure of each analyzer during test respectively; Test to each frequency range is identical to the described test process of step 4) with step 1), does not repeat them here.
Compare with single analyzer and to utilize a plurality of analyzers tests can in the shorter time, obtain the test result and the resolution chart of a plurality of different frequency ranges, further improve testing efficiency.
The beneficial effect of terminal scramble testing system of the present invention and method is:
1. improved the outer spuious testing efficiency of band;
2. both can preserve the result of test automatically,, also can grasp the figure of test result automatically, as networking and the report of authentication test as the conclusion that whether satisfies standard-required;
3. have extensibility, can control, realize concurrent testing, further improve testing efficiency many analyzers.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (13)
1. a terminal scramble testing system comprises analyzer, base station simulator, it is characterized in that, also comprises auto-controller, and described auto-controller is connected with base station simulator, to the base station simulator transmitting control commands, makes base station simulator produce radiofrequency signal; Described auto-controller is connected with analyzer, to the analyzer transmitting control commands, from analyzer read test result.
2. terminal scramble testing system as claimed in claim 1, it is characterized in that, also comprise radio-frequency (RF) switch, described radio-frequency (RF) switch links to each other with analyzer, base station simulator and auto-controller respectively, auto-controller is to the radio-frequency (RF) switch transmitting control commands, the break-make of the path of control radio-frequency (RF) switch and base station simulator and the path of radio-frequency (RF) switch and analyzer.
3. terminal scramble testing system as claimed in claim 2 is characterized in that, described radio-frequency (RF) switch is the shunt mixer.
4. terminal scramble testing system as claimed in claim 1 or 2 is characterized in that, described auto-controller comprises that parameter is provided with module, test module and logging modle, wherein,
Parameter is provided with module and is used for other instruments of terminal scramble testing system are carried out the initial parameter setting;
Test module is used for sending test command to other instruments of terminal scramble testing system, and reads the test result of these instruments, and test result is sent to logging modle;
Logging modle is used to write down the test result that test module sends.
5. terminal scramble testing system as claimed in claim 4 is characterized in that described auto-controller also comprises calibration module, is used to measure the pad value of radio frequency path, and this pad value is written to respectively in analyzer and the base station simulator.
6. terminal scramble testing system as claimed in claim 2 is characterized in that, also comprises gpib interface, and described auto-controller is connected with analyzer, base station simulator and radio-frequency (RF) switch by gpib interface.
7. terminal scramble testing system as claimed in claim 1 or 2 is characterized in that, described analyzer is spectrum analyzer, transmitter measuring and analysing meter, signal analyzer.
8. terminal scramble method of testing may further comprise the steps:
Steps A, auto testing instrument is tested to analyzer and base station simulator transmission test control command, and test result is returned auto testing instrument;
Step B, the test result that the auto testing instrument recorder analyser returns.
9. terminal scramble method of testing as claimed in claim 8 is characterized in that, also comprises initialization step before steps A:
A0, auto testing instrument sends the initialization control command to analyzer and base station simulator, and analyzer and base station simulator are carried out the initial parameter setting.
10. terminal scramble method of testing as claimed in claim 9, it is characterized in that described initial parameter is power, the frequency of base station simulator output signal, incoming frequency scope, reference level and the resolution bandwidth of analyzer, the power source voltage value, the maximum transmission power of terminal.
11. terminal scramble method of testing as claimed in claim 10 is characterized in that, the maximum transmission power of described terminal by auto testing instrument by the base station simulator setting, or by auto testing instrument directly to the terminal setting.
12. terminal scramble method of testing as claimed in claim 8 is characterized in that, and is further comprising the steps of before the described steps A:
Steps A 1, auto-controller sends test control command, test access pad value to analyzer and base station simulator;
Steps A 2, auto-controller is provided with control command to an analyzer and a base station simulator transmission parameter, and the path attenuation value is write base station simulator and analyzer.
13., it is characterized in that described control command is the GPIB control command as the described terminal scramble method of testing of claim 8 to 12.
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| CN104767576B (en) * | 2015-04-29 | 2017-03-22 | 西北工业大学 | Automatic testing method for radio frequency signal power and stray |
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| CN108768552A (en) * | 2018-05-30 | 2018-11-06 | 中国电力科学研究院有限公司 | A kind of spuious test method of 1800M RF consistencies transmitter and device |
| CN110417492A (en) * | 2019-08-12 | 2019-11-05 | 太仓市同维电子有限公司 | A kind of detection aerial band is interior to receive spuious method |
| CN110417492B (en) * | 2019-08-12 | 2021-09-07 | 太仓市同维电子有限公司 | Method for detecting in-band received spurious signals of antenna |
| CN111077815A (en) * | 2019-11-27 | 2020-04-28 | 成都芯通软件有限公司 | Compensation system and method for multi-band HFC (hybrid fiber coaxial) equipment with automatically tunable output level |
| CN112019222A (en) * | 2020-09-01 | 2020-12-01 | 上海龙旗科技股份有限公司 | Stray radiation testing method and system for transmitter |
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