CN104734790A - Method for calculating the attenuation of radio-frequency signals of different frequencies in radio frequency transmission cable - Google Patents
Method for calculating the attenuation of radio-frequency signals of different frequencies in radio frequency transmission cable Download PDFInfo
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- CN104734790A CN104734790A CN201310696708.0A CN201310696708A CN104734790A CN 104734790 A CN104734790 A CN 104734790A CN 201310696708 A CN201310696708 A CN 201310696708A CN 104734790 A CN104734790 A CN 104734790A
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- transmission cable
- radio frequency
- frequency transmission
- attenuation
- radio
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Abstract
A calculating method is capable of calculating the attenuation values of different frequencies in the same section of radio frequency transmission cable. By using the principle that the attenuation value of a fixed frequency in a radio frequency transmission cable is fixed, the length of a radio frequency transmission cable can be calculated, and then, the actual attenuation values of the radio frequency transmission cable at different frequencies can be calculated according to different per-meter nominal attenuation values of different frequencies in the radio frequency transmission cable, thus providing reference values for subsequent attenuation compensation of the radio frequency transmission cable.
Description
Art
The present invention relates to a kind of method calculating different frequency radiofrequency signal and decay at radio-frequency transmission line cable, tested radio frequency transmission cable length can be measured by the attenuation of fixed frequency radiofrequency signal, then go out the pad value of different frequency signals in this section of RF cable by formulae discovery.
Background technology
At present, in various distributed communication system, there is various radio frequency transmission cable, different radio frequency transmission cables has different pad values in different frequency ranges, now general method is when carrying out project planning, the nominal attenuation value of the required radio frequency transmission cable laid is multiplied with needing the radio frequency transmission cable length laid, obtain the pad value of final radio frequency transmission cable, the pad value that this method calculates, can because the length of radio frequency transmission cable be from different and different during design in practice of construction in the Practical Project laying radio frequency transmission cable.Such as: radio frequency transmission cable length during design is 100 meters, but, employ 120 meters in Practical Project, cause the pad value of 20 meters not calculate in actual decay, finally cause the power output of radio frequency transmission cable to be less than design power output.
Summary of the invention
In order to overcome the deficiency of existing decay computational methods, the invention provides the method for a kind of novel calculating different frequency radiofrequency signal pad value in radio frequency transmission cable, utilize the principle that the pad value of fixed frequency in radio frequency transmission cable is fixing, by measuring the pad value of fixed frequency in one section of radio frequency transmission cable, by the pad value measured divided by radio frequency transmission now under fixed frequency every meter of pad value of nominal just can draw the length of this section of radio frequency transmission cable, again this length is imported in the computing formula of this section of radio frequency transmission cable transmission attenuation value at different frequencies, obtain the pad value that different frequency is actual in this section of radio frequency transmission cable.
The technical solution adopted for the present invention to solve the technical problems is: in one end of radio frequency transmission cable input constant power, the continuous wave of fixed frequency, the power of this frequency is measured at the other end of radio frequency transmission cable, power output is cut again by input power, obtain pad value, again by the every meter nominal attenuation value of the pad value obtained divided by this radio frequency transmission cable, what obtain is exactly the line length of this section of radio frequency transmission cable, being multiplied by by the length of the radio frequency transmission cable obtained needs the every meter nominal attenuation value of radiofrequency signal in this kind of radio frequency transmission cable of input just can obtain the pad value of this frequency in this section of radio frequency transmission cable again, for follow-up attenuation compensation provides reference value.
The invention has the beneficial effects as follows, obtain the Trueattenuation value of required input signal in this section of radio frequency transmission cable by the method, for follow-up automatic attenuation compensation provides parameter, make the design of whole compartment system consistent with the index of practice of construction.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is schematic diagram of the present invention.
Fig. 2 is formula of the present invention.
Fig. 3 is an application example of the present invention.
Accompanying drawing explanation
In FIG, launch the continuous wave (1) of a fixed frequency and constant power, measure the power (2) of this fixed frequency after this section of radio frequency transmission cable, input power under this frequency is deducted power output, calculate the pad value (3) that this section of radio frequency transmission cable is actual under this fixed frequency, inquire about the every meter nominal attenuation value (4) of this radio frequency transmission cable under input fixed frequency, be multiplied actual attenuation value under fixed frequency with every meter of nominal attenuation value of this radio frequency transmission cable the line length (5) obtaining this section of radio frequency transmission cable, inquire about the every meter nominal attenuation value (6) of this radio frequency transmission cable under required input frequency, this radio frequency transmission cable every meter of nominal attenuation value under required input frequency is multiplied by by long for this section of radio frequency transmission cable wire, calculate the pad value (7) that this section of radio frequency transmission cable is actual under this required input frequency.
Claims (2)
1. the method for novel calculating different frequency attenuation in radio frequency transmission cable.
2. it is characterized in that: utilize the principle that the pad value of fixed frequency in radio frequency transmission cable is fixing, by measuring the pad value of fixed frequency in one section of radio frequency transmission cable, the pad value measured just can be drawn the length of this section of radio frequency transmission cable divided by every meter of pad value of nominal, then obtain different frequency pad value actual in this section of radio frequency transmission cable in the computing formula this length being imported to this section of radio frequency transmission cable transmission attenuation value at different frequencies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310696708.0A CN104734790A (en) | 2013-12-18 | 2013-12-18 | Method for calculating the attenuation of radio-frequency signals of different frequencies in radio frequency transmission cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310696708.0A CN104734790A (en) | 2013-12-18 | 2013-12-18 | Method for calculating the attenuation of radio-frequency signals of different frequencies in radio frequency transmission cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104734790A true CN104734790A (en) | 2015-06-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310696708.0A Pending CN104734790A (en) | 2013-12-18 | 2013-12-18 | Method for calculating the attenuation of radio-frequency signals of different frequencies in radio frequency transmission cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104734790A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5111611B2 (en) * | 2009-02-16 | 2013-01-09 | 株式会社フジクラ | Transmission cable |
| CN202772247U (en) * | 2012-09-18 | 2013-03-06 | 南京广顺网络通信设备有限公司 | Linear coaxial load |
-
2013
- 2013-12-18 CN CN201310696708.0A patent/CN104734790A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5111611B2 (en) * | 2009-02-16 | 2013-01-09 | 株式会社フジクラ | Transmission cable |
| CN202772247U (en) * | 2012-09-18 | 2013-03-06 | 南京广顺网络通信设备有限公司 | Linear coaxial load |
Non-Patent Citations (1)
| Title |
|---|
| 刘化君: "《综合布线系统》", 31 July 2004, 机械工业出版社 * |
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| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150624 |