CN202406116U - Device for controlling bidirectional radio frequency signals - Google Patents
Device for controlling bidirectional radio frequency signals Download PDFInfo
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- CN202406116U CN202406116U CN2011205659411U CN201120565941U CN202406116U CN 202406116 U CN202406116 U CN 202406116U CN 2011205659411 U CN2011205659411 U CN 2011205659411U CN 201120565941 U CN201120565941 U CN 201120565941U CN 202406116 U CN202406116 U CN 202406116U
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- microwave radio
- filter
- radio signaling
- switch
- signaling switch
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Abstract
The utility model relates to a device for controlling bidirectional radio frequency signals. A first microwave radio frequency signal switch, a bypass module, a first filter, an amplifier and a grouping device form a full frequency band signal downlink path; after a second microwave radio frequency signal switch is connected with a second filter in sequence, the second microwave radio frequency signal switch, the second filter, the amplifier and the grouping device form a first sub-frequency band downlink path between the input end of the first microwave radio frequency signal switch and the output end of the bypass module; after a third microwave radio frequency signal switch is connected with a third filter in sequence, the third microwave radio frequency signal switch and the third filter are connected in parallel with the output end of the amplifier and the input end of the first microwave radio frequency signal switch, and the grouping device, the third microwave radio frequency signal switch and the third filter form a second sub-frequency band uplink path; and the first microwave radio frequency signal switch, the second microwave radio frequency signal switch and the third microwave radio frequency signal switch are controlled to be turned on by a switch, so that the bidirectional radio frequency signals are comprehensively controlled.
Description
Technical field
The invention belongs to the radiofrequency signal process field, be specifically related to a kind of control device of bi-directional RF signal.
Background technology
DVB, the abbreviation of DVB Digital Video Broadcasting is the DTV Open Standard by a series of international recognitions of DVB project maintenance.DVB system transmissions mode has following several kinds: satellite (DVB-S and DVB-S2); Wired (DVB-C); Terrestrial wireless (DVB-T); Hand-held terrestrial wireless (DVB-H).The main distinction of these transmission meanss is the modulation system used, because the requirement of the different frequency bandwidths that their are used is different.Utilize the DVB-S of high frequency carrier to use the QPSK modulation system, utilize the DVB-C of low frequency carrier signal to use the QAM-64 modulation system, and utilize the DVB-T of VHF and UHF carrier wave to use the COFDM modulation system
DVB-S (ETS 300421) is the digital broadcasting satellite system standard.Satellite transmits has characteristics such as broad covered area, program capacity be big.QPSK modulation (QPSK) mode is adopted in the modulation of data flow, and operating frequency is 11/12GHz.When using the MPEG-2MPML form, user side is if reach CCIR 601 studio quality, and code check is 9Mb/s; Reach the PAL quality, code check is 5Mb/s.A 54MHz transponder transfer rate can reach 68Mb/s, can be used for the multiplexing of multiple programs.The DVB-S standard is almost all satellite broadcasting digital television systems and adopts.China has also selected the DVB-S standard for use.DVB-T is writing a Chinese character in simplified form of (DVB-Terrestrial), is called terrestrial wireless, makes terrestrial microwave carry again.DVB-S is writing a Chinese character in simplified form of (DVB-Cable), is called the coaxial cable carrier wave wireless, makes coaxial cable carrier wave microwave carry again.At present in the satellite direct-seeding TV system of countries in the world; ((common signal frequency of utilization scope: 47MHz～862MHz also has signal combination that some areas have been applied to 5MHz～862MHz) and distributes in the control for actual respective frequencies scope: 950MHz～2450MHz) and DVB-T system generally to adopt many satellite RFs signal shift switch to use the DVB-S system.(+HFC) the continuous expansion of system product value-added service, video request program (VOD, i.e. radiofrequency signal circuit passback) function is used more and more widely in countries in the world along with DVB-C in recent years.Because it is the upload frequencies scope that video request program is used is 5-65MHZ, that the frequency of utilization section frequency of occurrences of inevitable and DVB-T system is overlapping.Current at present solution is to select parallel transmission; But because the loss of downlink radio-frequency signal in coaxial cable of DVB-T system is bigger; Usually must be by many satellite RFs signal shift switch; Perhaps, provide the compensate function that increases signal gain could satisfy follow-up signal transmission, instructions for use arbitrarily with the equipment of node.Just because of the signal gain of the signal gain compensating circuit in the circuit to the DVB-T downstream signal; Partly form forward and reverse feed circulation amplification and cause the unbalance of amplifying unit circuit at DVB-T and DVB-C frequency overlap; Cause the phenomenon of system signal self-excitation often; Make to occur irregular fluctuation in the radio signal transmission, influence signal quality.
Summary of the invention
The objective of the invention is to overcome the defective of prior art; A kind of control device of bi-directional RF signal is provided; The compatible forward DVB-T of this control device system descending radiofrequency signal and the reverse DVB-C (+HFC) parallel transmission of system product value-added service video on-demand function radiofrequency signal, and the system signal self-excitation problem that can avoid two-way feed circulation amplification to cause.
Realize that the object of the invention technical scheme is: the control device of bi-directional RF signal, form full frequency band signal downlink path by the first microwave radio signaling switch, bypass module, first filter, amplifier and burster; The second microwave radio signaling switch is with after second filter is connected successively; Between the output of the first microwave radio signaling switch input and bypass module, the second microwave radio signaling switch, second filter, amplifier and burster are formed the first frequency-division section downlink; The 3rd microwave radio signaling switch is connected in parallel on the said amplifier out and the first microwave radio signaling switch input with after the 3rd filter is connected successively, and burster, the 3rd microwave radio signaling switch and the 3rd filter are formed the second frequency-division section uplink; The first microwave radio signaling switch, the second microwave radio signaling switch and the 3rd microwave radio signaling switch are through diverter switch control conducting; Diverter switch have two kinds of location statuss; When 1: the first microwave radio signaling switch in position was opened, the second microwave radio signaling switch and the 3rd microwave radio signaling switch were closed; 2: the second microwave radio signaling switches in position and the 3rd microwave radio signaling switch are opened, and the first microwave radio signaling switch is closed; Under 1 state of position, the conducting of said full frequency band signal downlink path, the full frequency band signal is successively through the first microwave radio signaling switch, first filter, amplifier, exports to burster; Under 2 states of position; The said first frequency-division section uplink and the second frequency-division section downlink conducting; The first frequency-division section signal is successively through the second microwave radio signaling switch, second filter, amplifier; To burster output, simultaneously, the second frequency-division section signal is successively through burster, the 3rd microwave radio signaling switch and the output of the 3rd filter.
In the technique scheme, the microwave radio signaling switch is set in many satellite RFs signal shift switch, the transmission range of control signal is controlled the switching of radiofrequency signal control switch through diverter switch, so the path of control return path signal with open circuit.
Said first, second preferably adopts pin diode switch with the 3rd microwave radio signaling switch, through the break-make characteristic of each PIN diode electric current of diverter switch control, is combined into path that the radiofrequency signal control switch controls the return path signal and opens circuit.When stirring the diverter switch selection path, make and satisfy certain electric current in the PIN diode and pass through, the conducting PIN diode makes radiofrequency signal to pass through, and when toggle switch is selected to open circuit, does not have overcurrent, and PIN diode blocking-up radiofrequency signal can not be passed through.
The frequency range of said first filter is 5-862MHZ, and the frequency range of said second filter is 87-862MHZ, and the frequency range of said the 3rd filter is 5-65MHZ.Forward DVB-T system descending radiofrequency signal is that the forward feed of system has two signal paths, and first is 5-862MHZ, and another is that the 87-862MHZ signal path is blocked in filtering.With DVB-C (+HFC) the up feed signal filtering of system becomes the signal path of 5-65MHZ.Like this; When the toggle switch selection path; The 87-862MHZ radiofrequency signal that can control forward DVB-T system descending simultaneously and reverse DVB-C (+HFC) the 5-65MHZ signal path of system uplink; When stirring diverter switch when selecting to open circuit, the path of control forward DVB-T system descending full frequency band signal 5-862MHZ.Like this through the 87-862MHZ DVB-T system descending radiofrequency signal of signal gain amplifying circuit and 5-65MHz DVB-C (+HFC) the system uplink signal does not just have and conflicts, and has realized the Comprehensive Control of bi-directional RF signal.This invention makes many satellite RFs signal shift switch can compatible with DVB-S system and DVB-T system; Also can compatible with DVB-C (+HFC) system; Promptly applicable to DVB-S+DVB-T+DVB-C (+HFC) hybrid network; Make the application of product in system more flexible, the input of other corollary equipments is still less saved system's cost of investment.
Beneficial effect of the present invention is:
(1) provides that (+HFC) the solution of the parallel transmission of system product value-added service video on-demand function radiofrequency signal avoids two-way feed circulation to amplify the system's self-excitation problem that causes to forward DVB-T signal system downlink radio-frequency signal and reverse DVB-C;
(2) this invention makes many satellite RFs signal shift switch can compatible with DVB-S system and DVB-T system; Also can compatible with DVB-C (+HFC) system; Promptly applicable to DVB-S+DVB-T+DVB-C (+HFC) hybrid network; Make the application of product in system more flexible, the input of other corollary equipments is still less saved system's cost of investment.
Description of drawings
Fig. 1 is the structural representation of control device of the bi-directional RF signal of the embodiment of the invention 1.
Among the figure: the control device of 1-first pin diode switch, 2-bypass module, 3-first filter, 4-amplifier, 5-burster, 6-second pin diode switch, the 7-second filter 8-the 3rd pin diode switch, 9-the 3rd filter, 10-bi-directional RF signal.
Embodiment
Further specify below in conjunction with embodiment and accompanying drawing.
As shown in Figure 1, the control device 10 of bi-directional RF signal is formed full frequency band signal downlink path by first pin diode switch 1, bypass module 2, first filter 3, amplifier 4 and burster 5; Second pin diode switch 6 is with after second filter 7 is connected successively; Be connected in parallel between the output of first pin diode switch, 1 input and bypass module 2, second pin diode switch 6, second filter 7, amplifier 4 and burster 5 are formed the first frequency-division section downlink; The 3rd pin diode switch 8 is connected in parallel between amplifier 4 outputs and first pin diode switch, 1 input with after the 3rd filter 9 is connected successively, and burster 5, the 3rd pin diode switch 8 and the 3rd filter 9 are formed the second frequency-division section uplink.Wherein, the frequency range of first filter is 5-862MHZ, and the frequency range of second filter is 87-862MHZ, and the frequency range of the 3rd filter is 5-65MHZ.
First pin diode switch 1, second pin diode switch 6 and the 3rd pin diode switch 8 are through diverter switch control conducting; Diverter switch have two kinds of location statuss; As shown in table 1; When 1: the first pin diode switch in position 1 was opened, second pin diode switch 6 and the 3rd pin diode switch 8 were closed; 2: the second pin diode switches 6 in position and the 3rd pin diode switch 8 are opened, and first pin diode switch 1 is closed; Under 1 state of position, the conducting of full frequency band signal downlink path, the full frequency band signal is successively through first pin diode switch 1, bypass module 2, first filter 3, amplifier 4, to burster 5 output 5-862MHZ radiofrequency signals; Under 2 states of position; The first frequency-division section uplink and the second frequency-division section downlink conducting; The first frequency-division section signal is successively through second pin diode switch 6, second filter 7, amplifier 4; To burster 5 output 87-862MHZ radiofrequency signals, simultaneously, the second frequency-division section signal is successively through burster 5, the 3rd pin diode switch 8 and the 3rd filter 9 output 5-65MHZ radiofrequency signals.
Table 1
Select the combination of SS12F09 type toggle switch that Dongguan City three grand Electronics Co., Ltd.s produce in the present embodiment, realize the break-make of signal as diverter switch and first, second and the 3rd PIN diode.The break-make characteristic of microwave toggle switch control PIN diode electric current is combined into path that the radiofrequency signal control switch controls the return path signal and opens circuit.During the toggle switch selection path, make and satisfy certain electric current in the PIN diode and pass through, the conducting PIN diode makes radiofrequency signal to pass through, and when toggle switch is selected to open circuit, does not have overcurrent, and PIN diode blocking-up radiofrequency signal can not be passed through.
Claims (3)
1. the control device of bi-directional RF signal is characterized in that, this device is formed full frequency band signal downlink path by the first microwave radio signaling switch, bypass module, first filter, amplifier and burster; The second microwave radio signaling switch is with after second filter is connected successively; Between the output of the first microwave radio signaling switch input and bypass module, the second microwave radio signaling switch, second filter, amplifier and burster are formed the first frequency-division section downlink; The 3rd microwave radio signaling switch is connected in parallel on the said amplifier out and the first microwave radio signaling switch input with after the 3rd filter is connected successively, and burster, the 3rd microwave radio signaling switch and the 3rd filter are formed the second frequency-division section uplink; The first microwave radio signaling switch, the second microwave radio signaling switch and the 3rd microwave radio signaling switch are through diverter switch control conducting; Diverter switch have two kinds of location statuss; When 1: the first microwave radio signaling switch in position was opened, the second microwave radio signaling switch and the 3rd microwave radio signaling switch were closed; 2: the second microwave radio signaling switches in position and the 3rd microwave radio signaling switch are opened, and the first microwave radio signaling switch is closed; Under 1 state of position, the conducting of said full frequency band signal downlink path, the full frequency band signal is successively through the first microwave radio signaling switch, first filter, amplifier, exports to burster; Under 2 states of position; The said first frequency-division section uplink and the second frequency-division section downlink conducting; The first frequency-division section signal is successively through the second microwave radio signaling switch, second filter, amplifier; To burster output, simultaneously, the second frequency-division section signal is successively through burster, the 3rd microwave radio signaling switch and the output of the 3rd filter.
2. the control device of bi-directional RF signal according to claim 1 is characterized in that, said first, second adopts pin diode switch with the 3rd microwave radio signaling switch.
3. the control device of bi-directional RF signal according to claim 1 is characterized in that, the frequency range of said first filter is 5-862MHZ, and the frequency range of said second filter is 87-862MHZ, and the frequency range of said the 3rd filter is 5-65MHZ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205659411U CN202406116U (en) | 2011-12-30 | 2011-12-30 | Device for controlling bidirectional radio frequency signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205659411U CN202406116U (en) | 2011-12-30 | 2011-12-30 | Device for controlling bidirectional radio frequency signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202406116U true CN202406116U (en) | 2012-08-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205659411U Expired - Lifetime CN202406116U (en) | 2011-12-30 | 2011-12-30 | Device for controlling bidirectional radio frequency signals |
Country Status (1)
| Country | Link |
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| CN (1) | CN202406116U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102523061A (en) * | 2011-12-30 | 2012-06-27 | 江苏苏美达机电有限公司 | Two-way radio-frequency signal control device |
-
2011
- 2011-12-30 CN CN2011205659411U patent/CN202406116U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102523061A (en) * | 2011-12-30 | 2012-06-27 | 江苏苏美达机电有限公司 | Two-way radio-frequency signal control device |
| CN102523061B (en) * | 2011-12-30 | 2018-06-15 | 江苏苏美达机电有限公司 | The control device of two-way radio-frequency signal |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120829 |